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Journal articles on the topic 'In situ micropillar compression'

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Author: Grafiati

Published: 10 December 2022

Last updated: 28 January 2023

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1

Wasmer, K., T. Wermelinger, A. Bidiville, R. Spolenak, and J. Michler. "In situ compression tests on micron-sized silicon pillars by Raman microscopy—Stress measurements and deformation analysis." Journal of Materials Research 23, no. 11 (November 2008): 3040–47. http://dx.doi.org/10.1557/jmr.2008.0363.

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Mechanical properties of silicon are of high interest to the microelectromechanical systems community as it is the most frequently used structural material. Compression tests on 8 μm diameter silicon pillars were performed under a micro-Raman setup. The uniaxial stress in the micropillars was derived from a load cell mounted on a microindenter and from the Raman peak shift. Stress measurements from the load cell and from the micro-Raman spectrum are in excellent agreement. The average compressive failure strength measured in the middle of the micropillars is 5.1 GPa. Transmission electron microscopy investigation of compressed micropillars showed cracks at the pillar surface or in the core. A correlation between crack formation and dislocation activity was observed. The authors strongly believe that the combination of nanoindentation and micro-Raman spectroscopy allowed detection of cracks prior to failure of the micropillar, which also allowed an estimation of the in-plane stress in the vicinity of the crack tip.

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2

Schoell, Ryan, Ce Zheng, Khalid Hattar, and Djamel Kaoumi. "In Situ Micropillar Compression of Irradiated HT9." Microscopy and Microanalysis 26, S2 (July 30, 2020): 2420–22. http://dx.doi.org/10.1017/s1431927620021522.

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3

Jun, Tea-Sung. "Local strain rate sensitivity of α+β phases within dual-phase Ti alloys." Journal of Physics: Conference Series 2169, no. 1 (January 1, 2022): 012040. http://dx.doi.org/10.1088/1742-6596/2169/1/012040.

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Abstract Using in-situ micropillar compression, the local strain rate sensitivity in Ti6242 and Ti6246 has been investigated to strengthen our understanding on the rate- and slip system-sensitive deformation of dual-phase Ti alloys. Electron backscatter diffraction (EBSD) was used to find target grains anticipating basal and primatic slip activities under compression test. Micropillars with similar α orientation and incomparable β morphology were made by a focused ion beam (FIB). Strain rate sensitivity (SRS) was determined based on the constant strain rate method (CSRM). The marked difference of SRS is found in the α+β of both alloys such that in Ti6242 the SRS in the basal slip is considerably higher than that in the prism whilst both slips in Ti6246 show somewhat similar SRS, inferring that either local chemical effects or the β morphology could affect rate-sensitive deformation behaviour.

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4

Kiener, D., P. J. Guruprasad, S. M. Keralavarma, G. Dehm, and A. A. Benzerga. "Work hardening in micropillar compression: In situ experiments and modeling." Acta Materialia 59, no. 10 (June 2011): 3825–40. http://dx.doi.org/10.1016/j.actamat.2011.03.003.

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5

Juri, Afifah Z., Animesh K. Basak, and Ling Yin. "In-situ SEM micropillar compression of porous and dense zirconia materials." Journal of the Mechanical Behavior of Biomedical Materials 132 (August 2022): 105268. http://dx.doi.org/10.1016/j.jmbbm.2022.105268.

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6

Ramachandramoorthy, Rajaprakash, Fan Yang, Daniele Casari, Moritz Stolpe, Manish Jain, Jakob Schwiedrzik, Johann Michler, Jamie J. Kruzic, and James P. Best. "High strain rate in situ micropillar compression of a Zr-based metallic glass." Journal of Materials Research 36, no. 11 (April 20, 2021): 2325–36. http://dx.doi.org/10.1557/s43578-021-00187-5.

