Relevant bibliographies by topics / Alloy nucleation study][Lead nucleation

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Alloy nucleation study][Lead nucleation'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Alloy nucleation study][Lead nucleation.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Alloy nucleation study][Lead nucleation"

1

Libera, Matthew R. "AEM analysis of solidification catalysts in atomized Fe-Ni." Proceedings, annual meeting, Electron Microscopy Society of America 44 (August 1986): 584–85. http://dx.doi.org/10.1017/s0424820100144395.

Full text
Abstract:
The liquid droplets produced by atomization processes are believed to undergo substantial supercooling during solidification, because the catalytic heterogeneities, for statistical reasons, tend to be isolated in the larger droplets. This supercooling can lead to the nucleation of metastable phases. As part of a study on the effect of liquid supercooling on nonequilibrium solidification, three binary Fe-Ni alloys have been produced by conventional argon atomization (Fe-20Ni, Fe-30Ni, and Fe-40Ni). The primary variables in these experiments are: i) the alloy composition; and ii) the powder particle diameter (inversely proportional to supercooling). Of particular interest in this system is the competitive nucleation kinetics between the stable fee and metastable bec phases. Bcc is expected to nucleate preferentially with decreasing %Ni and decreasing particle diameter.
APA, Harvard, Vancouver, ISO, and other styles
2

Wang, Zhi Gang, Jun Xu, Bao Li, and Zhi Feng Zhang. "Study on Refinement Mechanism of Sc and Zr as-Cast Al-7.2Zn-2.2Mg-1.8Cu Alloys." Applied Mechanics and Materials 372 (August 2013): 66–69. http://dx.doi.org/10.4028/www.scientific.net/amm.372.66.

Full text
Abstract:
The effect of trace Sc and Zr on grain refinement of Al-7.2Zn-2.2Mg-1.8Cu as-cast ingot was studied by using optical microscopy and scanning electron microscopy with EDS. The results show that addition of only 0.20% Zr or 0. 20% Sc to Al-7.2Zn-2.2Mg-1.8Cu alloy can refine grains to a certain degree, and the addition of 0.10% Sc+0.20%Zr leads to stronger grain refinement, the average grain size is only 10-15μm. Al3Sc/Al3Zr composite particles in the melt work as the nucleation of heterogeneous nucleation during solidification.
APA, Harvard, Vancouver, ISO, and other styles
3

Kooi, Bart J., R. Pandian, J. Th M. De Hosson, and Andrew Pauza. "In situ Transmission Electron Microscopy Study of the Crystallization of Fast-growth Doped SbxTe Alloy Films." Journal of Materials Research 20, no. 7 (July 1, 2005): 1825–35. http://dx.doi.org/10.1557/jmr.2005.0228.

Full text
Abstract:
Crystallization of amorphous thin films composed of doped SbxTe with x = 3.0, 3.6, and 4.2 and constant dopant level was studied by in situ heating in a transmission electron microscopy. Magnetron sputtering was used to deposit 20-nm-thick films sandwiched between two types of 3-nm-thick dielectric layers on 25-nm-thick silicon-nitride membranes. One type of dielectric layer consists of ZnS–SiO2 (ZSO), the other of GeCrN (GCN). Crystallization was studied for temperatures in-between 150 and 190 °C. The type of dielectric layer turned out to strongly influence the crystallization process. Not only did the nucleation rate appear to depend sensitively on the dielectric layer type, but also the growth rate. The velocity of the crystalline/amorphous interface is about 5 times higher for the x = 4.2 film than for the x = 3.0 film if ZSO is used. In case of GCN, the interface velocity is about 2 times higher for the x = 4.2 film than for the x = 3.0 film. The activation energy for crystal growth is not significantly dependent on the Sb/Te ratio but is clearly different for ZSO and GCN—2.9 eV and 2.0 eV, respectively. The incubation time for the crystal nuclei formation is longer for ZSO than for GCN. Although the effects of the Sb/Te ratio and the dielectric layer type on the growth rates are strong, their effects on the nucleation rate are even more pronounced. A higher Sb/Te ratio results in a lower nucleation rate and the use of GCN instead of ZSO leads to higher nucleation rates.
APA, Harvard, Vancouver, ISO, and other styles
4

Liu, Han Min, Jie Cheng, Yue Hua Wen, Jun Li Pan, and Gao Ping Cao. "Study of Substrate for the Zinc Electrode in Acid Zn-PbO2 Flow Battery." Applied Mechanics and Materials 700 (December 2014): 136–40. http://dx.doi.org/10.4028/www.scientific.net/amm.700.136.

