High Cycle Fatigue Properties of Die-Cast Magnesium Alloy AZ91D with Addition of Different Concentrations of Cerium

稀土学报(英文版), 2006, 24(5): 591-595.

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1.Key Laboratory of Automobile Materials Ministry of Education, Jilin University, Changchun 130025, China;College of Materials Science and Engineering, Changchun University of Technology , Changchun 130012, China

2.Key Laboratory of Automobile Materials Ministry of Education, Jilin University, Changchun 130025, China

3.Key Laboratory of Automobile Materials Ministry of Education, Jilin University, Changchun 130025, China

4.Key Laboratory of Automobile Materials Ministry of Education, Jilin University, Changchun 130025, China

基金项目: 面向21世纪教育振兴行动计划（985计划） the Key Technologies Fifteen R & D Programme(2001BA311A07-2)

High Cycle Fatigue Properties of Die-Cast Magnesium Alloy AZ91D with Addition of Different Concentrations of Cerium

Keywords： die-cast magnesium alloy

The effect of addition of different concentrations of Ce on high-cycle fatigue behavior of die-cast magnesium al-loy AZ91D was investigated. Mechanical fatigue tests were conducted at the stress ratio of R = 0.1, and fatigue strength was evaluated using up-and-down loading method. The results show that the grain size of AZ91D alloy is remarkably refined, and the amount of porosity decreases and evenly distributes with the addition of Ce. The fatigue strength of AZ91D alloy at room temperature increases from 96.7 up to 116.3 MPa (1％ Ce) and 105.5 MPa (2％ Ce), respectively, at the number of cycles to failure, Nf = 1 × 107. The fatigue crack of AZ91D alloy initiates at porosities and inclusions, and propagates along grain boundaries. The fatigue striations on fractured surface appear with Ce addition. The fatigue fracture surface of test specimens shows mixed-fracture characteristics of quasi-cleavage and dimple.

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High Cycle Fatigue Properties of Die-Cast Magnesium Alloy AZ91D with Addition of Different Concentrations of Cerium

参考文献