In situ study on the compression deformation of MoNbTaVW high-entropy alloy
In situ study on the compression deformation of MoNbTaVW high-entropy alloy
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DOI：
10.1016/j.jallcom.2021.159557
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发表时间：
2021-08
影响因子：
6.2
通讯作者：
Congyan Zhang;B. Yue;U. Bhandari;Oleg N Starovoytov;Yan Yang;D. Young;Jinyuan Yan;F. Hong;Shizhong Yang
中科院分区：
文献类型：
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作者：
Congyan Zhang;B. Yue;U. Bhandari;Oleg N Starovoytov;Yan Yang;D. Young;Jinyuan Yan;F. Hong;Shizhong Yang
高熵合金（HEAs）具有优异的力学性能，使其成为推动科技进步的理想材料。然而，高压下塑性变形的机理还不十分清楚，迫切需要原位实验来提供高压下塑性变形的基本认识。利用同步辐射X射线衍射（XRD）技术研究了HEA MoNbTaVW在径向金刚石压砧（rDAC）中的压缩变形行为。我们的研究结果表明，强度和应力-剪切模量值的比值分别是纯钨（W）的约1.5倍和3倍。MoNbTaVW在5GPa以上表现出塑性变形，并显示出更强的织构。我们发现，在压缩下的MoNbTaVW高强度的主要原因是活跃的位错行为。这种独特的技术为研究其他类型HEAs的原位力学性能及其机理开辟了新的途径。
The excellent mechanical properties of high-entropy alloys (HEAs) make them promising materials for advances in science and technology. However, the underlying mechanism of plastic deformation is not well understood.In situexperiments are urgently required to provide a fundamental understanding of the plastic deformation under high pressure. We performedin situsynchrotron X-ray diffraction (XRD) experiments to study compression deformation behavior of the HEA MoNbTaVW in a radial diamond anvil cell (rDAC). Our results show that the strength and ratio of the stress-to-shear modulus values are ~1.5 and 3 times that of pure tungsten (W), respectively. MoNbTaVW showed plastic deformation above 5 GPa and displayed a much stronger texture. We found that the active dislocation behavior is mainly responsible for the high strength in MoNbTaVW under compression. This unique technique opens a new avenue to investigate thein situmechanical properties and their mechanism in other types of HEAs.