Full text
Abstract:
An investigation into the suitability of carbon materials, metallic lead and its alloys as substrates for the zinc electrode in acid Zn-PbO2 flow batteries was performed. No maximum current appears on the potentiostatic current transients recorded for the zinc deposition on the lead and its alloys. With increasing the overpotential, the progressive nucleation turns to be the 3D-instantaneous nucleation process employed for the resin-graphite composite. Hydrogen evolution on the graphite composite is effectively suppressed due to the doping of polymer resins. The rate of hydrogen evolution reaction on the lead is relatively weak, but on the lead alloys, the hydrogen evolution conversely becomes serious to a certain degree. Though the exchange current density of the zinc deposition and dissolution process on the graphite composite is relatively low, the zinc corrosion is weakened to a great extent. With the increase of deposition time, the zinc deposits tend to be more compact. Zinc galvanostatic charge-discharge cycling on the graphite composite reveals that the coulombic of over 90% can be found, exhibiting an excellent cycling stability.
APA, Harvard, Vancouver, ISO, and other styles
5

Hashim, Aimi Noorliyana, Mohd Arif Anuar Mohd Salleh, Andrei Victor Sandu, Muhammad Mahyiddin Ramli, Khor Chu Yee, Noor Zaimah Mohd Mokhtar, and Jitrin Chaiprapa. "Effect of Ni on the Suppression of Sn Whisker Formation in Sn-0.7Cu Solder Joint." Materials 14, no. 4 (February 5, 2021): 738. http://dx.doi.org/10.3390/ma14040738.

Full text
Abstract:
The evolution of internal compressive stress from the intermetallic compound (IMC) Cu6Sn5 growth is commonly acknowledged as the key inducement initiating the nucleation and growth of tin (Sn) whisker. This study investigates the effect of Sn-0.7Cu-0.05Ni on the nucleation and growth of Sn whisker under continuous mechanical stress induced. The Sn-0.7Cu-0.05Ni solder joint has a noticeable effect of suppression by diminishing the susceptibility of nucleation and growth of Sn whisker. By using a synchrotron micro X-ray fluorescence (µ-XRF) spectroscopy, it was found that a small amount of Ni alters the microstructure of Cu6Sn5 to form a (Cu,Ni)6Sn5 intermetallic layer. The morphology structure of the (Cu,Ni)6Sn5 interfacial intermetallic layer and Sn whisker growth were investigated by scanning electron microscope (SEM) in secondary and backscattered electron imaging mode, which showed that there is a strong correlation between the formation of Sn whisker and the composition of solder alloy. The thickness of the (Cu,Ni)6Sn5 IMC interfacial layer was relatively thinner and more refined, with a continuous fine scallop-shaped IMC interfacial layer, and consequently enhanced a greater incubation period for the nucleation and growth of the Sn whisker. These verification outcomes proposes a scientifically foundation to mitigate Sn whisker growth in lead-free solder joint.
APA, Harvard, Vancouver, ISO, and other styles
6

Wu, Di, and Zhuang Li. "Study on the Machinability of Free Cutting Non-Lead Austenitic Stainless Steels." Advanced Materials Research 430-432 (January 2012): 306–9. http://dx.doi.org/10.4028/www.scientific.net/amr.430-432.306.

