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The Potential Application of Hot Isostatic Pressing for Magnesium Alloys to Reduce Shrinkage Porosity

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Abstract

The shrinkage porosity of a Mg–6Gd–3Y–0.5Zr (wt%) alloy was reduced by hot isostatic pressing (HIP) in our previously reported study. However, regions of severe shrinkage porosity (large areas of interconnected shrinkage porosity) were still not compact after the HIP process. In this study, three kinds of magnesium alloys were investigated to evaluate the applicability of HIP for magnesium alloys with contents of varying shrinkage porosity and alloying elements. The results show that HIP is confirmed to be ineffective for alloys with regions of severe shrinkage porosity, which can be detected by radiography. In contrast, the tensile properties and consistency were enhanced by HIP in alloys that had nominal compact regions that appeared to be free of shrinkage porosity according to radiography but actually contained a small area of interconnected shrinkage porosity. This enhancement mainly results from shrinkage porosity closure. On the other hand, variations in alloying elements had a negligible influence on shrinkage porosity closure during the HIP process. The initial contents with shrinkage porosity are believed to be the key determining factor for the effectiveness of HIP for Mg alloys. This work illustrates the potential application of HIP to Mg alloys to further improve and ensure the consistency of mechanical properties in nominal compact castings.

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Acknowledgements

The authors gratefully acknowledge the financial supports from the National Natural Science Foundation of China (NSFC, Nos. 52171055, 51701218 and 51601193), the Natural Science Foundation of Liaoning Province (No. 2020-MS-004), State Key Program of National Natural Science of China (No. 51531002), National Key Research and Development Program of China (No. 2016YFB0301104).

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Author notes

  1. B. Zhou and D. Wu have contributed equally to this work.

Authors and Affiliations

  1. CAS Key Laboratory of Magnetic Materials and Devices, and Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, 315201, China

    B. Zhou & Y. Ding

  2. Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China

    B. Zhou, D. Wu & R. S. Chen

  3. University of Chinese Academy of Sciences, Beijing, 100049, China

    Y. Ding

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  1. B. Zhou
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  2. D. Wu
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  3. Y. Ding
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  4. R. S. Chen
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Correspondence to Y. Ding or R. S. Chen.

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Zhou, B., Wu, D., Ding, Y. et al. The Potential Application of Hot Isostatic Pressing for Magnesium Alloys to Reduce Shrinkage Porosity. Inter Metalcast 17, 447–454 (2023). https://doi.org/10.1007/s40962-022-00785-x

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  • DOI: https://doi.org/10.1007/s40962-022-00785-x

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