Microstructure and mechanical properties of high strength die-casting Al-wMg-Si-Mn alloy

被引：46
作者：
Hu, Zuqi [1 ]
Wan, Li [1 ]
Wu, Shusen [1 ]
Wu, Han [1 ]
Liu, Xueqiang [1 ]
机构：
[1] Huazhong Univ Sci & Technol, State Key Lab Mat Proc & Die & Mould Technol, Wuhan 430074, Peoples R China
来源：
MATERIALS & DESIGN | 2013年 / 46卷
关键词：
High-pressure die casting; Aluminum alloys; Mechanical properties; Fatigue fracture; ALUMINUM-ALLOYS; BEHAVIOR; POROSITY; FE;
D O I：
10.1016/j.matdes.2012.10.020
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Die casting Al-Mg-Si-Mn alloy, with good strength and toughness, has a bright prospect for the mass production of automotive security components. Effects of magnesium content and age treatment on fatigue and mechanical properties of AlMgxSi2Mn (x = 5.7-7.2%) alloys are studied to broaden their application and improve mechanical properties further. Tensile and fatigue tests were conducted on as-cast and age treated (250 degrees C/1h) AlMg5.5Si2Mn samples. Microstructure and fracture surface of those alloys are analyzed by SEM, XRD, EDXS and optical microscope (OM). Results indicated that as the magnesium content varied from 5.7% to 7.2%, yield strength and hardness increased 11% and 9%, while elongation decreased dramatically from 8.31% to 4.52%, respectively. Ultimate tensile strength and yield strength of AlMg5.5Si2Mn alloy increased 14% and 29% respectively, after the age treatment. Fatigue limits increased from 57 MPa to 75 MPa with enhanced magnesium contents. Surface pores and plastic deformation are dominantly responsible for the failure. Microstructure of AlMgxSi2Mn alloy consists of alpha-Al, Mg2Si, beta-Al3Mg2 and a small amount of Al-15(Fe, Mn)(3)Si-2 particles distributed along the grain boundaries. (C) 2012 Elsevier Ltd. All rights reserved.
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页码：451 / 456
页数：6
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