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Abstract High strain rate micromechanical testing can assist researchers in elucidating complex deformation mechanisms in advanced material systems. In this work, the interactions of atomic-scale chemistry and strain rate in affecting the deformation response of a Zr-based metallic glass was studied by varying the concentration of oxygen dissolved into the local structure. Compression of micropillars over six decades of strain rate uncovered a remarkable reversal of the strain rate sensitivity from negative to positive above ~ 5 s−1 due to a delocalisation of shear transformation events within the pre-yield linear regime for both samples, while a higher oxygen content was found to generally decrease the strain rate sensitivity effect. It was also identified that the shear band propagation speed increases with the actuation speed, leading to a transition in the deformation behaviour from serrated to apparent non-serrated plastic flow at ~ 5 s−1. Graphic abstract

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7

Wang, S. J., D. Y. Xie, J. Wang, and A. Misra. "Deformation behavior of nanoscale Al–Al2Cu eutectics studied by in situ micropillar compression." Materials Science and Engineering: A 800 (January 2021): 140311. http://dx.doi.org/10.1016/j.msea.2020.140311.

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8

Yano, K. H., M. J. Swenson, Y. Wu, and J. P. Wharry. "TEM in situ micropillar compression tests of ion irradiated oxide dispersion strengthened alloy." Journal of Nuclear Materials 483 (January 2017): 107–20. http://dx.doi.org/10.1016/j.jnucmat.2016.10.049.

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9

Ma, Zhichao, Zhenfeng Qiang, Chaowei Guo, Yue Jiang, Hongwei Zhao, Cuie Wen, and Luquan Ren. "Disparate micro-mechanical behaviors of adjacent bone lamellae through in situ SEM micropillar compression." Materials Science and Engineering: A 825 (September 2021): 141903. http://dx.doi.org/10.1016/j.msea.2021.141903.

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10

Bočan, Jiří, Sadahiro Tsurekawa, and Aleš Jäger. "Fabrication and in situ compression testing of Mg micropillars with a nontrivial cross section: Influence of micropillar geometry on mechanical properties." Materials Science and Engineering: A 687 (February 2017): 337–42. http://dx.doi.org/10.1016/j.msea.2017.01.089.

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11

Richter, N. A., M. Gong, Y. F. Zhang, T. Niu, B. Yang, J. Wang, H. Wang, and X. Zhang. "Exploring the deformation behavior of nanotwinned Al–Zr alloy via in situ compression." Journal of Applied Physics 132, no. 6 (August 14, 2022): 065104. http://dx.doi.org/10.1063/5.0098497.

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Nanotwinned metals have demonstrated the capacity for concomitant high strength and ductility. However, metals with high stacking fault energies, such as aluminum (Al), have a low propensity for twin formation. Here, we show the fabrication of supersaturated solid-solution Al–Zr alloys with a high density of growth twins. Incoherent twin boundaries (ITBs) are strong barriers to dislocation motion, while mobile partial dislocations promote plasticity. These deformable nanotwinned Al–Zr alloys reach a flow stress of ∼1 GPa, as demonstrated using in situ micropillar compression tests. Density functional theory calculations uncover the role Zr solute plays in the formation and deformation of the nanotwinned microstructure. This study features a strategy for incorporating ITBs and 9R phase into Al alloys for simultaneous benefits to strength and deformability.

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12

Jun, Tea-Sung, Ayan Bhowmik, Xavier Maeder, Giorgio Sernicola, Tommaso Giovannini, Igor Dolbnya, Johann Michler, Finn Giuliani, and Ben Britton. "In-situ diffraction based observations of slip near phase boundaries in titanium through micropillar compression." Materials Characterization 184 (February 2022): 111695. http://dx.doi.org/10.1016/j.matchar.2021.111695.

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13

Yano, K. H., M. J. Swenson, Y. Wu, and J. P. Wharry. "Corrigendum to “TEM in situ micropillar compression tests of ion irradiated oxide dispersion strengthened alloy”." Journal of Nuclear Materials 490 (July 2017): 344. http://dx.doi.org/10.1016/j.jnucmat.2017.04.054.

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14

Csanádi, Tamás, Juri Wehrs, Salvatore Grasso, Mike Reece, Johann Michler, and Ján Dusza. "Anomalous slip of ZrB2 ceramic grains during in-situ micropillar compression up to 500 °C." International Journal of Refractory Metals and Hard Materials 80 (April 2019): 270–76. http://dx.doi.org/10.1016/j.ijrmhm.2019.01.021.

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15

Schoell, Ryan, David Frazer, Ce Zheng, Peter Hosemann, and Djamel Kaoumi. "In Situ Micropillar Compression Tests of 304 Stainless Steels After Ion Irradiation and Helium Implantation." JOM 72, no. 7 (March 26, 2020): 2778–85. http://dx.doi.org/10.1007/s11837-020-04127-2.

