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pISSN : 1598-706X / eISSN : 2288-8381


(논문)연구논문

한국주조공학회지 (19권5호 433-439)

Age Hardening and Microstructure in Rapidly Solidified Mg-Al-Si-xCa Alloys

급냉응고된 Mg-Al-Si-xCa 합금의 시효경화 및 미세조직

Wan-Chul Kim, Ji-Ha Park, Bong-Sun You*, Won-Wook Park*

Hongik University, *Korea Institute of Machinery & Materials

Abstract

Rapidly solidified Mg-Al-Si base alloys containing Ca were obtained by melt spinning. The melt- spun ribbons were aged isochronally or isothermally to investigate age hardening phenomena and microstructural change according to the alloy composition. Age hardening occurred after aging at 200℃ for 1h mainly due to the precipitation of Al₂Ca and Mg₂Ca, which have coherent interfaces with the matrix. With the increase of Ca content, the hardness values of the alloy ribbons were increased. Among the alloys, Mg-10Al-2 Si-3Ca alloy showed a good thermal stability at elevated temperature.

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