Full text
Abstract:
In this paper, a new non-lead machinable austenitic stainless steel was investigated. The metallurgical properties, machinability and mechanical properties of the developed alloy were compared with those of the conventional austenitic stainless steel 321. The results have shown that the presence of machinable additives, such as sulfur, copper and bismuth, etc. contributes to the improvement of the machinability of austenitic stainless steel, because the inclusions are something like internal notches causing crack nucleation and facilitating rupture. Bismuth has a distinct advantage over lead. The machinability of the austenitic stainless steels with free-cutting additives is much better than that of austenitic stainless steel 321. The mechanical properties of the free cutting austenitic stainless steel are similar to those of 321 although the former are slightly lower than those of the latter.
APA, Harvard, Vancouver, ISO, and other styles
7

Zhang, Jiao, Qing Dong, Yong Bing Dai, Bao De Sun, and Hong Lan Xie. "Study of Fragment Behavior during Columnar-Equiaxed Transition of Hypoeutectic Alloy with Synchrotron Radiation." Materials Science Forum 706-709 (January 2012): 1743–48. http://dx.doi.org/10.4028/www.scientific.net/msf.706-709.1743.

Full text
Abstract:
In the present work, solidification of hypoeutectic, eutectic and hypereutectic Al-Cu alloys was illustrated by synchrotron X ray imaging, and the CET of hypoeutectic alloy was picked out to thorough investigated. The mechanism of hypoeutectic dendrites fragment behaviors among the nucleation area was studied by in-situ imaging and first-principles computation. The results show that the density difference between the fragments and the enriched melt leads to the movement of the fragments. The ejected fragments contributed to the columnar-eutectic transition and expanded the breadth of mush zone in front of the solid/liquid interface.
APA, Harvard, Vancouver, ISO, and other styles
8

Sak-Saracino, Emilia, and Herbert M. Urbassek. "The α↔γ transformation of an Fe1−xCrx alloy: A molecular-dynamics approach." International Journal of Modern Physics C 27, no. 10 (August 29, 2016): 1650124. http://dx.doi.org/10.1142/s0129183116501242.

Full text
Abstract:
Using molecular dynamics (MD) simulation, we study the temperature-induced [Formula: see text] phase transformation of an Fe[Formula: see text]Cr[Formula: see text] alloy. We find that the austenitic transition temperature is increased with respect to that of an Fe[Formula: see text]Ni[Formula: see text] alloy containing the same concentration of impurity atoms. During the austenitic transformation, heterogeneous nucleation of close-packed (cp) nuclei leads to a polycrystalline structure. The microstructure formed closely resembles that found in pure Fe and in FeNi alloys.
APA, Harvard, Vancouver, ISO, and other styles
9

HACIOGLU, TUGCE, AYSEN TEZCANER, SHERIF ABBAS, and ZAFER EVIS. "PREPARATION AND CHARACTERISTICS OF CO-DOPED HYDROXYAPATITE BIOMIMETIC COATINGS ON PRETREATED Ti6Al4V ALLOY." Surface Review and Letters 27, no. 11 (August 22, 2020): 2050012. http://dx.doi.org/10.1142/s0218625x20500122.

Full text
Abstract:
In this study, [Formula: see text] co-doped and pure hydroxyapatites (HAp) were coated on rough surfaces of Ti6Al4V plates by biomimetic method. Prepared samples were investigated with SEM, EDS, FTIR, XRD and ICP. Furthermore, mechanical scratch tests, profilometer tests and in vitro cell studies were carried out. In order to explore the antibacterial characteristics of the coating, the survival rate of a bacteria named Staphylococcus epidermidis was determined. Structural investigations showed that HAp nucleation began four days after the immersion, expectedly nucleation developed collaterally with the incubation period and co-dopants had considerable effect on surface characteristics. Besides, the pretreatment procedure and dopants had notable impact on mechanical qualifications of the coatings. The critical load values obtained for coating failure were detected above 100[Formula: see text]mN in all types of coatings (max. critical load was obtained from 0.3[Formula: see text]mM co-doped coatings). Cancerous bone cells (SaOS-2) on prepared coatings were evaluated in terms of biological properties. 0.1-C7 and 0.3-C7 exhibited highest reduction percentage among all co-doped samples. Further increase in dopants concentrations up to 0.5[Formula: see text]mM lead to increase in toxicity and decrease in cell proliferation. Antibacterial test results showed the most antibacterial samples were 0.1-C7 and 0.3-C7, the results conformed with cell culture findings.
APA, Harvard, Vancouver, ISO, and other styles
10

Michal, G. M., T. K. Glasgow, and T. J. Moore. "Spherulite Structures in a Melt Spun Fe-Ni Austenitic Steel." Proceedings, annual meeting, Electron Microscopy Society of America 43 (August 1985): 52–53. http://dx.doi.org/10.1017/s0424820100117339.

