Optimization of strength by microstructural refinement of MgY2Zn1 alloy during extrusion and ECAP processing
Optimization of strength by microstructural refinement of MgY2Zn1 alloy during extrusion and ECAP processing
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DOI：
10.1016/j.msea.2014.07.012
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发表时间：
2014-09-22
期刊：
影响因子：
6.4
通讯作者：
Adeva, P.
中科院分区：
文献类型：
--
作者：
Garces, G.;Munoz-Morris, M. A.;Adeva, P.
采用铸造、高温挤压和等径角挤压（ECAP）工艺制备了以Mg为基体、LPSO相含量约为19%的MgY2Zn1合金。挤压后，在挤压方向上获得细长的显微组织，其中LPSO相出现部分断裂，并且Mg基体部分再结晶至非常细的晶粒尺寸。在铸态和挤压态合金中进行的ECAP处理导致通过再结晶的进一步晶粒细化以及LPSO颗粒的进一步粉碎。通过不同的加工路线的合金的强度的增加已被分析的贡献从LPSO颗粒和变形和再结晶的晶粒在镁基体。(C)2014爱思唯尔有限公司版权所有。
A MgY2Zn1 alloy composed of a Mg matrix and about 19% of LPSO phase has been prepared by casting and further processing at high temperature by extrusion and equal channel angular pressing (ECAP). After extrusion an elongated microstructure was obtained in the direction of extrusion where the LPSO phase appears partially broken and the Mg matrix is partially recrystallized to very fine grain size. ECAP processing carried out both in the as-cast and extruded alloy leads to further grain refinement by recrystallization and also to further comminution of the LPSO particles. The increase in strength of the alloy by the different processing routes has been analysed in terms of the contributions from the LPSO particles and the deformed and the recrystallized grains in the magnesium matrix. (C) 2014 Elsevier B.V. All rights reserved.