Developing grain refinement and superplasticity in a magnesium alloy processed by high-pressure torsion
Developing grain refinement and superplasticity in a magnesium alloy processed by high-pressure torsion
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DOI：
10.1016/j.msea.2007.12.046
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发表时间：
2008-08-15
期刊：
影响因子：
6.4
通讯作者：
Langdon, Terence G.
中科院分区：
文献类型：
--
作者：
Kai, Masaaki;Horita, Zenji;Langdon, Terence G.
对Mg-9% Al合金进行了室温和423 K高压扭转（HPT）处理后的显微组织特征和高温拉伸性能的研究。通过在挤出和铸造条件下处理样品来实现超细晶粒尺寸。结果表明，使用HPT作为一种加工技术，实现显着的晶粒细化镁合金，不容易通过等通道转角挤压（ECAP）的可行性。在473 K的温度下的拉伸试验中实现了超塑性延展性，最大测量伸长率为810%。在一般情况下，更高的超塑性伸长率，实现后处理HPT在423 K，因为一些有限的内部裂纹的发展时，在室温下处理。(C)2008 Elsevier B. V.保留所有权利。
Experiments were conducted on a Mg-9% Al alloy to evaluate the microstructural characteristics and the tensile properties at elevated temperatures after processing by high-pressure torsion (HPT) at room temperature and at 423 K. Ultrafine grain sizes were achieved by processing samples in both an extruded and a cast condition. The results demonstrate the viability of using HPT as a processing technique for achieving significant grain refinement in magnesium alloys which are not processed easily by equal-channel angular pressing (ECAP). Superplastic ductilities were achieved in tensile testing at a temperature of 473 K with a maximum measured elongation of 810%. In general, higher superplastic elongations were achieved after processing by HPT at 423 K because of the development of some limited internal cracking when processing at room temperature. (C) 2008 Elsevier B.V. All rights reserved.