Fatigue behaviors and microstructures in an extruded Mg-Al-Zn alloy

被引：22

作者：

Somekawa, Hidetoshi ^{[1
]}

Maruyama, Norio ^{[2
]}

Hiromoto, Sachiko ^{[2
]}

Yamamoto, Akiko ^{[2
]}

Mukai, Toshiji ^{[1
]}

机构：

[1] Natl Inst Mat Sci, Struct Met Ctr, Tsukuba, Ibaraki 3050047, Japan

[2] Natl Inst Mat Sci, Ctr Biomat, Tsukuba, Ibaraki 3050047, Japan

来源：

MATERIALS TRANSACTIONS | 2008年 / 49卷 / 03期

关键词：

magnesium alloy; fatigue; extrusion; microstructure; deformation twins;

D O I：

10.2320/matertrans.MRP2007292

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Tensile, compression and fatigue tests were carried out on a commercially extruded Mg-Al-Zn alloy having an average grain size of about 15 pm. The tensile and compression tests at room temperature showed that the yield strength in tension was much higher than that in compression. The lower yield strength in compression resulted from its texture. The effects of the mechanical anisotropy on the fatigue behavior and its deformed microstructure were also investigated under a stress ratio of R = 0.1 and -1. The fatigue strength, stress amplitude, at N = 10(7) cycles under R = -1 and 0.1 was about 120 and 90 MPa, respectively. The mechanical properties and the deformed microstructure observations indicated that the formation of deformation twins was related to the between maximum stress and the yield strength in tension and compression: the deformation twins were formed in the sample (maximum stress is higher than the yield strength) and showed no deformation twins in the sample (maximum stress is lower than the yield strength).

引用

页码：681 / 684

页数：4

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