High-Temperature Mechanical Behavior of Extruded Mg-Y-Zn Alloy Containing LPSO Phases

被引：86
作者：
Onorbe, Elvira [1 ]
Garces, Gerardo [1 ]
Dobes, Ferdinand [2 ]
Perez, Pablo [1 ]
Adeva, Paloma [1 ]
机构：
[1] CENIM CSIC, Natl Ctr Met Res, Dept Met Phys, Madrid 28040, Spain
[2] Acad Sci Czech Republ, Inst Phys Mat, Brno 61662, Czech Republic
来源：
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE | 2013年 / 44A卷 / 06期
关键词：
MAGNESIUM ALLOYS; CREEP-BEHAVIOR; DEFORMATION MECHANISM; SUPERPLASTIC FLOW; SOLID-SOLUTION; GRAIN-SIZE; MICROSTRUCTURE; EXTRUSION; EVOLUTION; STRENGTH;
D O I：
10.1007/s11661-013-1628-8
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The high-temperature mechanical behavior of extruded Mg97-3x Y-2x Zn (x) (at. pct) alloys is evaluated from 473 K to 673 K (200 A degrees C to 400 A degrees C). The microstructure of the extruded alloys is characterized by Long Period Stacking Ordered structure (LPSO) elongated particles within the magnesium matrix. At low temperature and high strain rates, their creep behavior shows a high stress exponent (n = 11) and high activation energy. Alloys behave as a metal matrix composite where the magnesium matrix transfers part of its load to the LPSO phase. At high-temperature and/or low stresses, creep is controlled by nonbasal dislocation slip. At intermediate and high strain rates at 673 K (400 A degrees C) and at intermediate strain rates between 623 K and 673 K (350 A degrees C and 400 A degrees C), the extruded alloys show superplastic deformation with elongations to failure higher than 200 pct. Cracking of coarse LPSO second-phase particles and their subsequent distribution in the magnesium matrix take place during superplastic deformation, preventing magnesium grain growth.
引用
收藏
页码：2869 / 2883
页数：15
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