Hardness, yield strength, and plastic flow in thin film metallic-glass
Hardness, yield strength, and plastic flow in thin film metallic-glass
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DOI：
10.1063/1.4750028
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发表时间：
2012-09
影响因子：
3.2
通讯作者：
Jianchao Ye;J. Chu;Y. Chen;Qu-Quan Wang;Yong Yang
中科院分区：
文献类型：
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作者：
Jianchao Ye;J. Chu;Y. Chen;Qu-Quan Wang;Yong Yang
薄膜金属玻璃（TFMG）是一种很有前景的结构材料，可用于制造下一代微米和纳米器件；然而，今天仍然缺乏全面的研究来理解它们的机械行为。在本文中，我们对不同厚度的 Zr53Cu29Al12Ni6 TFMG 进行了系统研究。除了结构非晶性的内在因素外，我们的研究还指出了可能影响 TFMG 硬度和屈服强度的其他外在变量。此外，微压缩实验结果表明，TFMG基微柱中的塑性流动表现出强烈的样品尺寸和形状依赖性，表现为当亚微米级膜厚度的TFMG基微柱变形为低纵横比形状时，从非均匀模式到均匀模式的塑性变形平滑过渡。
Thin film metallic-glasses (TFMGs) are a promising structural material for fabricating the next generation of micro- and nano-devices; however, a comprehensive study is still lacking today for understanding their mechanical behaviors. In this article, we present a systematic study on the Zr53Cu29Al12Ni6 TFMGs with varying thicknesses. Other than the intrinsic factor of structural amorphousness, our study pinpoints other extrinsic variables that could affect the hardness and yield strength of the TFMGs. Furthermore, the experimental results from microcompression show that the plastic flow in the TFMG-based micropillars exhibit strong sample size-and-shape dependence, which manifests as a smooth plastic deformation transition from the inhomogeneous to homogeneous mode when the TFMG-based micropillars with a submicron-scale film thickness are deformed into the shape of a low aspect ratio.