期刊
METALS AND MATERIALS INTERNATIONAL
卷 22, 期 6, 页码 1055-1064出版社
KOREAN INST METALS MATERIALS
DOI: 10.1007/s12540-016-6385-y
关键词
twin roll casting; Mg alloy; texture; microstructure; VPSC; deformation
资金
- World Premier Materials (WPM) Program - Korea Ministry of Knowledge Economy
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning [2015R1A2A1-A01006795]
- International Research & Development Program of the National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning [2013K1A3A1A20047134]
- National Research Foundation of Korea [2013K1A3A1A20047134] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
In this study, the solidification and deformation behaviors in twin roll cast (TRC) Mg-6Al-X alloys have been investigated. The TRC simulation results showed that the AX60 alloy tended to have lower segregation while the AZ60 had the highest segregation due to the different solidification behavior and thermal properties. Compared to the as-cast microstructure, the segregation area was well matched with the melt to roll nip distance predicted in simulation. Mg alloys with Ca or Sr elements showed weaker textures when compared to A6 alloys rolled at 350 A degrees C. In addition, there was a significant change in (0002) pole figures from strong basal textures to random textures when the rolling temperature increased from 350 A degrees C to 450 A degrees C. This may be attributed to the non-basal slip system activity at high temperatures. The results of visco-plastic self-consistent simulation revealed that critical resolved shear stress of the tension twin increased with increasing rolling temperature. This led to tension twin 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. This means they were responsible for enhancing the formability and yield isotropy of Mg alloys.
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