Equal Channel Angular Pressing of a Mg–3Al–1Zn Alloy with Back Pressure
Equal Channel Angular Pressing of a Mg–3Al–1Zn Alloy with Back Pressure
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DOI：
10.1002/adem.201000014
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发表时间：
2010-08
影响因子：
3.6
通讯作者：
Feng Kang;J. Liu;Jing Wang;Xiang Zhao
中科院分区：
文献类型：
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作者：
Feng Kang;J. Liu;Jing Wang;Xiang Zhao
挤压的Mg-3Al-1 Zn合金棒在200 °C下经由路线Bc在具有或不具有125 MPa背压的情况下经受1-4道次等通道转角挤压（ECAP）。强度和塑性显着增加后，ECAP与背压，这是在强烈的对比，没有背压的情况下，在延展性的显着改善是伴随着屈服强度从织构软化明显下降的ECAP。与无反压ECAP相比，反压ECAP后晶粒细化明显，（0002）极的主要织构组分发生分裂，出现散射强度峰。这主要是由于在反压作用下，新的滑移系被激活，同时动态再结晶增强所致。采用带背压的ECAP工艺提高Mg-3Al-1 Zn合金的强度和塑性，为满足该轻合金综合性能的工程要求提供了一条较好的途径。
An extruded Mg–3Al–1Zn alloy bar is subjected to 1–4 passes equal channel angular pressing (ECAP) with or without 125 MPa backpressure via route Bc at 200 °C. Both strength and ductility are significantly increased after ECAP with backpressure; this is in strong contrast to the case of ECAP without backpressure, where significant improvement in ductility is accompanied by obvious decrease in yield strength from texture softening. Compared to ECAP without backpressure, much enhanced grain refinement, and the split of the dominant texture component of (0002) pole were observed with scatter intensity peaks in the case after ECAP with backpressure. This turns out to be resulted mainly from the activation of new slip system together with enhanced dynamic recrystallization under the effect of backpressure. The improvement of both strength and ductility in Mg–3Al–1Zn alloy through ECAP with back pressure provides a better approach to meet the engineering requests on comprehensive performance of this light alloy.