Full text
Abstract:
Large additions of B to Fe-Ni alloys can lead to the formation of an amorphous structure, if the alloy is rapidly cooled from the liquid state to room temperature. Isothermal aging of such structures at elevated temperatures causes crystallization to occur. Commonly such crystallization pro ceeds by the nucleation and growth of spherulites which are spherical crystalline bodies of radiating crystal fibers. Spherulite features were found in the present study in a rapidly solidified alloy that was fully crysstalline as-cast. This alloy was part of a program to develop an austenitic steel for elevated temperature applications by strengthening it with TiB2. The alloy contained a relatively large percentage of B, not to induce an amorphous structure, but only as a consequence of trying to obtain a large volume fracture of TiB2 in the completely processed alloy. The observation of spherulitic features in this alloy is described herein. Utilization of the large range of useful magnifications obtainable in a modern TEM, when a suitably thinned foil is available, was a key element in this analysis.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Alloy nucleation study][Lead nucleation"

1

Moore, K. I. "Heterogeneous nucleation of solidification in an Al-Pb alloy." Thesis, University of Oxford, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.376935.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Young, Adam Hamilton. "Study of the Nucleation Mechanism of a-Ti in Bimodal and Fully Lamellar Microstructures Developed in the High-Strength, Near-Beta Titanium Alloy, TIMETAL®18." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1374159274.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Desnain, Philippe. "Influence de la convection sur la taille de grains de solidification d'alliages industriels d'aluminium." Grenoble INPG, 1989. https://hal.archives-ouvertes.fr/tel-01338778.

Full text
Abstract:
Etude de la formation de la structure de grains lors de la solidification d'alliages industriels d'aluminium. Enregistrement des courbes de refroidissement et examen des phenomenes de recalescence lors de la solidification dans une lingotiere rectangulaire verticale munie d'un brasseur electromangetiques a champ glissant. Caracterisation des lingots et mesures de la taille des grains equiaxes. Modelisation de la nucleation et de la croissance des cristaux equiaxes. Influence du brassage et de la composition. Prevision a partir du modele etabli de l'affinement des grains resultant du brassage
APA, Harvard, Vancouver, ISO, and other styles

Book chapters on the topic "Alloy nucleation study][Lead nucleation"

1

Wang, Yunkai, and Jianzhong Li. "Study of the Effect of the Initial Nucleation Mechanism of Lead Anode Oxidation Film on Internal Stress in Chromic Acid Electrolyte." In Characterization of Minerals, Metals, and Materials 2017, 515–25. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-51382-9_56.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Zolnikov, Konstantin P., Dmitrij S. Kryzhevich, and Aleksandr V. Korchuganov. "Regularities of Structural Rearrangements in Single- and Bicrystals Near the Contact Zone." In Springer Tracts in Mechanical Engineering, 301–22. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-60124-9_14.