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16

Moreno, Maiara, Idriss El Azhari, Daniel Apel, Matthias Meixner, Wei Wan, Haroldo Pinto, Flavio Soldera, Frank Mücklich, and José García. "Design of Comb Crack Resistant Milling Inserts: A Comparison of Stresses, Crack Propagation, and Deformation Behavior between Ti(C,N)/α-Al2O3 and Zr(C,N)/α-Al2O3 CVD Coatings." Crystals 11, no. 5 (April 28, 2021): 493. http://dx.doi.org/10.3390/cryst11050493.

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Investigations on comb crack resistance of milling inserts coated with chemical vapor deposition (CVD) Ti(C,N)/α-Al2O3 and Zr(C,N)/α-Al2O3 showed a distinct wear evolution in both systems. Wear studies revealed that the appearance of comb cracks is connected to the initial CVD cooling crack network. Micropillar compression tests indicated a brittle intergranular fracture mechanism for the Ti(C,N) layer and a transgranular fracture accompanied with signs of plastic deformation for the Zr(C,N) coating. Additionally, for the Zr(C,N) based system, a compressive stress condition in the temperature range of interest (200–600 °C) was determined by in-situ synchrotron X-ray diffraction. The set of residual compressive stresses together with the ability of the Zr(C,N) layer to deform plastically are key features that explain the enhanced resistance to comb crack wear of the Zr(C,N) based system in milling of cast iron.

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17

Su, Ruizhe, Dajla Neffati, Jaehun Cho, Zhongxia Shang, Yifan Zhang, Jie Ding, Qiang Li, et al. "High-strength nanocrystalline intermetallics with room temperature deformability enabled by nanometer thick grain boundaries." Science Advances 7, no. 27 (July 2021): eabc8288. http://dx.doi.org/10.1126/sciadv.abc8288.

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Although intermetallics are attractive for their high strength, many of them are often brittle at room temperature, thereby severely limiting their potential as structural materials. Here, we report on a previously unidentified deformable nanocrystalline CoAl intermetallics with Co-rich thick grain boundaries (GBs). In situ micropillar compression studies show that nanocrystalline CoAl with thick GBs exhibits ultrahigh yield strength, exceeding 4.5 gigapascals. Unexpectedly, nanocrystalline CoAl intermetallics also show prominent work hardening to a flow stress of 5.7 gigapascals up to 20% compressive strain. Transmission electron microscopy studies show that deformation induces abundant dislocations inside CoAl grains with thick GBs, which accommodate plastic deformation. Molecular dynamics simulations reveal that the Co-rich thick GBs play a vital role in promoting nucleation of dislocations at the Co/CoAl interfaces, thereby enhancing the plasticity of the intermetallics. This study provides a perspective to promoting the plasticity of intermetallics via the introduction of thick GBs.

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18

Zhao, Yongfeng, Arun Sundar S. Singaravelu, Xia Ma, Qingdong Zhang, Shery L. Y. Chang, Xiangfa Liu, and Nikhilesh Chawla. "Unveiling the deformation behavior and strengthening mechanisms of Al3BC/Al composites via in-situ micropillar compression." Journal of Alloys and Compounds 823 (May 2020): 153842. http://dx.doi.org/10.1016/j.jallcom.2020.153842.

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19

Schwiedrzik, Jakob, Rejin Raghavan, Alexander Bürki, Victor LeNader, Uwe Wolfram, Johann Michler, and Philippe Zysset. "In situ micropillar compression reveals superior strength and ductility but an absence of damage in lamellar bone." Nature Materials 13, no. 7 (June 8, 2014): 740–47. http://dx.doi.org/10.1038/nmat3959.

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20

Barnoush, Afrooz, Jules Dake, Nousha Kheradmand, and Horst Vehoff. "Examination of hydrogen embrittlement in FeAl by means of in situ electrochemical micropillar compression and nanoindentation techniques." Intermetallics 18, no. 7 (July 2010): 1385–89. http://dx.doi.org/10.1016/j.intermet.2010.01.001.

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21

Moser, B., K. Wasmer, L. Barbieri, and J. Michler. "Strength and fracture of Si micropillars: A new scanning electron microscopy-based micro-compression test." Journal of Materials Research 22, no. 4 (April 2007): 1004–11. http://dx.doi.org/10.1557/jmr.2007.0140.

