Forging induces changes in the formability and microstructure of extruded Mg96Zn2Y2 alloy with a long-period stacking order phase

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:563

Article

Noda, Masafumi¹  Matsumoto, Ryo²  Kawamura, Yoshihito³ 

[1] Chiba Inst Technol, Dept Mech Sci & Engn, Narashino, Chiba 2750016, Japan

[2] Osaka Univ, Grad Sch Engn, Div Mat & Mfg Sci, Suita, Osaka 5650871, Japan

[3] Kumamoto Univ, Dept Mat Sci & Engn, Kumamoto 8608555, Japan

关键词: Magnesium alloy;    Forging;    Formability;    Microstructure;    Annealing;    Long-period stacking order phase;   

DOI  :  10.1016/j.msea.2012.11.072

来源: Elsevier

【 摘 要 】

We examined the effects of the processing temperature and the grain size on the ductility and flow stress of extruded Mg96Zn2Y2 (atom%) alloy by upsettability testing at various forging temperatures and for various grain sizes of the alpha-Mg phase. The extruded Mg96Zn2Y2 alloy showed a forging limit as a reduction in height of 65% at forging temperatures of 573-673 K and an initial strain rate of 3.5 x 10(-1) s(-1). The formability of LPSO-type Mg alloys can be improved by the production of an alpha-Mg phase with small grains and a LPSO phase with kink bands with a large-angle tilt. The hard LPSO phase has a bending angle of about 100 degrees at the grain boundaries and has a large deformability. Forging of about 10% is necessary for the formation of kink bands in the LPSO phase, and these kink bands deform continuously with increasing plastic deformation. (C) 2012 Elsevier B.V. All rights reserved.

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