Flame-Resistant Ca-Containing AZ31 Magnesium Alloy Sheets with Good Mechanical Properties Fabricated by a Combination of Strip Casting and High-Ratio Differential Speed Rolling Methods

다국어 초록 (Multilingual Abstract)

This study reported that a combination of strip casting and high-ratio differential speed rolling (HRDSR) canproduce flame-resistant Mg alloy sheets (0.7 wt%Ca-AZ31: 0.7Ca-AZ31) with good room-temperature mechanicalproperties and high-temperature formability. HRDSR effectively refined the coarse microstructure ofthe strip-casting processed 0.7Ca-AZ31 alloy. As the result, the (true) grain size was reduced to as small as2.7 꺷m and the (Mg, Al)2Ca phase was broken up to fine particles with an average sizes of 0.5 꺷m. Due to theadvantage of having such a highly refined microstructure, the HRDSR-processed 0.7Ca-AZ31 alloy sheetexhibited a high yield stress over 300 MPa and good superplasticity at elevated temperatures. The deformationmechanism of the fine-grained 0.7Ca-AZ31 alloy in the superplastic regime was identified to be grainboundary-diffusion or lattice-diffusion controlled grain boundary sliding.

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