Effects of Si addition on microstructure and mechanical properties of RS/PM (rapid solidification and powder metallurgy) AZ91 alloy

被引：26

作者：

Sheng Shao-Ding ^{[1
]}

Chen Ding ^{[1
]}

Chen Zhen-Hua ^{[1
]}

机构：

[1] Hunan Univ, Coll Mat Sci & Engn, Changsha 410082, Hunan, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2009年 / 470卷 / 1-2期

关键词：

Rapid solidification; Magnesium alloys; Precipitated phases; Mechanical properties; MAGNESIUM ALLOYS; STRENGTH; COMPOSITE;

D O I：

10.1016/j.jallcom.2008.03.005

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

AZ91 alloy powder with 2 mass% Si addition (flakes) was obtained by two-roller quenching equipment with an atomized accessory. The powders were consolidated and extruded into bar. The microstructures of the powders (flakes) and bars were characterized by optical microscope (OM) XRD TEM and SEM. The results showed that the grain size of the powder were dendritic with the sizes of about 1-5 mu m. The as-extruded alloy bars retain equiaxed grains with a large number of precipitated phases, i.e. Mg2Si, beta-Al12Mg17 and AlMg2Zn. The alloy exhibits excellent mechanical properties. The 0.2% yield tensile strength, ultimate tensile strength and elongation of rupture were 322.47, 429.78 MPa and 6.4%, respectively. The as-extruded alloy bars show preferable elevated temperature mechanical properties. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：L17 / L20

页数：4

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