Full text
Abstract:
AbstractThe chapter is devoted to the analysis of the features of local structural rearrangementsin nanostructured materialsunder shear loadingand nanoindentation. The study was carried out using molecular dynamics-based computer simulation. In particular, we investigated the features of symmetric tilt grain boundary migration in bcc and fcc metals under shear loading. The main emphasis was on identifying atomic mechanisms responsible for the migration of symmetric tilt grain boundaries. We revealed that grain boundaries of this type can move with abnormally high velocities up to several hundred meters per second. The grain boundary velocity depends on the shear rate and grain boundary structure. It is important to note that the migration of grain boundary does not lead to the formation of structural defects. We showed that grain boundary moves in a pronounced jump-like manner as a result of a certain sequence of self-consistent displacements of grain boundary atomic planes and adjacent planes. The number of atomic planes involved in the migration process depends on the structure of the grain boundary. In the case of bcc vanadium, five planes participate in the migration of the Σ5(210)[001] grain boundary, and three planes determine the Σ5(310)[001] grain boundary motion. The Σ5(310)[001] grain boundary in fcc nickel moves as a result of rearrangements of six atomic planes. The stacking order of atomic planes participating in the grain boundary migration can change. A jump-like manner of grain boundary motion may be divided into two stages. The first stage is a long time interval of stress increase during shear loading. The grain boundary is motionless during this period and accumulates elastic strain energy. This is followed by the stage of jump-like grain boundary motion, which results in rapid stress drop. The related study was focused on understanding the atomic rearrangements responsible for the nucleation of plasticity near different crystallographic surfaces of fcc and bcc metals under nanoindentation. We showed that a wedge-shaped region, which consists of atoms with a changed symmetry of the nearest environment, is formed under the indentation of the (001) surface of the copper crystallite. Stacking faults arise in the (111) atomic planes of the contact zone under the indentation of the (011) surface. Their escape on the side free surface leads to a step formation. Indentation of the (111) surface is accompanied by nucleation of partial dislocations in the contact zone subsequent formation of nanotwins. The results of the nanoindentation of bcc iron bicrystal show that the grain boundary prevents the propagation of structural defects nucleated in the contact zone into the neighboring grain.
APA, Harvard, Vancouver, ISO, and other styles
3

Ohtsuka, H., and G. B. Olson. "Quantitative study on the density of nucleation sites of martensite in an Fe-Pt alloy." In Ecomaterials, 985–88. Elsevier, 1994. http://dx.doi.org/10.1016/b978-1-4832-8381-4.50230-4.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Alloy nucleation study][Lead nucleation"

1

Bhavsar, Vaibhav N., Jyoti Shankar Jha, Ghanshyamsinh Jhala, Alphonsa Joseph, Sushil Mishra, and Asim Tewari. "Characterization of Ti-6Al-4V Alloy Modified by Plasma Nitriding Process." In ASME 2017 Gas Turbine India Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gtindia2017-4855.

Full text
Abstract:
Titanium alloys are gaining widespread acceptance in aerospace industry because of its high specific strength, corrosion resistance and good fatigue properties. Dovetails of the compressor blades, gears, splines etc. are some aerospace components that fail through premature fatigue crack initiation and propagation under the action of wear, fatigue and fretting fatigue. The fretting failure originates from the surface or near surface and leads to the damage of the components. Therefore the surface of components can be modified to improve the tribological performance by plasma nitriding which improve the titanium alloy by forming layer of hard TiN and Ti2N phases on surface. Plasma nitriding of titanium alloys has several advantages over gas and liquid nitriding methods where the phase formation and the depth of nitriding can be controlled. In this study Ti-6Al-4V alloy is taken as surrogate material for gas turbine application and its surface is modified by plasma nitriding at three different temperatures 500, 700 and 800 °C with N2:H2 ratio of 4:1 at 5 mbar pressure for 5 hrs. It is observed from XRD that at 500 and 700 °C temperature, nucleation of ε-Ti2N and δ-TiN started and complete titanium nitride layer formed at 800 °C. Nucleation and growth mechanism was studied by surface and cross section SEM analysis. Nitride layer of around 0.5 μm with ε-Ti2N and around 2 μm thick of both ε-Ti2N and δ-TiN phases were formed at 700 and 800 °C respectively. It is observed that the surface roughness increases with increasing the temperature for plasma nitriding. Vickers microhardness (HV0.1) is observed to be increased from 393.7 HV to 1016.4 HV by plasma nitriding at 800 °C.
APA, Harvard, Vancouver, ISO, and other styles
2

Şişman, Yağmur, Abdolali Khalili Sadaghiani, Khedir R. Khedir, Tansel Karabacak, and Ali Koşar. "Nucleate Boiling Heat Transfer Enhancement Using Nanostructured Al-Alloy Plates." In ASME 2016 5th International Conference on Micro/Nanoscale Heat and Mass Transfer. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/mnhmt2016-6582.

