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首页> 外文期刊>Journal of Materials Research >Mechanical behavior of a Zr-based bulk metallic glass and its composite at cryogenic temperatures
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Mechanical behavior of a Zr-based bulk metallic glass and its composite at cryogenic temperatures

机译：锆基大块金属玻璃及其复合材料在低温下的力学行为

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摘要

The mechanical behavior of Zr-Cu-Al bulk metallic glasses (BMGs) and in situ Ta-particle-containing composites (BMGCs) was investigated at 77 K. Their strengths increased significantly whereas the plastic strains remained at comparable levels, when compared to that at 298 K. The interaction between shear bands and particles shows that shear extension in particles has limited penetration, and shear bands build up around particles. Pair distribution functions (PDFs), which carried out at cryogenic and ambient temperatures on the as-cast Zr-Cu-Al bulk metallic glasses, were studied, and simulations with reverse Monte Carlo (RMC) were performed by combining icosahedral and cubic structures as the initial structures. Based on the studies of the pair distribution functions and the Reverse Monte Carlo simulations, the concept of free volume was defined—spaces between clusters with longer bond lengths of atom pairs; the structural model of BMGs was proposed—the strongly bonded clusters correlated with each other and separated by free volume. An attempt has been made to connect the relationship between amorphous structures and their mechanical properties.
机译：研究了Zr-Cu-Al散装金属玻璃（BMG）和原位含Ta颗粒的复合材料（BMGC）的机械性能。与之相比，它们的强度显着提高，而塑性应变保持在可比较的水平。在298 K时，剪切带和颗粒之间的相互作用表明，颗粒中的剪切扩展具有有限的穿透力，并且剪切带在颗粒周围形成。研究了在低温和环境温度下对铸态Zr-Cu-Al大块金属玻璃进行的成对分布函数（PDFs），并通过结合二十面体和立方结构以反向蒙特卡洛（RMC）进行了模拟初始结构。基于对对分布函数的研究和反向蒙特卡洛模拟，定义了自由体积的概念，即具有更长原子对键长的簇之间的空间。提出了BMGs的结构模型-强结合的簇相互关联并被自由体积隔开。已经尝试连接无定形结构与其机械性能之间的关系。

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