Texture development and its effect on mechanical properties of an AZ61 Mg alloy fabricated by equal channel angular pressing
Texture development and its effect on mechanical properties of an AZ61 Mg alloy fabricated by equal channel angular pressing
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DOI：
10.1016/s1359-6454(03)00161-7
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发表时间：
2003-06-27
期刊：
影响因子：
9.4
通讯作者：
Lee, JD
中科院分区：
文献类型：
--
作者：
Kim, WJ;Hong, SI;Lee, JD
研究了AZ61镁合金在等通道转角挤压（ECAP）过程中的显微组织和织构变化规律，并与力学性能进行了关联。ECAP有效地细化了挤压态AZ61镁合金的微观组织，反复ECAP挤压使挤压态AZ61镁合金原有的纤维织构解体，并逐渐形成新的织构。经过8道次B路径的ECAP后，屈服应力低于挤压态AZ61合金，表明由于晶粒细化，织构软化占主导地位。另一方面，当使用路线A时，8道次后屈服应力略微增加。这种结果主要是由于纹理的差异。当分别通过路线B（c）和路线A处理时，8遍后的主要纹理为（10（1）在条1上）[0（1）在条11上] +（10（1）在条2上）[（1）在条2上（1）在条0上]和（10（1）在条2上）[（1）在条2上（1）在条0上]。ECAP后拉伸塑性提高，且初始晶粒尺寸越大，ECAP对塑性的影响越显著。(C)2003 Acta Materialia Inc.由爱思唯尔科技有限公司出版。保留所有权利。
Microstructure and texture development of an AZ61 Mg alloy during equal channel angular pressing (ECAP) was investigated and correlated with the mechanical properties. The microstructure was effectively refined by ECAP, and the original fiber texture of the extruded AZ61 alloy was disintegrated and a new texture was gradually developed by repetitive ECAP pressing. After 8 ECAP passes following route B,, the yield stress is lower than for the as-extruded AZ61 alloy, indicating that the texture softening is dominant over the strengthening due to grain refinement. When route A was used, on the other hand, the yield stress slightly increased after 8 passes. This result is primarily due to a difference in texture. The dominant textures after 8 passes were (10 (1) over bar1) [0 (1) over bar 11] +(10 (1) over bar2) [(1) over bar2 (1) over bar0] and (10 (1) over bar2) [(1) over bar2 (1) over bar0] when processed by route B(c) and route A, respectively. Tensile ductility increased after ECAP and the effect of ECAP on ductility is more remarkable when the initial grain size is large. (C) 2003 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.