Relevant bibliographies by topics / Ageing response hardness

Academic literature on the topic 'Ageing response hardness'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Ageing response hardness"

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Nur Hidayah, A. Z., J. B. Shamsul, K. R. Ahmad, A. A. Sinar, and Ahmad Mujahid Ahmad Zaidi. "Ageing Response of Powder Metallurgy AZ91 and AZ91 Reinforced with Multiwall Carbon Nanotube." Materials Science Forum 857 (May 2016): 261–65. http://dx.doi.org/10.4028/www.scientific.net/msf.857.261.

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Powder metallurgy metal matrix composites based on AZ91 alloy matrix reinforced with 0.3, 0.6 and 0.9 weight percent of multiwall carbon nanotube (MWCNT) were investigated from the point of view of their response to artificial ageing as compared to the unreinforced AZ91 matrix alloy. Mg-Zn-Al (AZ91) and its composite were prepared by milling the raw materials and followed by sintering at 450°C for 2 hours. The sintered samples were solution treated at 415°C for 2 hours and followed by artificial ageing at 175°C. The ageing behavior was monitored by following the phase analysis and hardness of the samples examined. Microstructure of the sintered composites indicated that MWCNT was embedded in the AZ91 matrix alloy. All composites indicated lower hardness than matrix, however AZ91reinforced with 0.6 and 0.9 weight percent of CNT showed accelerated ageing. X-ray diffraction pattern indicated the present of β-phase (Mg17Al12) that responsible for the hardening behavior.
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Yan, Yong, Ze Qin Liang, and John Banhart. "Influence of Pre-Straining and Pre-Ageing on the Age-Hardening Response of Al-Mg-Si Alloys." Materials Science Forum 794-796 (June 2014): 903–8. http://dx.doi.org/10.4028/www.scientific.net/msf.794-796.903.

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The effect of pre-straining and pre-ageing on the age hardening response of Al-0.6%Mg-0.8%Si alloy is studied by Vickers hardness and differential scanning calorimetry (DSC). It is found that pre-ageing can suppress the formation of unwanted clusters and keeps the structure stable for a certain time. A pre-ageing treatment can effectively reduce or avoid the negative effect of natural ageing on artificial ageing and even produce a positive effect. Cluster formation can also be reduced by pre-straining, but the kinetics of clustering is still similar to that of the as-quenched condition. In contrast, after pre-straining, the peak positions of β and β move to lower temperatures and peak hardness is achieved in a shorter time, indicating that the formation of β and β is accelerated by pre-straining. However, the negative effect of natural ageing still persists after pre-straining. Pre-straining before pre-aging can take advantage of both techniques and produce a positive strength response. For pre-straining after pre-aging, pre-straining tends to destabilize the structure created by pre-ageing and can reactivate the clustering process, which has negative effect on subsequent artificial ageing.
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Chen, Zhong Wei, Li Fan, and Pei Chen. "Early Age Hardening Response of Al-Cu-Mg Alloys." Advanced Materials Research 146-147 (October 2010): 1327–30. http://dx.doi.org/10.4028/www.scientific.net/amr.146-147.1327.

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The early age hardening behavior in Al-Cu-Mg alloys with fixed Cu content (0.50 wt%) and varying amounts of Mg has been studied by hardness tests and TEM observation. Two alloys both exhibit the early rapid hardening phenomenon based on large solute-aggregates analysis. Ageing time of early stage rapid hardening of Al-0.5Cu-1.99Mg alloys is less than that of Al-0.5Cu-1.48Mg alloys. For two alloys, ageing time of early stage rapid age hardening reduces with artificial ageing temperature increasing. The early stage rapid age hardening is depended on the composition and artificial ageing temperature. Forming larger solute-aggregates may give rise to early rapid age hardening.
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Cao, Ling Fei, Paul A. Rometsch, Hao Zhong, and Barry C. Muddle. "Effect of Pre-Ageing on the Artificial Ageing Response of Al-Mg-Si(-Cu) Alloys." Materials Science Forum 654-656 (June 2010): 918–21. http://dx.doi.org/10.4028/www.scientific.net/msf.654-656.918.

