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Prediction of Shrinkage Microporosity in Gravity-Cast and Low-Pressure Sand-Cast Mg-6Gd-3Y-0.5Zr Magnesium Alloys
Zhou, Bo; Wu, Di; Chen, Rongshi; Han, En-Hou
2019-11-23
Source PublicationADVANCED ENGINEERING MATERIALS
ISSN1438-1656
AbstractThe Niyama criterion and the dimensionless Niyama criterion are used to predict shrinkage microporosity in Mg-6Gd-3Y-0.5Zr magnesium plates processed by gravity casting and low-pressure sand casting. Instead of the Niyama evaluation condition recommended by commercial ProCAST software and precious studies, the most appropriate Niyama evaluation condition is suggested as fraction solid of 0.7 for the investigated alloys. With consideration of the actual distribution of shrinkage microporosity and the definition of unsound samples (shrinkage microporosity volume fraction is higher than 1% based on the tensile test), the corresponding threshold Niyama values are qualitatively determined as 0.44 and 0.3 degrees C-0.5 s(0.5) mm(-1) for gravity-cast and low-pressure sand-cast plates, respectively. It indicates that exerting pressure contributes to the decrease in the threshold Niyama value. In addition, exerting pressure can reduce the amount of shrinkage microporosity. For the dimensionless Niyama criterion, it is capable to quantitatively predict the shrinkage microporosity volume fraction in low microporosity-containing regions, but not in high microporosity-containing regions.
Keyworddimensionless Niyama criterion low-pressure sand castings Mg-6Gd-3Y-0 5Zr magnesium alloys Niyama criterion shrinkage microporosities
Indexed BySCI
Language英语
WOS IDWOS:000491834600001
PublisherWILEY-V C H VERLAG GMBH
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/80690
Collection中国科学院金属研究所
Recommended Citation
GB/T 7714
Zhou, Bo,Wu, Di,Chen, Rongshi,et al. Prediction of Shrinkage Microporosity in Gravity-Cast and Low-Pressure Sand-Cast Mg-6Gd-3Y-0.5Zr Magnesium Alloys[J]. ADVANCED ENGINEERING MATERIALS,2019.
APA Zhou, Bo,Wu, Di,Chen, Rongshi,&Han, En-Hou.(2019).Prediction of Shrinkage Microporosity in Gravity-Cast and Low-Pressure Sand-Cast Mg-6Gd-3Y-0.5Zr Magnesium Alloys.ADVANCED ENGINEERING MATERIALS.
MLA Zhou, Bo,et al."Prediction of Shrinkage Microporosity in Gravity-Cast and Low-Pressure Sand-Cast Mg-6Gd-3Y-0.5Zr Magnesium Alloys".ADVANCED ENGINEERING MATERIALS (2019).
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