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- 저자 : Shouxun Ji (검색결과 2 건)
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Repeatability of Tensile Properties in High Pressure Die-Castings of an Al-Mg-Si-Mn Alloy
Hailin Yang,Shouxun Ji,Douglas Watson,Zhongyun Fan 대한금속·재료학회 2015 METALS AND MATERIALS International Vol.21 No.5
High pressure die-castings of an Al-Mg-Si-Mn alloy have been assessed in terms of the repeatability of the mechanical properties including yield strength, ultimate tensile strength and elongation by the normal standard deviations method and by the Weibull statistical model with three parameters. It was found that the round samples had the maximum Weibull modulus, indicating the best repeatability. The machined samples exhibited the second best of Weibull modulus. Among the square samples, the 2 mm and 5 mm thick samples had the lowest and the highest Weibull modulus respectively, indicating that the repeatability for the castings was influenced by the wall thickness. The microstructural uniformity and porosity levels are critical factors in determining the repeatability of the high pressure die-castings. A less segregation in the microstructure could uniform the stress distribution in the die-castings and a less porosity in the casting could reduce the sources for brittle fracture. These improved the repeatability in casting production.
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Melt Superheating on the Microstructure and Mechanical Properties of Diecast Al-Mg-Si-Mn Alloy
Wenchao Yang,Xinliang Yang,Shouxun Ji 대한금속·재료학회 2015 METALS AND MATERIALS International Vol.21 No.2
The application of aluminium alloys in automotive body structure is one of the main developments in recentyears. The increase of the mechanical properties of the ductile die-casting is one of the most critical topics forthe application. In this work, the effect of melt superheating on the morphology, size and distribution of α-Alphase and Fe-rich intermetallics, and on the mechanical properties of the Al-Mg-Si-Mn diecast alloy wasinvestigated. The results showed that the refined microstructure could be obtained through melt superheating. The volume fraction of dendritic α-Al phase and the Fe-rich intermetallic phase formed in the shotsleeve was significantly reduced, resulting in the refined microstructure. Overall, the melt superheatingcould improve the mechanical properties of the yield strength, ultimate tensile strength, and elongation ofthe diecast Al-Mg-Si-Mn alloy. And, the Fe-rich intermetallic phase formed in the shot sleeve with thecoarse compact morphology and formed in the die cavity with the fine compact particles were identifiedas the same α-Al12(Fe,Mn)3Si composition in the present experimental conditions, which was not affectedby the melt superheating.
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