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The effect of different pre-ageing treatments on the subsequent artificial ageing response of Al-Mg-Si(-Cu) alloys have been investigated using hardness, tensile and electrical conductivity testing. The microstructural evolution was characterised by differential scanning calorimetry (DSC) and 3-dimensional atom probe (3DAP) analysis. Pre-ageing treatments were carried out at 160-250°C for short times. Results show that the early stage artificial ageing response after 30 minutes at 170°C is strongly influenced by the pre-ageing and natural ageing conditions. A pre-ageing treatment performed for a short time at a high temperature and within a short delay after solution treatment and quenching was found to give a promising hardening response during subsequent artificial ageing. The mechanisms by which pre-ageing can reduce the detrimental effect of natural ageing on the artificial ageing response will be discussed in relation to the formation and distribution of clusters, GP zones and/or precipitates.
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Zhong, Hao, Bin Liao, Xiao Dong Wu, Ling Fei Cao, and Paul A. Rometsch. "Development of Al-Mg-Si-(Cu) Alloys for Automotive Body Panels and the Related Ageing Behaviours." Materials Science Forum 879 (November 2016): 279–83. http://dx.doi.org/10.4028/www.scientific.net/msf.879.279.

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In this work, Al-Mg-Si-Cu alloys for automotive body panels were designed and the related ageing behaviours were discussed in detail to help understand natural ageing and pre-ageing, as well as their influence on the subsequent paint-bake response. The clustering behavior of these Al-Mg-Si-Cu alloys in different ageing conditions was investigated by hardness / yield strength and electrical conductivity testing. The microstructure was investigated by using Electron Backscattered Diffraction (EBSD) technique, along with Scanning Electron Microscopy with Backscattered Electron Detector (BSE). The results show that the paint bake response is strongly influenced by the pre-ageing and natural ageing conditions. Both alloys show serrated yielding in a short natural ageing condition. Immediate high-temperature pre-ageing treatments were found to give a promising hardening response during the subsequent artificial ageing/ paint baking at 170oC.
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Nurcahyaningsih, Dwi Ayu, Risly Wijanarko, Irene Angela, and Bondan Tiara Sofyan. "Effect of Ti Addition to Age Hardening Response of Al-10Zn-6MgxTi Alloy Produced by Squeeze Casting." MATEC Web of Conferences 186 (2018): 02009. http://dx.doi.org/10.1051/matecconf/201818602009.

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This research focused on investigating the effects of Ti addition on the age hardening response of Al 7xxx alloy for Organic Rankine Cycle (ORC) turbine impeller application in power plant generators. Al-10Zn-6Mg wt. % alloys were produced by squeeze casting with 0.02, 0.05, and 0.25 wt. % Ti addition. As-cast samples were homogenized at 400 °C for 4 h. Solution treatment was conducted at 440 °C for 1 h, followed by quenching and ageing at 130 °C for 200 h. Age hardening result was observed using Rockwell B hardness measurement. Other characterizations included impact testing, STA, optical microscopy, and SEM-EDS. Results showed that the addition of Ti in all content variations increased the as-cast hardness due to the diminution of secondary dendrite arm spacing (SDAS) values of the alloy. Ageing at 130 °C strengthened the alloys, however the addition of Ti was not found to affect neither peak hardness nor impact values of the alloy. Identities of second phases formed during solidification were found to be T (Mg32(Al,Zn)49), β (Al8Mg5), and TiAl3, while precipitates produced during ageing were GP Zone, η′, and η (MgZn2).
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Aiza Jaafar, C. N., I. Zainol, and Mohd Amirul Zalif Mohamad Sapri. "The Effects of Thermal Ageing on Properties and Microstructure of Al-6063 Alloy." Key Engineering Materials 694 (May 2016): 111–15. http://dx.doi.org/10.4028/www.scientific.net/kem.694.111.

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The effect of thermal ageing on the properties and microstructure of Al-Mg-Si alloy was investigated. In this work, an extruded Al-6063 alloy samples were used as the main materials. In order to study the effect of thermal ageing, the alloy samples were solution treated at 530 °C and then quenched into water before artificially aged at elevated temperatures between 120 and 250 °C. The ageing response and mechanical properties was monitored by Vickers hardness and tensile tests, respectively. The analysis of surface fracture and microstructure of peak aged alloy were carried out by means of scanning electron microscope (SEM) and transmission electron microscope (TEM), respectively. Result shows that the highest hardness value and tensile properties is gained by the alloy that aged at 120 °C. It is found that increasing in hardness and strength values of the alloy are due to precipitates formation during thermal ageing. Fracture analysis on peak-aged condition indicates that the alloy having more ductility after thermal ageing. The result shows that the higher ageing temperature will lead to the higher ductility of the Al-6063 alloy, as a results the alloy’s strength is reduced.
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Gardner, H. M., A. Radecka, D. Rugg, D. E. J. Armstrong, M. P. Moody, and P. A. J. Bagot. "The Role of Oxygen in α2 Formation in the Titanium Model Alloy Ti-7Al." MATEC Web of Conferences 321 (2020): 04003. http://dx.doi.org/10.1051/matecconf/202032104003.