Full text
Abstract:
Bubble departure frequency and active nucleation site density are two main factors that affect the nucleate boiling heat transfer. The potential enhancement of boiling heat transfer can be accomplished by surface modification. This treatment can be realized with changing parameters such as porosity, tilting angle and cavity radius. In this study, effects of different nanostructured Aluminum-Alloy (Al-Alloy) 2024 sheets on subcooled boiling heat transfer are investigated. A simple and environmentally friendly technique is used in order to produce these plates that are immersed into boiling deionized water for 20, 60 and 120 minutes. To examine boiling heat transfer characteristics, nanostructured plates are placed inside a rectangular channel. The channel is heated through four cartridge heaters connected to a DC power supply while deionized water is pumped inside using a micro gear pump at constant mass fluxes of 50 kg/m2s, 75 kg/m2s and 125 kg/m2s. It was found that an increase in nano-structure height leads to higher boiling heat transfer coefficients. Furthermore, a high speed camera system was used to investigate flow patterns in the microchannel. Visualization results indicated that bubbles movde faster the nano-structure height increased.
APA, Harvard, Vancouver, ISO, and other styles
3

Yao, Yao, Jared Fry, Morris Fine, and Leon Keer. "Numerical Analysis to Lead Free Solder/Intermetallic Interconnect With Application of Wiedemann-Franz-Lorenz Relation." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-88634.

Full text
Abstract:
Due to the limitation of available experimental data for thermal conductivity of lead free solder and Intermetallic Compound (IMC) materials, the Wiedemann-Franz-Lorenz (WFL) relation is presented in this paper as a possible solution to predict thermal conductivity with known electrical conductivity. The method is based upon the fact that heat and electrical transport both involve the free electrons. The thermal and electrical conductivities of Cu, Ni, Sn, and different Sn rich lead free solder and IMC materials are studied by employing the WFL relation. Generally, the analysis to the experimental data shows that the WFL relation is obeyed in both solder alloy and IMC materials especially matches close to the relation for Sn, with a positive deviation from the theoretical Lorenz number. Thus, with the available electrical conductivity data, the thermal conductivity of solder and IMC materials can be obtained based on the proper WFL relation, vice versa. With the reduction of size of electronic devices and solder interconnects, it has been observed experimentally that solders fail by crack nucleation and propagation near the interface of IMC and bulk solder. A coupled thermal-electrical finite element analysis is performed to study the behavior of lead free solder/IMC interconnects under different electrical current densities. The joule heating, temperature concentration and electrical current concentration effects with a crack propagating near the interface of solder and IMC are investigated numerically. Solder and IMC material properties predicted using the WFL relation are adopted in the computational model. The effects of different thermal and electrical conductivities of solder and IMC materials on interfacial crack tip temperature are analyzed in the present study. By applying the WFL relation, the amount of experiments required to determine the material properties for different lead free solder/IMC interconnects can be significantly reduced, which can lead to pronounced saving of time and cost.
APA, Harvard, Vancouver, ISO, and other styles
4

Sa, Rongyuan, and Minoru Takahashi. "Thermal Interaction of Lead-Alloy Droplet With Subcooled Water in Pool Water Tank." In 18th International Conference on Nuclear Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/icone18-29621.

Full text
Abstract:
Visualization test was conducted by designing and setting up a special experimental apparatus to investigate characteristics of thermal-hydraulic interaction between lead-alloy droplet and subcooled water in pool water tank. The violent boiling phenomena were observed by a high-speed camera and local transient pressure was measured by high frequency piezo pressure transducer. The results showed that violent boiling mainly occurred when interface temperature between droplet and water was higher than homogenous nucleation temperature of water and subcooling temperature of water was higher than 40K. A violent boiling model for lead-alloy droplet/water interaction was proposed. In the model, partial contact of lead-alloy droplet with water caused by vapor film instability was taken into account to simulate fragmentation due to rapid evaporation.
APA, Harvard, Vancouver, ISO, and other styles
5

Yadav, Shwetabh, and Dinakar Sagapuram. "Nucleation and Boundary Layer Growth of Shear Bands in Machining." In ASME 2019 14th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/msec2019-3022.

