Influence of preliminary extrusion conditions on the superplastic properties of a magnesium alloy processed by ECAP
Influence of preliminary extrusion conditions on the superplastic properties of a magnesium alloy processed by ECAP
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DOI：
10.1016/j.actamat.2006.09.027
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发表时间：
2007-02-01
期刊：
影响因子：
9.4
通讯作者：
Langdon, Terence G.
中科院分区：
文献类型：
--
作者：
Furui, Mitsuaki;Kitamura, Hiroki;Langdon, Terence G.
对Mg-8%两相Li合金在三种不同条件下的组织和性能进行了评价：铸造后；浇注后，在不同温度和速度下进行挤压；铸造、挤压、ECAP加工四道次，在室温下使用135度通道角的模具。结果表明，挤压引起了明显的晶粒细化，并且在ECAP中存在额外的细化。在拉伸试验中，随着挤压温度的降低，失效延伸率增加，但基本上与挤压速度无关。铸态延展性较低，挤压态延展性中等，挤压和ECAP后延展性较高。在最后一种条件下，在473 K的测试温度下获得了类似1780%的超高伸长率。结果表明，使用沟道角为135度的模具是有利的，因为它允许在晶粒生长受限的室温下进行压制。(C) 2006材料学报Elsevier Ltd.出版。版权所有。
The microstructures and properties of a two-phase Mg-8% Li alloy were evaluated in three different conditions: after casting; after casting followed by extrusion at different temperatures and speeds; and after casting, extrusion and processing by ECAP for four passes at room temperature using a die with a channel angle of 135 degrees. The results show extrusion introduces significant grain refinement and there is additional refinement in ECAP. In tensile testing, the elongations to failure increase with decreasing extrusion temperature, but are essentially independent of the extrusion speed. The ductilities are low in the cast condition, intermediate in the extruded condition and high after extrusion and ECAP. For the last condition, an exceptionally high elongation of similar to 1780% was achieved at a testing temperature of 473 K. It is shown that it is advantageous to use a die with a channel angle of 135 degrees because it permits pressing at room temperature where grain growth is limited. (C) 2006 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.