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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