Full text
Abstract:
Abstract An experimental study of shear band formation in cutting of metals is made using a low melting point Bi-based alloy as a model material system. High-speed imaging is used to capture the transition in the plastic flow, from laminar to shear banded flow, as a function of cutting speed. The dynamics of shear band nucleation is captured in situ and temporal evolution of localized plastic flow during shear band growth is quantitatively analyzed using an image correlation method, particle image velocimetry (PIV). The observations show that shear band nucleation is governed by a critical shear stress criterion, and accompanied by a large drop in the flow viscosity by several orders of magnitude, analogous to the phenomenon of yielding in yield-stress (Bingham) fluids. Likewise, the displacement field around a freshly nucleated shear band evolves in a manner resembling the boundary layer formation in planar flow of a Bingham fluid with a very small viscosity. Surprisingly, temperature has little influence on shear band nucleation or growth.
APA, Harvard, Vancouver, ISO, and other styles
6

Zoeller, Tracie L., and Thomas H. Sanders. "The Effect of Thermal Treatment on the Microstructural Evolution of an Al-Cu Alloy." In ASME 2003 Heat Transfer Summer Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/ht2003-47149.

Full text
Abstract:
Following solidification, an aluminum alloy microstructure is highly segregated. The microstructure consists of cored dendrites with various soluble and insoluble phases present in the dendritic regions. The solidification rate has a marked effect on the amount of coring that an alloy experiences. Understanding the effects of the solidification rate is important in explaining differences in microstructures. Subsequent heat treatments are performed to homogenize the microstructure. The microstructure evolution after each processing step is dependent upon the previous microstructures. The variation in local chemical composition may promote or hinder precipitation of new phases. A large volume fraction of coarse insoluble phases can lead to the occurrence of recrystallized grains via particle stimulated nucleation, while inhomogeneous solute distribution can lead to the precipitation of an uneven distribution of dispersoid phases. The effect of solidification rate and subsequent thermal treatments on the microstructure of an Al-4Cu alloy will be investigated and experimental and numerical results will be presented.
APA, Harvard, Vancouver, ISO, and other styles
7

Butcher, Cliff, and Zengtao Chen. "A Coupled-Constitutive Model for Ductile Fracture: Void Nucleation to Coalescence." In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-39229.

Full text
Abstract:
A novel framework and integration scheme has been developed to implement a secant-based homogenization theory for particle-reinforced plasticity into an existing damage-based constitutive model, the well known Gurson-Tvergaard (GT) model. In this approach, the material is treated as a three-phase composite composed of voids and particles embedded in a ductile matrix. Two successive homogenization theories (damage- and particle-based) are then applied to determine the macro-mechanical response of the material as well as the average stress state within the constituents as a function of the particle shape, composition, and volume fraction. By identifying the stress state within the particles and the matrix, void nucleation can be accurately represented and the void growth and coalescence models are improved through knowledge of the stress state within the matrix. The performance of the coupled model is evaluated using a model aluminum alloy. A parametric study is performed to elucidate the influence of the second-phase particles and their shape on damage evolution and ductile fracture.
APA, Harvard, Vancouver, ISO, and other styles
8

Yenusah, Caleb O., Yanzhou Ji, Yucheng Liu, Tonya W. Stone, Mark F. Horstemeyer, and Lei Chen. "Investigating the Precipitation Kinetics and Hardening Effects of γ” in Inconel 625 Using a Combination of Meso-Scale Phase-Field Simulations and Macro-Scale Precipitate Strengthening Calculations." In ASME 2020 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/imece2020-23328.