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A novel method for in situ scanning electron microscope (SEM) micro-compression tests is presented. The direct SEM observation during the instrumented compression testing allows for very efficient positioning and assessment of the failure mechanism. Compression tests on micromachined Si pillars with volumes down to 2 μm3are performed inside the SEM, and the results demonstrate the potential of the method. In situ observation shows that small diameter pillars tend to buckle while larger ones tend to crack before failure. Compressive strength increases with decreasing pillar diameter and reaches almost 9 GPa for submicrometer diameter pillars. This result is in agreement with earlier bending experiments on Si. Difficulties associated with precise strain measurements are discussed.

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22

Lu, Xu, and Dong Wang. "Effect of hydrogen on deformation behavior of Alloy 725 revealed by in-situ bi-crystalline micropillar compression test." Journal of Materials Science & Technology 67 (March 2021): 243–53. http://dx.doi.org/10.1016/j.jmst.2020.08.006.

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23

Kabel, Joey, Thomas E. J. Edwards, Amit Sharma, Johann Michler, and Peter Hosemann. "Direct observation of the elasticity-texture relationship in pyrolytic carbon via in situ micropillar compression and digital image correlation." Carbon 182 (September 2021): 571–84. http://dx.doi.org/10.1016/j.carbon.2021.06.045.

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24

Keller, Lukas M., Jakob J. Schwiedrzik, Philippe Gasser, and Johann Michler. "Understanding anisotropic mechanical properties of shales at different length scales: In situ micropillar compression combined with finite element calculations." Journal of Geophysical Research: Solid Earth 122, no. 8 (August 2017): 5945–55. http://dx.doi.org/10.1002/2017jb014240.

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25

Niederberger, C., W. M. Mook, X. Maeder, and J. Michler. "In situ electron backscatter diffraction (EBSD) during the compression of micropillars." Materials Science and Engineering: A 527, no. 16-17 (June 2010): 4306–11. http://dx.doi.org/10.1016/j.msea.2010.03.055.

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26

Singh, Somya, C. Shashank Kaira, Hrishikesh Bale, Chuong Huynh, Arno Merkle, and Nikhilesh Chawla. "In situ micropillar compression of Al/SiC nanolaminates using laboratory-based nanoscale X-ray microscopy: Effect of nanopores on mechanical behavior." Materials Characterization 150 (April 2019): 207–12. http://dx.doi.org/10.1016/j.matchar.2019.02.030.

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27

Anwar Ali, Hashina P., Ihor Radchenko, Jiahui Zhou, Liu Qing, and Arief Budiman. "Designing novel multilayered nanocomposites for high-performance coating materials with online strain monitoring capability." Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 233, no. 4 (March 28, 2017): 664–75. http://dx.doi.org/10.1177/1464420717695354.

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Multilayered nanocomposites, known for its mechanical properties of very high flow strength, ultra-light weight and stable plastic flow to large strains, represent a class of novel composite nanomaterials in which there arises rare opportunities to design new materials from the ground up and to tailor their properties to suit exactly their performance requirements. These materials can withstand very high strains in the elastic regime without any inelastic relaxation due to plasticity or fracture compared to its bulk counterparts. This extended elastic regime opens up new possibilities for tuning the physical and chemical properties of materials as well as bringing novel functionalities, such as high performance coating materials with online strain monitoring capability. Our resistivity measurements during ex situ uniaxial micropillar compression in this article suggests basic feasibility of a Cu–Nb multilayered nanocomposite with 20 nm layer thickness having a novel functionality for online strain monitoring capability, in addition to its more known application as a high performance coating materials due to its extraordinary strength and deformability. A linear trend of resistivity with respect to true strain for strains in excess of 3.5% was observed and suggests a significant regime for use for strain sensor/detection/monitoring capability.

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28

Hegyi, Ádám István, Péter Dusán Ispánovity, Michal Knapek, Dániel Tüzes, Kristián Máthis, František Chmelík, Zoltán Dankházi, Gábor Varga, and István Groma. "Micron-Scale Deformation: A Coupled In Situ Study of Strain Bursts and Acoustic Emission." Microscopy and Microanalysis 23, no. 6 (October 17, 2017): 1076–81. http://dx.doi.org/10.1017/s1431927617012594.

