Squeeze Cast Mg-Al-Sr AlloyS: Tensile Properties and Microstructure
Despite of the great potential of die cast Mg-Al-Sr alloys for high temperature automotive applications, cast Mg-Al-Sr alloys are not trouble free. The capability of squeeze casting to eliminate the inherent defects of alloys such as hot cracking and porosity has recently been demonstrated. In this study, the effect of strontium content on the microstructure and tensile properties of squeeze cast Mg-Al-Sr alloy was investigated. Three different strontium contents, 0, 1. 5 and 3.0 wt.％, were added to Mg-6 wt.％ Al alloy (AM60 alloy). The prepared alloys were squeeze cast under an applied pressure of 30 MPa. The results of tensile testing indicate that the ultimate tensile strength (UTS) , yield strength (YS) and elongation (Ef) as well as strAln hardening rates of the squeeze cast Mg-Al-Sr alloy decrease with increasing strontium content. Microstructural analysis indicates that Sr content influences a number of phases present in the squeeze cast Mg-Al-Sr alloys. Also, Sr addition decreases the grAln size of the alloys with increasing the strontium content. However, the increase in porosity levels by Sr addition beyond 0.5 wt.％ , which seems to offset its grAln refinement effect, should be responsible for the decrease in tensile properties and strAln hardening rates of the alloys squeeze cast under a moderate level of the applied pressure.
Squeeze Casting Magnesium Strontium Addition and Tensile Properties
Henry Hu Qiang Zhang Shuping Wang
Mechanical, Automotive & Materials Engineering, University of Windsor,401 Sunset Ave. , Windsor, Ont Ryobi Die Casting (USA) , Inc. Shelbyville, Indiana,USA46176 - 9720
国际会议
69th World Foundry Congress(第69届世界铸造会议 WFC 2010)
杭州
英文
868-872
2010-10-16（万方平台首次上网日期，不代表论文的发表时间）