Structure and properties of ultra-fine grain Cu-Cr-Zr alloy produced by equal-channel angular pressing
Structure and properties of ultra-fine grain Cu-Cr-Zr alloy produced by equal-channel angular pressing
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DOI：
10.1016/s1359-6454(01)00437-2
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发表时间：
2002-04-19
期刊：
影响因子：
9.4
通讯作者：
Kopylov, VI
中科院分区：
文献类型：
--
作者：
Vinogradov, A;Patlan, V;Kopylov, VI
研究了等通道转角挤压(ECAP)工艺制备的直径160 nm超细晶(UFG)合金的组织、热稳定性和性能。重点研究了ECAP时效对该合金多功能热、电、力学性能的优化。为了阐明沉淀强化ECAP材料的塑性变形和断裂机理，研究了应变控制下的疲劳寿命和循环响应。结果表明，沉淀强化UFG结构无论在500℃高温下还是在室温循环载荷下都保持稳定。与传统的粗晶材料相比，疲劳寿命显著提高。注意到循环软化的出现，并从位错-粒子相互作用和疲劳过程中析出相的可能溶解两个方面讨论了循环软化的性质。(C)爱思唯尔科学有限公司出版的2002 Acta Materialia Inc.保留所有权利。
The structure, thermal stability and properties are investigated of a Cu-Cr-Zr alloy with ultra fine grains (UFG) of 160 nm diameter produced by severe plastic deformation through equal-channel angular pressing (ECAP). Special attention is paid to optimization of multi-functional thermal, electrical and mechanical properties of this alloy by aging after ECAP. Fatigue life and cyclic response under strain-controlled experiments are investigated aiming at clarification of mechanisms of plastic deformation and fracture in the precipitation hardened ECAP materials. It is shown that the precipitation strengthened UFG structure remains stable both under elevated temperatures as high as 500degreesC and under cyclic loading at room temperature. Substantial improvement of fatigue life is evidenced in comparison with conventional coarse-grain materials. The appearance of cyclic softening is noticed and its nature is discussed in terms of dislocation-particle interaction and possible dissolution of precipitates during fatigue. (C) 2002 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.