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AbstractPlastic deformation of micron-scale crystalline materials differs considerably from bulk samples as it is characterized by stochastic strain bursts. To obtain a detailed picture of the intermittent deformation phenomena, numerous micron-sized specimens must be fabricated and tested. An improved focused ion beam fabrication method is proposed to prepare non-tapered micropillars with excellent control over their shape. Moreover, the fabrication time is less compared with other methods. The in situ compression device developed in our laboratory allows high-accuracy sample positioning and force/displacement measurements with high data sampling rates. The collective avalanche-like motion of the dislocations is observed as stress decreases on the stress–strain curves. An acoustic emission (AE) technique was employed for the first time to study the deformation behavior of micropillars. The AE technique provides important additional in situ information about the underlying processes during plastic deformation and is especially sensitive to the collective avalanche-like motion of the dislocations observed as the stress decreases on the deformation curves.

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29

Huskins, Emily L., Zachary C. Cordero, Christopher A. Schuh, and Brian E. Schuster. "Micropillar compression testing of powders." Journal of Materials Science 50, no. 21 (July 21, 2015): 7058–63. http://dx.doi.org/10.1007/s10853-015-9260-1.

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30

Shahbeyk, Voyiadjis, Habibi, Astaneh, and Yaghoobi. "Review of Size Effects during Micropillar Compression Test: Experiments and Atomistic Simulations." Crystals 9, no. 11 (November 10, 2019): 591. http://dx.doi.org/10.3390/cryst9110591.

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The micropillar compression test is a novel experiment to study the mechanical properties of materials at small length scales of micro and nano. The results of the micropillar compression experiments show that the strength of the material depends on the pillar diameter, which is commonly termed as size effects. In the current work, first, the experimental observations and theoretical models of size effects during micropillar compression tests are reviewed in the case of crystalline metals. In the next step, the recent computer simulations using molecular dynamics are reviewed as a powerful tool to investigate the micropillar compression experiment and its governing mechanisms of size effects.

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31

Camposilvan, Erik, and Marc Anglada. "Micropillar compression inside zirconia degraded layer." Journal of the European Ceramic Society 35, no. 14 (November 2015): 4051–58. http://dx.doi.org/10.1016/j.jeurceramsoc.2015.04.017.

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32

Singh, D. R. P., N. Chawla, G. Tang, and Y. L. Shen. "Micropillar compression of Al/SiC nanolaminates." Acta Materialia 58, no. 20 (December 2010): 6628–36. http://dx.doi.org/10.1016/j.actamat.2010.08.025.

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33

Maeder, X., W. M. Mook, C. Niederberger, and J. Michler. "Quantitative stress/strain mapping during micropillar compression." Philosophical Magazine 91, no. 7-9 (March 2011): 1097–107. http://dx.doi.org/10.1080/14786435.2010.505178.

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34

Korte, S., and W. J. Clegg. "Micropillar compression of ceramics at elevated temperatures." Scripta Materialia 60, no. 9 (May 2009): 807–10. http://dx.doi.org/10.1016/j.scriptamat.2009.01.029.

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35

Kuroda, Mitsutoshi. "Higher-order gradient effects in micropillar compression." Acta Materialia 61, no. 7 (April 2013): 2283–97. http://dx.doi.org/10.1016/j.actamat.2012.12.038.

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36

Sly, Michael K., Arashdeep S. Thind, Rohan Mishra, Katharine M. Flores, and Philip Skemer. "Low-temperature rheology of calcite." Geophysical Journal International 221, no. 1 (December 31, 2019): 129–41. http://dx.doi.org/10.1093/gji/ggz577.

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SUMMARY Low-temperature plastic rheology of calcite plays a significant role in the dynamics of Earth's crust. However, it is technically challenging to study plastic rheology at low temperatures because of the high confining pressures required to inhibit fracturing. Micromechanical tests, such as nanoindentation and micropillar compression, can provide insight into plastic rheology under these conditions because, due to the small scale, plastic deformation can be achieved at low temperatures without the need for secondary confinement. In this study, nanoindentation and micropillar compression experiments were performed on oriented grains within a polycrystalline sample of Carrara marble at temperatures ranging from 23 to 175 °C, using a nanoindenter. Indentation hardness is acquired directly from nanoindentation experiments. These data are then used to calculate yield stress as a function of temperature using numerical approaches that model the stress state under the indenter. Indentation data are complemented by uniaxial micropillar compression experiments. Cylindrical micropillars ∼1 and ∼3 μm in diameter were fabricated using a focused ion beam-based micromachining technique. Yield stress in micropillar experiments is determined directly from the applied load and micropillar dimensions. Mechanical data are fit to constitutive flow laws for low-temperature plasticity and compared to extrapolations of similar flow laws from high-temperature experiments. This study also considered the effects of crystallographic orientation on yield stress in calcite. Although there is a clear orientation dependence to plastic yielding, this effect is relatively small in comparison to the influence of temperature.

