4.7 Article

Deformation behaviors of twin roll cast Mg-Zn-X-Ca alloys for enhanced room-temperature formability

Publisher

ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2016.10.046

Keywords

Twin roll casting; Mg alloy; Texture; Microstructure; VPSC

Funding

  1. World Premier Materials (WPM) Program - Korea Ministry of Knowledge Economy
  2. Basic Science Research Program through the National Research Foundation of Korea (NRF) grant - Korea government (MEST) [2015R1A2A1A01006795]
  3. International Research & Development Program of the National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning [2013K1A3A1A20047134]
  4. National Research Foundation of Korea [2015R1A2A1A01006795, 2013K1A3A1A20047134] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

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Formability and viscoplastic self-consistent simulations of Mg-4Zn-X-Ca alloys were carried out in an effort to understand the relationship between deformation behaviors and room-temperature formability. The micro structural, textural and mechanical properties of Mg-4Zn-X-Ca alloys were also investigated. All of the alloys showed a sound twin roll cast microstructure without the occurrence of inverse segregation. Annealed Z4 and ZSX400 alloys exhibited strong basal textures; however, the other Mg alloys showed weaker basal textures with splitting in the transverse direction resulting from their different types of static recrystallization. Among the Mg-4Zn-X-Ca alloys, the ZAX400 alloy exhibited a high yield strength value of 189.3 MPa and excellent formability of 7.5 mm with enhanced yield isotropy, comparable to those of Al alloys. The higher formability values of the Mg-4Zn-X-Ca alloys were closely related to the modified deformation behaviors resulting from the texture evolution. The ZX40, ZAX400, ZWX400 and ZCX400 alloys, which were more formable, had higher relative activity of the basal < a > slip upon compression deformation, thus improving the yield isotropy. However, the Z4 and ZSX400 alloys in this study, had relatively low activity of the basal < a > slip in compression modes, as caused by their different CRSS ratios (tension twin/basal < a > slip).

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