Effect of heat treatment on diffusion, internal friction, microstructure and mechanical properties of ultra-fine-grained nickel severely deformed by equal-channel angular pressing
Effect of heat treatment on diffusion, internal friction, microstructure and mechanical properties of ultra-fine-grained nickel severely deformed by equal-channel angular pressing
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DOI：
10.1016/j.actamat.2014.08.064
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发表时间：
2015-01-01
期刊：
影响因子：
9.4
通讯作者：
Wilde, Gerhard
中科院分区：
文献类型：
--
作者：
Divinski, Sergiy V.;Reglitz, Gerrit;Wilde, Gerhard
通过等通道角挤压的严重塑性变形显示出在Ni中诱导特征超快扩散路径（Divinski等人，2011年）。热处理对这些路径的影响，这被认为是由变形改性的一般高角度晶界（GB）的代表，研究了精确的放射性示踪剂自扩散测量应用Ni-63同位素。热处理引起的自由体积的重新分布和残余杂质的偏析触发扩散路径的松弛。建立了GB扩散动力学、内耗、显微组织演变和显微硬度变化之间的关系，并进行了详细的分析。提出了形变晶界扩散增强的唯象模型。(C)2014 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
Severe plastic deformation via equal-channel angular pressing was shown to induce characteristic ultra-fast diffusion paths in Ni (Divinski et al., 2011). The effect of heat treatment on these paths, which were found to be represented by deformation-modified general high-angle grain boundaries (GBs), is investigated by accurate radiotracer self-diffusion measurements applying the Ni-63 isotope. Redistribution of free volume and segregation of residual impurities caused by the heat treatment triggers relaxation of the diffusion paths. A correlation between the GB diffusion kinetics, internal friction, microstructure evolution and microhardness changes is established and analyzed in detail. A phenomenological model of diffusion enhancement in deformation-modified GBs is proposed. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.