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논문 기본 정보

자료유형
학술저널
저자정보
Sang Jun Park (Seoul National University) Hwa Chul Jung (Seoul National University) Kwang Seon Shin (Seoul National University)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.22 No.6
발행연도
2016.1
수록면
1,055 - 1,064 (10page)

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초록· 키워드

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In this study, the solidification and deformation behaviors in twin roll cast (TRC) Mg-6Al-X alloys have beeninvestigated. The TRC simulation results showed that the AX60 alloy tended to have lower segregation while theAZ60 had the highest segregation due to the different solidification behavior and thermal properties. Comparedto the as-cast microstructure, the segregation area was well matched with the melt to roll nip distance predicted insimulation. Mg alloys with Ca or Sr elements showed weaker textures when compared to A6 alloys rolledat 350 °C. In addition, there was a significant change in (0002) pole figures from strong basal textures to randomtextures when the rolling temperature increased from 350 °C to 450 °C. This may be attributed to the non-basalslip system activity at high temperatures. The results of visco-plastic self-consistent simulation revealed thatcritical resolved shear stress of the tension twin increased with increasing rolling temperature. This led to tensiontwin suppression in compression, which were associated with enhancing the yield isotropy of Mg alloys. Furthermore, the relative activities of basal <a> slip in AX60 alloy were higher than the other Mg alloys. Thismeans they were responsible for enhancing the formability and yield isotropy of Mg alloys.

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