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


한국주조공학회지 (15권3호 252-261)

Coarsening Behavior of Fine Precipitates in Rapidly Quenched Al-Fe Based Alloy Ribbons by In-situ Heat Treatment

급랭응고한 Al-Fe 합금계 리본을 고온에 노출시킴에 따른 미세석출물의 성장거동

Nam-lk Baik

Sun Moon University


The purposes of this study were to investigate the microstructural changes in alloy ribbons of Al-Fe-Mo-Si quarternary system at 450~500℃, and to study the coarsening mechanism of fine precipitates. Using the hot stage in TEM, in situ microstructural changes in Al-4Fe-0.5Mo-1.5Si alloy ribbon and Al-8Fe-2Mo-1.5Si alloy ribbon have been examined successively up to 60 hours at 450℃ and 500℃. Cell structure in zone B of Al-4Fe-0.5Mo-1.5Si alloy ribbon was observed to collapse even in 10 minutes by in-situ heating at 450℃ and the size of precipitates in zone B increased twice in 60 hours. The precipitates in zone A of Al-4Fe-0.5Mo-1.5Si alloy ribbon showed slower coarsening rate than those in zone B by in-situ heating at 450℃. The precipitates in zone A of Al-8Fe- 2Mo-1.5Si alloy ribbon increased 50% by in-situ heating at 500℃ in 50 hours compared to the initial precipitates while any microstructual change in zone B was not observed by in-situ heating at 500℃ up to 50 hours. Only the precipitates in zone A of Al- 4Fe-0.5Mo-1.5Si alloy ribbon satisfied r^3∝t relationship of coarsening mechanism.