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| 交变应力下A356铝合金疲劳行为及微结构演变 | |
| 引用本文： | 刘晓山,何国求,范宋杰,张卫华. 交变应力下A356铝合金疲劳行为及微结构演变[J]. 材料导报, 2007, 21(10): 113-115 |
| 作者姓名： | 刘晓山 何国求 范宋杰 张卫华 |
| 作者单位： | 1. 同济大学材料学院金属基材料研究所,上海市金属功能材料开发应用重点实验室,上海,200092 2. 西南交通大学牵引动力国家重点实验室,成都,610015 |
| 基金项目： | 教育部科学技术研究项目，国家自然科学基金，国家重点实验室基金 |
| 摘 要： | 对处于交变应力下A356铝合金的单轴疲劳寿命以及变形行为进行了研究,并与单一应力加载下的加载情况进行了对比.发现先进行高应力加载后换用低应力加载将会显著延长合金的疲劳寿命.合金的循环应变值主要与合金的循环加载应力幅值有关.此外,利用透射电镜的方法观察了在不同循环加载历史条件下合金中微观结构的变化情况,尤其是位错以及位错带的演变规律.并发现了沉淀物附近的位错塞积现象. |
| 关 键 词： | 交变应力 A356合金 单轴疲劳 位错演变 |
Fatigue Behavior of A356 Aluminum Alloy under Cross-stress-loading and the Fatigue Microstructure Evolution |
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| LIU Xiaoshan,HE Guoqiu,FAN Songjie,ZHANG Weihua. Fatigue Behavior of A356 Aluminum Alloy under Cross-stress-loading and the Fatigue Microstructure Evolution[J]. Materials Review, 2007, 21(10): 113-115 | |
| Authors: | LIU Xiaoshan HE Guoqiu FAN Songjie ZHANG Weihua |
| Affiliation: | Institute for Metal-based Materials Research, School of Material Science and Engineering, Tongji University, Shanghai Key Lab. for AgeD of Metallic Functional Materials, Shanghai 200092; 2 National Power Traction Laboratory of Southwest Jiaotong University, Chengdu 610015 |
| Abstract: | The uniaxial fatigue life and deformation performance of A356 aluminum alloy under cross-stressloading is studied in this paper, which is compared with the single-stress-loading fatigue. The results indicated that the fatigue life would be extended with first loading at a high stress amplitude and then a low stress amplitude during the fatigue process. The cycled strain of the alloy is mainly related to the stress amplitude of cyclic loading. Still, the mi- crostructure of the alloy during different loading cycles is researched with the help of TEM, especially the evolution of the dislocation and dislocation bands during the fatigue process. Around the precipitates had many dislocations stacked. |
| Keywords: | cross-strss-loading A356 alloy uniaxial fatigue dislocation evolution |
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