4.7 Article

Hot compression deformation behavior of Mg-9Gd-2.9Y-1.9Zn-0.4Zr-0.2Ca (wt%) alloy

期刊

MATERIALS CHARACTERIZATION
卷 124, 期 -, 页码 40-49

出版社

ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2016.11.036

关键词

Magnesium alloys; Rare earth (RE); LPSO phase; Processing map; Dynamic recrystallization

资金

  1. National Key Research and Development Program of China [2016YFB0301102]
  2. SPS KAKENHI [JP 16K18266]
  3. National Natural Science Foundation of China [51271063, 51571068]
  4. Grants-in-Aid for Scientific Research [16K18266, 15J12688] Funding Source: KAKEN

向作者/读者索取更多资源

Hot deformation behavior of the homogenized and quenched Mg-9Gd-2.9Y-1.9Zn-0.4Zr-0.2Ca (wt%) alloy was investigated by compression test at temperatures of 300 500 C and strain rates of 0.00110 s(-1). The flow stress is sensitive to the deformation temperature and strain rate, which increases with increasing strain rate and decreasing temperature. The processing map constructed at the strain of 0.9 shows two stability domains with high power dissipation efficiencies and the optimum hot working condition for the alloy is determined as deformation temperature of 450 C and strain rate of 0.01 s(-1), which correlates with the continuous dynamic recrystallization as main softening mechanism. However, dense lamellar-shaped long period stacking ordered (LPSO) phases precipitate inside original grains during preheating and deformation, which restrict the dynamic recrystallization. Consequently, dynamic recrystallization proceeds incompletely. Adiabatic shear bands and cracks formed at grain boundaries lead to the premature failure of the samples compressed at strain rate of 10 s(-1) in the instability domain where should be avoided during processing. (C) 2016 Elsevier Inc All rights reserved.

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