| AZ91系列压铸镁合金高周疲劳断口形貌分析 |
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| 引用本文： | 杨友,刘勇兵,杨晓红. AZ91系列压铸镁合金高周疲劳断口形貌分析[J]. 铸造, 2006, 55(2): 135-139 |
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| 作者姓名： | 杨友 刘勇兵 杨晓红 |
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| 作者单位： | 1. 吉林大学汽车材料教育部重点实验室,吉林,长春,130025;长春工业大学材料科学与工程学院,吉林,长春,130012
2. 吉林大学汽车材料教育部重点实验室,吉林,长春,130025 |
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| 基金项目： | 科技部专项基金;吉林大学校科研和教改项目 |
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| 摘 要： | AZ91D压铸镁合金中加入富Ce稀土后,组织得到明显细化,压铸过程中产生的气孔变小,分布更加均匀,能够减少疲劳裂纹源的产生。AZ91D合金拉伸断口表现为既有解理台阶又存在细小撕裂棱及韧窝的混合断裂特征,加入1?后,合金断口的韧性断裂特征增加,有利于提高合金的室温力学性能。AZ91D合金疲劳裂纹源萌生于合金内部的气孔和夹杂处,疲劳裂纹沿晶界扩展,加入稀土后,疲劳裂纹扩展区有疲劳辉纹出现,疲劳断裂呈现出准解理和韧窝断裂的混合特征。
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| 关 键 词： | 压铸镁合金 显微组织 拉伸断口 疲劳断口 |
| 文章编号： | 1001-4977(2006)02-0135-05 |
| 收稿时间： | 2005-10-24 |
| 修稿时间： | 2005-10-24 |
Analysis on High Cycle Fatigue Fracture Surface of AZ91 Series Die Cast Magnesium Alloys |
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| YANG YOu,LIU Yong-bing,YANG Xiao-hong. Analysis on High Cycle Fatigue Fracture Surface of AZ91 Series Die Cast Magnesium Alloys[J]. Foundry, 2006, 55(2): 135-139 |
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| Authors: | YANG YOu LIU Yong-bing YANG Xiao-hong |
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| Affiliation: | 1. Key Laboratory of Automobile Materials Ministry of Education, Jilin University, Changchun 130025, Jilin,China; 2. School of Materials Science and Engineering, Changchun University of Technology, Changchun 130012, Jilin, China |
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| Abstract: | The microstructure of AZ91D magnesium alloy is refined evidently with addition of rich-cerium rare earth.The gas hole is smaller and distribute even uniformly.The formation probability of fatigue crack initiation is decreased.The tensile fracture surface possess the mixed-rupture characteristics of cleavage step,minute lacerated ridge and tough dimple existence.The toughness fracture features of alloy tensile fracture surface are increased after addition 1?,which is in favor of improving the mechanical properties of alloys at room temperature.The fatigue crack of AZ91D alloy initiates at gas hole and inclusions of alloy inside.The fatigue crack propagates along the grain boundary.The fatigue lines appear in the fatigue crack propagation zones after addition rare earth.The fatigue fracture zone shows the mixed-rupture characteristics of quasi-cleavage and dimple. |
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| Keywords: | AZ91D |
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