Microstructure and mechanical behaviour of semi-solid die-casting AZ91D magnesium alloy
Microstructure and mechanical behaviour of semi-solid die-casting AZ91D magnesium alloy
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DOI：
10.1016/j.matlet.2006.09.007
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发表时间：
2007-05-01
影响因子：
3
通讯作者：
Zhang, Erlin
中科院分区：
文献类型：
--
作者：
Du, Xinghao;Zhang, Erlin
在铸态条件下对半固态压铸 (SSDC) 制备的 AZ91D 镁合金的显微组织和机械性能进行了表征。 SSDC合金表现出独特的微观结构，其特征是初生α-Mg球均匀分布在细小的次生α-Mg晶粒和β-Mg17Al12金属间化合物的基体中。断裂前已达到高极限拉伸强度和伸长率。扫描电镜（SEM）对断口样品纵断面显微组织的观察表明，裂纹主要源自共晶相的脆性断裂，导致延性Mg相界面脱聚，使断裂成为相当关键的事件。在此之前，基体中韧性α-Mg相的变形与初生α-Mg相的“拔出”相结合，为SSDC合金提供了一定的应变。 (c) 2006 Elsevier B.V. 保留所有权利。
Microstructures and mechanical properties of an AZ91D magnesium alloy prepared with semi-solid die-casting (SSDC) were characterized in as-cast conditions. The SSDC alloy exhibits a unique microstructure featuring primary alpha-Mg globules uniformly distributed in the matrix of fine secondary alpha-Mg grains and beta-Mg17Al12 intermetallic. High ultimate tensile strength and elongation have been achieved before fracture. Observations on the vertical-section microstructure of the fractured sample by scanning electron microscopy (SEM) show that the crack mainly originated from the brittle fracture of the eutectic phase causes the interface decohesion of the ductile Mg phase, making fracture a rather critical event. Before that, the deformation of ductile alpha-Mg phase in the matrix as well as the "pulling out" of primary alpha-Mg phase combines to provide the SSDC alloy a certain strain. (c) 2006 Elsevier B.V. All rights reserved.