High Cycle Fatigue Behaviour of Magnesium Alloys

被引：55

作者：

Nascimento, L. ^{[1
]}

Yi, S. ^{[1
]}

Bohlen, J. ^{[1
]}

Fuskova, L. ^{[1
]}

Letzig, D. ^{[1
]}

Kainer, K. U. ^{[1
]}

机构：

[1] GKSS Res Ctr Geesthacht GmbH, MagIC Magnesium Innovat Ctr, D-21502 Geesthacht, Germany

来源：

FATIGUE 2010 | 2010年 / 2卷 / 01期

关键词：

Wrought magnesium alloy; high cycle fatigue; crystallographic texture; crack initiation; CRACK INITIATION MECHANISM; Y-ZR ALLOY; TEXTURE DEVELOPMENT; GRAIN-SIZE; REGIME; LIFE; AZ31; MG-3AL-1ZN; EXTRUSION; STRENGTH;

D O I：

10.1016/j.proeng.2010.03.080

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

The influence of crystallographic texture on fatigue failure mechanisms was studied by comparing the fatigue behaviour of two extruded magnesium alloys, AZ31 and ZN11. The microstructures and fracture surfaces of specimens were examined using scanning electron microscopy (SEM) to reveal the micromechanisms of fatigue crack initiation. The AZ31 alloy has an inhomogeneous grain structure and strong fibre texture, which cause strong asymmetry in the tensile and compressive yield strengths. This yield stress asymmetry is related to the high twinning activity under compressive loading. The metallographic investigation reveals that the cracks are mainly initiated at twin boundaries. On the other hand, a weak texture and fully recrystallised, homogeneous grain structure are found in the experimental alloy ZN11 after extrusion. As a consequence, twinning is suppressed and no yield stress asymmetry is observed. The fatigue failure of ZN11 is initiated by cyclic slip deformation. (C) 2010 Published by Elsevier Ltd.

引用

页码：743 / 750

页数：8

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