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The mechanical and microstructural response of a model Ti-7wt.%Al alloy doped with 500 wppm oxygen has been examined in detail as a function of ageing. Three ageing conditions, ice-water quenched, and aged at 550 oC for 10 or 49 days were examined in detail as a function of ageing. Nanoindentation was used to measure hardness as a function of ageing, while Atom Probe Tomography (APT) also revealed α2 precipitation in the aged samples. The partitioning pReference of oxygen to the α matrix instead of the α2 precipitates has been directly measured.
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Chauke, Levy, Pfarelo Daswa, Heinrich Möller, and Gonasagren Govender. "The Effect of Natural Pre-Ageing on the Mechanical Properties of Rheo-High Pressure Die Cast Aluminium Alloy 2139." Materials Science Forum 828-829 (August 2015): 244–49. http://dx.doi.org/10.4028/www.scientific.net/msf.828-829.244.

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Near-net shape casting of wrought aluminium alloys has proven to be difficult due to hot tearing. The Council for Scientific and Industrial Research (CSIR) has successfully processed wrought aluminium alloy 2139 into plate castings using the Rheo-high pressure die casting process (R-HPDC). Alloy 2139 is a Ag-containing aluminium alloy from the Al-Cu-Mg 2xxx series family. The addition of Ag enhances the age hardening response through the formation of co-clusters that act as precursors to the formation of plate-like Ω precipitates. These co-clusters typically form during natural ageing and 12-24 h of natural pre-ageing is normally specified before artificial ageing in Ag-containing Al-Cu-Mg alloys. The T6 hardness and tensile properties of R-HPDC 2139 alloy were investigated with and without natural pre-ageing. It is shown that there is no significant difference in both peak hardness and tensile properties in R-HPDC alloy 2139 with and without natural pre-ageing. The possible precipitation phenomena in both cases are discussed.
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Jauhari, Inas M., Danny Taufik Bahar, Syarah Khayrun Nisa, and Bondan Tiara Sofyan. "Effects of Cu Addition on Age Hardening Response of Al-7Si-4Mg Alloys at 130 °C." Key Engineering Materials 833 (March 2020): 74–79. http://dx.doi.org/10.4028/www.scientific.net/kem.833.74.

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The effects of Cu addition of 0.38, 3.82, and 6 wt. % in Al-7Si-4Mg alloy on hardness and age hardening response were discussed. Samples were solution treated at 495 °C for 2 h, quenched, and aged at 130 °C for 0 to 498 h. Characterization included hardness test, microstructural observation by an optical microscope (OM) and Scanning Electron Microscope (SEM) combined with Energy Dispersive X-Rays Spectroscopy (EDX), as well as Simultaneous Thermal Analysis (STA) testing. The results showed an increased in as-cast hardness along with addition of Cu. Peak hardness increased to 64.47, 65.8, and 70.1 HRB by addition of 0.38, 3.82, and 6 wt. % Cu, respectively. The addition of Cu promoted the formation of Al2Cu and Al5Cu2Mg8Si6 which contributed to higher as-cast hardness. Formation of GP-zone, θ”, and θ’ was observed after ageing at 48, 240, and 290 °C, respectively and no effects of Cu was detected on the formation temperatures of the precipitates.
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Book chapters on the topic "Ageing response hardness"

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Sahoo, Prasanta, Supriyo Roy, and J. Paulo Davim. "Design and Selection of Chemically Deposited Ni-P-W Coatings for Optimum Tribological Behavior." In Surface Engineering Techniques and Applications, 45–72. IGI Global, 2014. http://dx.doi.org/10.4018/978-1-4666-5141-8.ch002.

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Chemically deposited nickel coatings possess superior tribological properties such as high hardness, good wear, and corrosion resistance. The quest for improved tribological performance has led to the design and selection of newer variants of these coatings. The present chapter deals with the development of Ni-P-W coating on mild steel substrate and the improvement of tribological characteristics through modification of the coating process parameters. Three coating process parameters, concentration of nickel source, concentration of reducing agent, and concentration of tungsten source along with the annealing temperature, are optimized for minimum friction and wear of the coating. Friction and wear tests are carried out in a multi-tribotester using block on roller configuration under dry conditions. Taguchi-based grey relational analysis is employed for the optimization of this multiple response problem using L27 orthogonal array. Analysis of variance shows that the concentration of nickel source, the interaction between nickel source concentration, and reducing agent concentration, and also the interaction between nickel source concentration and tungsten source concentration have significant influence in controlling the friction and wear behavior of chemically deposited Ni-P-W coating. It is observed that wear mechanism is a mild adhesive in nature. The structural morphology, composition, and phase structure of the coating are studied with the help of Scanning Electron Microscopy (SEM), Energy Dispersive X-Ray analysis (EDX), and X-Ray Diffraction analysis (XRD), respectively.
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