Effect of microstructure on creep behaviour of cast Mg97Y2Zn1 (at.%) alloy

被引：53

作者：

Garces, G. ^{[1
]}

Onorbe, E. ^{[1
]}

Dobes, F. ^{[2
]}

Perez, P. ^{[1
]}

Antoranz, J. M. ^{[3
]}

Adeva, P. ^{[1
]}

机构：

[1] CENIM CS1C, Natl Ctr Met Res, Dept Met Phys, Madrid 28040, Spain

[2] Acad Sci Czech Republic, Inst Phys Mat, Brno 61662, Czech Republic

[3] Univ Politecn Madrid, Escuela Tecn Super Ingn Aeronaut, E-28040 Madrid, Spain

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2012年 / 539卷

关键词：

Mechanical characterization; Magnesium alloys; Casting; Creep; RESISTANT MAGNESIUM ALLOYS; PERIOD ORDERED STRUCTURE; Y-ZN ALLOYS; DEFORMATION-BEHAVIOR; SOLID-SOLUTION; GD ALLOYS; MG; STRENGTH; SUBSTRUCTURES; TEMPERATURE;

D O I：

10.1016/j.msea.2012.01.023

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The creep resistance of the Mg97Y2Zn1 (at.%) alloy in the as-cast condition and after a isochronal thermal treatment up to 560 degrees C is evaluated from 200 degrees C to 350 degrees C. The as-cast alloy shows a microstructure characterized by magnesium dendrites and a Long-Period Stacking Ordered Structure in the interdendritic regions. The heat treated alloy shows a fully lamellar structure within magnesium grains. In both cases, the stress dependence of the creep rate presents two different regions. For low temperature and/or high strain rates, the creep behaviour shows a high stress exponent (n = 11) and high activation energy. The alloy behaves as a metal matrix composite where the magnesium matrix transfers part of its load to the LPSO-phase. Moreover, the lamellar structure within the magnesium grains in the thermal treated alloy results in an additional barrier against creep deformation. At high temperature and/or low strain rates, creep is controlled by non-basal dislocation slip. The cast alloy showed higher creep resistance than the heat treated alloy at low stresses since the diffusion of Zn and Y atoms nucleate at Shockley partial dislocations inhibiting their movements. (C) 2012 Elsevier B.V. All rights reserved.

引用

页码：48 / 55

页数：8

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