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Effect of shape memory alloys on the mechanical properties of metallic glasses: A molecular dynamics study
Computational Materials Science ( IF 3.3 ) Pub Date : 2021-02-01 , DOI: 10.1016/j.commatsci.2020.110088
W.W. Li , H.Y. Song , J.L. Dai , J.Y. Wang , M.R. An , Y.L. Li

Abstract The strength-plasticity trade-off of metallic glass (MG) has not still been effectively overcome. The introduction of shape memory alloy (SMA) is an effective way to improve the mechanical properties of MG. Here, the deformation behavior of amorphous/SMA Cu64Zr36/B2-CuZr nanomultilayers (ASNMs) under tension loading is investigated by molecular dynamics (MD) simulation method. The results show that the peak stresses and flow stress of the ASNMs are greater than those of the monolithic MG regardless of SMA volume fraction. The martensitic transformation (MT) in the SMA phase limits the propagation of shear bands (SBs), avoids a runaway instability, and simultaneously induces plastic strain strengthening. The results also indicate that the plastic deformation mode of ASNMs changes from the interaction of multiple SBs dominated to finally brittle fracture caused by nano-pores aggregation with the increase of SMA volume fraction. This means that the plasticity and strength of ASNMs can be significantly improved by adjusting the volume fraction of SMA. The fruits stem from this paper may provide a valuable guidance and theory route for the design of high-performance MGs.

中文翻译:

形状记忆合金对金属玻璃力学性能的影响:分子动力学研究

摘要 金属玻璃(MG)的强度-塑性权衡仍未得到有效克服。形状记忆合金(SMA)的引入是提高MG力学性能的有效途径。在这里,通过分子动力学(MD)模拟方法研究了非晶/SMA Cu64Zr36/B2-CuZr 纳米多层(ASNMs)在拉伸载荷下的变形行为。结果表明,无论 SMA 体积分数如何,ASNMs 的峰值应力和流动应力都大于整体 MG 的峰值应力和流动应力。SMA 相中的马氏体相变 (MT) 限制了剪切带 (SB) 的传播,避免了失控的不稳定性,同时诱导塑性应变强化。结果还表明,随着 SMA 体积分数的增加,ASNMs 的塑性变形模式从多个 SBs 的相互作用主导到最终由纳米孔聚集引起的脆性断裂。这意味着通过调整 SMA 的体积分数可以显着提高 ASNM 的塑性和强度。本文的成果可能为高性能MGs的设计提供有价值的指导和理论途径。
更新日期:2021-02-01
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