Accumulative HPT of Zr-based bulk metallic glasses
Accumulative HPT of Zr-based bulk metallic glasses
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DOI：
10.1016/j.matlet.2019.127000
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发表时间：
2020-02-15
影响因子：
3
通讯作者：
Valiev, R. Z.
中科院分区：
文献类型：
--
作者：
Gunderov, D., V;Churakova, A. A.;Valiev, R. Z.
研究表明，对于大块金属玻璃的HPT，实际可实现的应变显著低于由方程γ = 2 π nR/h预测的应变。这种差异可以用HPT期间的“滑动”效应来解释。作者提出了一种新的方法-“累积HPT”-实现高应变的硬材料，包括BMG。在累积HPT过程中，样品经历几个循环：“HPT n = 1转->将样品切割成片->将堆叠的部件压在砧座上，随后HPT n = 1”。在最后一个阶段，堆叠的片段经受具有许多旋转（n >= 3）的HPT，由此样品被固结成单片盘。结果，材料通过挤压和扭转接收显著的总应变。本文介绍了Zr基BMG和结晶Zr基金属间化合物的“累积HPT”处理的第一结果。(C)2019爱思唯尔B. V.保留所有权利。
Studies show that with the HPT of bulk metallic glass, the actual achievable strain is significantly lower than the one predicted by the equation gamma = 2 pi nR/h. Such a discrepancy can be explained by the effect of "slippage" during the HPT. The authors proposed a new method - "accumulative HPT" - to achieve a high strain in hard materials, including BMGs. In the accumulative HPT procedure, a sample undergoes several cycles: "HPT n = 1 revolution -> cutting a sample into pieces -> pressing of stacked parts on the anvils and subsequent HPT n = 1". At the last stage, the stacked segments are subjected to HPT with many revolutions (n >= 3) whereby the sample is consolidated into a monolithic disk. As a result, the material receives a significant total strain by pressing and torsion. The article presents the first results of the "accumulative HPT" processing of a Zr-based BMG and a crystallized Zr-based intermetallic. (C) 2019 Elsevier B.V. All rights reserved.