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37

Paccou, Elie, Benoît Tanguy, and Marc Legros. "Micropillar compression study of Fe-irradiated 304L steel." Scripta Materialia 172 (November 2019): 56–60. http://dx.doi.org/10.1016/j.scriptamat.2019.07.007.

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38

Howie, Philip R., Sandra Korte, and William J. Clegg. "Fracture modes in micropillar compression of brittle crystals." Journal of Materials Research 27, no. 1 (September 13, 2011): 141–51. http://dx.doi.org/10.1557/jmr.2011.256.

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39

Lotfian, S., M. Rodríguez, K. E. Yazzie, N. Chawla, J. Llorca, and J. M. Molina-Aldareguía. "High temperature micropillar compression of Al/SiC nanolaminates." Acta Materialia 61, no. 12 (July 2013): 4439–51. http://dx.doi.org/10.1016/j.actamat.2013.04.013.

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40

Tasan, C. C., J. P. M. Hoefnagels, and M. G. D. Geers. "A Micropillar Compression Methodology for Ductile Damage Quantification." Metallurgical and Materials Transactions A 43, no. 3 (December 14, 2011): 796–801. http://dx.doi.org/10.1007/s11661-011-1021-4.

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41

Zhao, Yongfeng, Arun Sundar S. Singaravelu, Xia Ma, Xiangfa Liu, and Nikhilesh Chawla. "Mechanical properties of Al3BC by nanoindentation and micropillar compression." Materials Letters 264 (April 2020): 127361. http://dx.doi.org/10.1016/j.matlet.2020.127361.

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42

Jiang, L., and N. Chawla. "Mechanical properties of Cu6Sn5 intermetallic by micropillar compression testing." Scripta Materialia 63, no. 5 (September 2010): 480–83. http://dx.doi.org/10.1016/j.scriptamat.2010.05.009.

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43

Shiau, Ching-Heng, Miguel Pena, Yongchang Li, Sisi Xiang, Cheng Sun, Michael McMurtrey, and Lin Shao. "Micropillar Compression of Additively Manufactured 316L Stainless Steels after 2 MeV Proton Irradiation: A Comparison Study between Planar and Cross-Sectional Micropillars." Metals 12, no. 11 (October 28, 2022): 1843. http://dx.doi.org/10.3390/met12111843.

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A micropillar compression study with two different techniques was performed on proton-irradiated additively manufactured (AM) 316L stainless steels. The sample was irradiated at 360 °C using 2 MeV protons to 1.8 average displacement per atom (dpa) in the near-surface region. A comparison study with mechanical test and microstructure characterization was made between planar and cross-sectional pillars prepared from the irradiated surface. While a 2 MeV proton irradiation creates a relatively flat damage zone up to 12 µm, the dpa gradient by a factor of 2 leads to significant dpa uncertainty along the pillar height direction for the conventional planar technique. Cross-sectional pillars can significantly reduce such dpa uncertainty. From one single sample, three cross-sectional pillars were able to show dpa-dependent hardening. Furthermore, post-compression transmission electron microscopy allows the determination of the deformation mechanism of individual micropillars. Cross-sectional micropillar compression can be used to study radiation-induced mechanical property changes with better resolution and less data fluctuation.

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44

Weekes, H. E., V. A. Vorontsov, I. P. Dolbnya, J. D. Plummer, F. Giuliani, T. B. Britton, and D. Dye. "In situ micropillar deformation of hydrides in Zircaloy-4." Acta Materialia 92 (June 2015): 81–96. http://dx.doi.org/10.1016/j.actamat.2015.03.037.

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45

Gu, Ting, Ping Cheng, Su Wang, Huiying Wang, Xuhan Dai, Hong Wang, and Guifu Ding. "Mechanical property evaluation of TSV-Cu micropillar by compression method." Electronic Materials Letters 10, no. 4 (July 2014): 851–55. http://dx.doi.org/10.1007/s13391-014-3286-4.

