High thermal stability of submicron grained Cu processed by asymmetrical rolling
High thermal stability of submicron grained Cu processed by asymmetrical rolling
复制标题
非对称轧制亚微米晶粒铜的高热稳定性
DOI：
10.1016/j.matdes.2016.05.084
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发表时间：
2016-09-05
影响因子：
8.4
通讯作者：
Xie, Chaoying
中科院分区：
文献类型：
--
作者：
Li, Wei;Shen, Yao;Xie, Chaoying
本文报道了对称轧制和非对称轧制Cu在不同温度下的组织演变，揭示了非对称轧制引起的组织均匀性和局部严重畸变组织的去除对提高热稳定性的重要作用。在总压下量相同的情况下，分别采用对称轧制和非对称轧制两种亚微米晶（SMG）铜。与温度相关的边界间距曲线显示，非对称轧制的Cu具有显著更高的热稳定性，明显晶粒粗化的起始温度比对称轧制的Cu高40 ℃。非对称轧制铜的热稳定性提高主要是由于非对称轧制铜的组织均匀性提高和局部严重畸变组织的消除，从而抑制了形核。我们的研究结果表明，使用不对称轧制，以提高大块SMG金属的热稳定性的可行性。(C)2016爱思唯尔有限公司版权所有
In this paper, we report themicrostructure evolutions of symmetrically and asymmetrically rolled Cu at different temperatures, and reveal an important role of asymmetry induced microstructure homogeneity and removal of local severely distorted structures on the enhancement of thermal stability. With the sametotal reduction of 90%, two kinds of submicron grained (SMG) Cuwere processed by symmetrical and asymmetrical rolling respectively. The temperature dependent boundary spacing curves show the asymmetrically rolled Cu has significantly higher thermal stability, with the onset temperature of obvious grain coarsening being 40 degrees C higher than that for symmetrical rolled Cu. The enhanced thermal stability of asymmetrically rolled Cu can be attributed to the retardation of nucleation mainly realized by the improvement in microstructure homogeneity and the removal of local severely distorted structures. Our results demonstrate the feasibility of using asymmetrical rolling to improve the thermal stability of bulk SMG metals. (C) 2016 Elsevier Ltd. All rights reserved.