Effects of Shrinkage Porosity on Mechanical Properties of a Sand Cast Mg-Y-Re (WE54) Alloy

Ji Lin Li; Yue Qun Ma; Rongshi Chen; Wei Ke

doi:10.4028/www.scientific.net/MSF.747-748.390

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HomeMaterials Science ForumMaterials Science Forum Vols. 747-748Effects of Shrinkage Porosity on Mechanical...

Effects of Shrinkage Porosity on Mechanical Properties of a Sand Cast Mg-Y-Re (WE54) Alloy

Abstract:

The distribution of shrinkage porosities in sand cast Mg-Y-RE (WE54) alloy castings was characterized through density measurement and calculated by Archimedess principle. The effect of porosity on mechanical properties of sand cast WE54 alloy was investigated through tensile tests and microstructure observation. It was found that the shrinkage porosities distributed mainly in the middle of the plate where the liquid feeding was quite inconvenient. And the porosities were formed along grain boundaries when secondary phases formed at the end of solidification. Hardness tests showed that the vikers hardness declined linearly with increasing porosity volume fraction. While the tensile strength and nominal yield strength declined exponentially as the porosity volume fraction increased. Microstructure observation showed that the fracture cracks propagated along the grain boundaries where porosities and secondary phases gathering together in as-cast WE54 alloy. The tiny porosities distributed in the secondary phases were observed, which could reduce the tensile strength of cast specimens significantly. The heat treatment strengthening effects were significantly weakened by porosities, and even no heat treatment strengthening effect was detected when the porosity volume fraction was higher than 1%. The microstructure observation also proved that no heat treatment strengthening effect existed in samples containing porosities.

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Periodical:

Materials Science Forum (Volumes 747-748)

Pages:

390-397

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https://doi.org/10.4028/www.scientific.net/MSF.747-748.390

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Online since:

February 2013

Authors:

Ji Lin Li, Yue Qun Ma, Rongshi Chen, Wei Ke

Keywords:

Mechanical Property, Sand Cast, Shrinkage Porosity, WE54 Alloy

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