The role of calcium in microstructural refinement of AZ91 magnesium alloy

Liu Shengfa; Kang Liugen; Han Hui; Wang Zhongfan

doi:10.1007/BF02841202

Journal of Wuhan University of Technology Materials Science Edition ›› 2006, Vol. 21 ›› Issue (4) : 45 -47. DOI: 10.1007/BF02841202

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The role of calcium in microstructural refinement of AZ91 magnesium alloy

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Abstract

The effect of calcium addition on the microstructures of AZ91 magnesium alloy was investigated. It was found that a small amount of calcium in AZ91 alloy produced a large decrease in the α-Mg grain size and the dispersed fine β-Mg₁₇Al₁₂ phases. In addition, some Al₄ Ca particles were found to exist in the AZ91 alloy containing 0.5wt% Ca. EDS analysis and water-quenched technique revealed that the grain-refining mechanism of calcium for the AZ91 alloys was mainly attributed to the role of restricting growth of calcium in the primary α−Mg crystals.

Keywords

AZ91 magnesium alloy / calcium / microstructural refinement

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Liu Shengfa, Kang Liugen, Han Hui, Wang Zhongfan. The role of calcium in microstructural refinement of AZ91 magnesium alloy. Journal of Wuhan University of Technology Materials Science Edition, 2006, 21(4): 45-47 DOI:10.1007/BF02841202

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