Full text
Abstract:
Abstract Precipitation strengthening of alloys by the formation of secondary particles (precipitates) in the matrix is one of the techniques used for increasing the mechanical strength of metals. Understanding the precipitation kinetics such as nucleation, growth, and coarsening of these precipitates is critical for evaluating their hardening effects and improving the yield strength of the alloy during heat treatment. To optimize the heat treatment strategy and accelerate alloy design, predicting precipitate hardening effects via numerical methods is a promising complement to trial-and-error-based experiments and the physics-based phase-field method stands out with the significant potential to accurately predict the precipitate morphology and kinetics. In this study, we present a phase-field model that captures the nucleation, growth, and coarsening kinetics of precipitates during isothermal heat treatment conditions. Thermodynamic data, diffusion coefficients, and misfit strain data from experimental or lower length-scale calculations are used as input parameters for the phase-field model. Classical nucleation theory is implemented to capture the nucleation kinetics. As a case study, we apply the model to investigate γ″ precipitation kinetics in Inconel 625. The simulated mean particle length, aspect ratio, and volume fraction evolution are in agreement with experimental data for simulations at 600 °C and 650 °C during isothermal heat treatment. Utilizing the meso-scale results from the phase-field simulations as input parameters to a macro-scale coherency strengthening model, the evolution of the yield strength during heat treatment was predicted. In a broader context, we believe the current study can provide practical guidance for applying the phase-field approach as a link in the multiscale modeling of material properties.
APA, Harvard, Vancouver, ISO, and other styles
9

Mo, Kun, Wei Lv, Hsiao-Ming Tung, Di Yun, Yinbin Miao, and James F. Stubbins. "Biaxial Thermal Creep of Alloy 617 and Alloy 230 for VHTR Applications." In ASME 2014 Symposium on Elevated Temperature Application of Materials for Fossil, Nuclear, and Petrochemical Industries. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/etam2014-1002.

Full text
Abstract:
In this study, we employed pressurized creep tubes to investigate the biaxial thermal creep behavior of Inconel 617 (Alloy 617) and Haynes 230 (Alloy 230). Both alloys have been considered to be the primary candidate structural materials for very high temperature reactors (VHTRs) due to their exceptional high-temperature mechanical properties. The current creep experiments were conducted at 900°C for the effective stress range of 15–35 MPa. For both alloys, complete creep strain development with primary, secondary, and tertiary regimes were observed in all studied conditions. The tertiary creep was found to be dominant in the entire creep lives of both alloys. With increasing applied creep stress, the fraction of the secondary creep regime decreases. The nucleation, diffusion, and coarsening of creep voids and carbides on grain boundaries was found to be the main reason for the limited secondary regime, and was also found to be the major cause of creep fracture. The creep curves computed using the adjusted creep equation of the form ε = Aσ cosh−1(1 + rt) + Pσntm agree well with the experimental results for both alloys at the temperatures of 850–950°C. Paper published with permission.
APA, Harvard, Vancouver, ISO, and other styles
10

Shekriladze, Irakli G., Giorgi I. Gigineishvili, Jondo G. Rusishvili, and David I. Shekriladze. "Investigation of Duration-Dependent Multifactoring During Boiling on Down-Facing Heating Surface." In 2010 14th International Heat Transfer Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ihtc14-23386.

Full text
Abstract:
A model of the “theatre of director” (MTD) links dependence of developed boiling HTC only on two external parameters (heat flux and average effective radius of active nucleation sites) to short duration of each action of cooling mechanisms. According multifactoring concept (MFC) significant prolongation of the actions of cooling mechanisms leads to transition to specific regimes with dependence on increased number of factors (duration-dependent multifactoring (DDM)). Splitting of developed boiling heat transfer curve into several curves, depending on sublooling of bulk liquid, direction of gravity field and thermal parameters of heating surface, has been fixed through experimental study of DDM of pool boiling heat transfer on downward-facing horizontal heating surface. Interpretation and qualitative analysis of received experimental data on HTC and video-films of characteristic boiling regimes allow to arriving at the conclusion about applicability of unified consistent research framework MTD-MFC in terms of description of diversity of boiling heat transfer curves.
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Alloy nucleation study][Lead nucleation' for particular source types:
Journal articles
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography