LOW-CYCLE FATIGUE BEHAVIOR OF DIE-CAST Mg ALLOY AZ91

被引：0

作者：

Rettberg, Luke ^{[1
]}

Anderson, Warwick ^{[1
]}

Jones, J. Wayne ^{[1
]}

机构：

[1] Univ Michigan, Ann Arbor, MI 48109 USA

来源：

MAGNESIUM TECHNOLOGY 2011 | 2011年

关键词：

Low-Cycle Fatigue; Die-Cast AZ91; Strain-Life; Hysteresis Loops; Incremental Step Test; Cyclic Stress-Strain; Microstructure; Fractography; Porosity; MAGNESIUM ALLOYS;

D O I：

暂无

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

An investigation has been conducted on the influence of microstructure and artificial aging response (T6) on the low-cycle fatigue behavior of super vacuum diecast (SVDC) AZ91. Fatigue lifetimes were determined from total strain-controlled fatigue tests for strain amplitudes of 0.2%, 0.4% and 0.6%, under fully reversed loading at a frequency of 5 Hz. Cyclic stress-strain behavior was determined using incremental step test (IST) methods. Two locations in a prototype casting with different thicknesses and, therefore, solidification rates, microstructure and porosity, were examined. In general, at all total strain amplitudes fatigue life was unaffected by microstructure refinement and was attributed to significant levels of porosity. Cyclic softening and a subsequent increased cyclic hardening rate, compared to monotonie tests, were observed, independent of microstructure. These results, fractography and damage accumulation processes, determined from metallographic sectioning, are discussed.

引用

页码：61 / 66

页数：6

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