The effect of severe plastic deformation on precipitation in supersaturated Al-Zn-Mg alloys
The effect of severe plastic deformation on precipitation in supersaturated Al-Zn-Mg alloys
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DOI：
10.1016/j.msea.2007.01.001
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发表时间：
2007-07-15
期刊：
影响因子：
6.4
通讯作者：
Langdon, T. G.
中科院分区：
文献类型：
--
作者：
Gubicza, J.;Schiller, I.;Langdon, T. G.
研究了等通道转角挤压（ECAP）对两种过饱和Al-Zn-Mg合金析出相组织演变的影响。结果表明，ECAP可获得超细晶粒，并有细分散的η相析出。结果表明，ECAP加工促进了析出过程，因为位错作为析出物的形核位置。在ECAP处理的合金中观察到球形析出物，而在未经ECAP处理的时效后也观察到长棒状析出物。计算结果表明，由析出相组织特征参数估算的屈服强度与力学试验结果吻合较好。(C)2007 Elsevier B. V.保留所有权利。
Experiments were conducted to examine the influence of equal-channel angular pressing (ECAP) on the development of precipitation microstructures in two supersaturated Al-Zn-Mg alloys. The results show that ECAP leads to an ultrafine grain size with finely dispersed eta precipitates. It is concluded that processing by ECAP promotes the precipitation processes because dislocations act as nucleation sites for precipitates. Spherical precipitates were observed in the alloys processed by ECAP whereas long rod-like precipitates were also observed after ageing without ECAP. Calculations show the yield strengths estimated from the characteristic parameters of the precipitation microstructure are in good agreement with the values determined by mechanical testing. (C) 2007 Elsevier B.V. All rights reserved.