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46

Zhu, Yujuan, Li Wang, Hao Yu, Fangchao Yin, Yaqing Wang, Haitao Liu, Lei Jiang, and Jianhua Qin. "In situ generation of human brain organoids on a micropillar array." Lab on a Chip 17, no. 17 (2017): 2941–50. http://dx.doi.org/10.1039/c7lc00682a.

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We present a simple and high throughput manner to generate brain organoids in situ from human induced pluripotent stem cells on micropillar arrays and to investigate long-term brain organogenesis in 3D culture in vitro.

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47

Gubicza, Jenő, Garima Kapoor, Dávid Ugi, László Péter, János L. Lábár, and György Radnóczi. "Micropillar Compression Study on the Deformation Behavior of Electrodeposited Ni–Mo Films." Coatings 10, no. 3 (February 27, 2020): 205. http://dx.doi.org/10.3390/coatings10030205.

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The influence of Mo addition on the compression behavior of Ni films was studied by micropillar deformation tests. Thus, films with low (0.4 at.%) and high (5.3 at.%) Mo contents were processed by electrodeposition and tested by micropillar compression up to the plastic strain of about 0.26. The microstructures of the films before and after compression were studied by transmission electron microscopy. It was found that the as-deposited sample with high Mo concentration has a much lower grain size (~26 nm) than that for the layer with low Mo content (~240 nm). In addition, the density of lattice defects such as dislocations and twin faults was considerably higher for the specimen containing a larger amount of Mo. These differences resulted in a four-times higher yield strength for the latter sample. The Ni film with low Mo concentration showed a normal strain hardening while the sample having high Mo content exhibited a continuous softening after a short hardening period. The strain softening was attributed to detwinning during deformation.

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Zhang, Wei, Hongcai Xie, Zhichao Ma, Hongwei Zhao, and Luquan Ren. "Graphene Oxide-Induced Substantial Strengthening of High-Entropy Alloy Revealed by Micropillar Compression and Molecular Dynamics Simulation." Research 2022 (August 25, 2022): 1–10. http://dx.doi.org/10.34133/2022/9839403.

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Plastic deformation mechanisms at micro/nanoscale of graphene oxide-reinforced high-entropy alloy composites (HEA/GO) remain unclear. In this study, small-scale mechanical behaviors were evaluated for HEA/GO composites with 0.0 wt.%, 0.3 wt.%, 0.6 wt.%, and 1.0 wt.% GO, consisting of compression testing on micropillar and molecular dynamics (MD) simulations on nanopillars. The experimental results uncovered that the composites exhibited a higher yield strength and flow stress compared with pure HEA micropillar, resulting from the GO reinforcement and grain refinement strengthening. This was also confirmed by the MD simulations of pure HEA and HEA/GO composite nanopillars. The immobile <100> interstitial dislocations also participated in the plastic deformation of composites, in contrast to pure HEA counterpart where only mobile 1/2 <111> perfect dislocations dominated deformation, leading to a higher yield strength for composite. Meanwhile, the MD simulations also revealed that the flow stress of composite nanopillar was significantly improved due to GO sheet effectively impeded dislocation movement. Furthermore, the mechanical properties of HEA/1.0 wt.% GO composite showed a slight reduction compared with HEA/0.6 wt.% GO composite. This correlated with the compositional segregation of Cr carbide and aggregation of GO sheets, indicative of lower work hardening rate in stress-strain curves of micropillar compression.

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Östlund, Fredrik, Philip R. Howie, Rudy Ghisleni, Sandra Korte, Klaus Leifer, William J. Clegg, and Johann Michler. "Ductile–brittle transition in micropillar compression of GaAs at room temperature." Philosophical Magazine 91, no. 7-9 (March 2011): 1190–99. http://dx.doi.org/10.1080/14786435.2010.509286.

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Yilmaz, Ezgi D., Sabine Bechtle, Hüseyin Özcoban, Andreas Schreyer, and Gerold A. Schneider. "Fracture behavior of hydroxyapatite nanofibers in dental enamel under micropillar compression." Scripta Materialia 68, no. 6 (March 2013): 404–7. http://dx.doi.org/10.1016/j.scriptamat.2012.11.007.

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