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| 铍铝合金室温拉伸及原位疲劳失效分析 | |
| 引用本文： | 王战宏,王莉,吴艳青,曲选辉.铍铝合金室温拉伸及原位疲劳失效分析[J].粉末冶金技术,2007,25(3):163-166. |
| 作者姓名： | 王战宏 王莉 吴艳青 曲选辉 |
| 作者单位： | 1. 北京科技大学材料科学与工程学院,北京,100083;西北稀有金属材料研究院,宁夏石嘴山,753000 2. 西北稀有金属材料研究院,宁夏石嘴山,753000 3. 清华大学工程力学系,北京,100084 4. 北京科技大学材料科学与工程学院,北京,100083 |
| 摘 要： | 通过室温拉伸试验和SEM原位疲劳测试,研究了金属型复合材料铍铝合金的拉伸性能及拉伸和原位疲劳的断裂机制.结果表明,合金在室温下具有较好的拉伸性能,且对应变速率有明显的敏感性.拉伸断裂是由脆性铍相的解理断裂和韧性铝相的延性断裂构成的混合型断裂.在拉拉疲劳载荷下,疲劳裂纹萌生于铍相颗粒,断裂模式仍由铍相的解理断裂和铝相的韧性断裂组成. |
| 关 键 词： | 铍铝合金 金属复合材料 原位疲劳试验 断裂 解理 |
| 收稿时间： | 2006-06-09 |
| 修稿时间： | 2006-06-09 |
Tensile test and SEM in situ fatigue failure analysis of beryllium-aluminum alloy at room temperature |
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| Wang Zhanhong,Wang Li,Wu Yanqing,Qu Xuanhui.Tensile test and SEM in situ fatigue failure analysis of beryllium-aluminum alloy at room temperature[J].Powder Metallurgy Technology,2007,25(3):163-166. | |
| Authors: | Wang Zhanhong Wang Li Wu Yanqing Qu Xuanhui |
| Affiliation: | 1School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083 ;2Northwest Rare Metal Materials Research Institute, Shizuishan Ningxia 753000, China;3 Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China |
| Abstract: | The tensile tests and SEM in situ fatigue observations have been conducted at room temperature to investigate the tensile properties and fracture mechanism of beryllium-aluminum metal matrix composite. The results show that Be-A1 alloy has satisfying tensile properties at room temperature and the tensile behaviors are sensitive to the strain speed. Fractographic analysis of the specimens reveal that the aluminum regions of the material fail in a ductile fashion, while the beryllium regions exhibit a brittle cleavage type failure. It is determined that the cracks initiate in the grain of beryllium and propagates to the aluminum matrix in SEM in situ fatigue process. The fatigue fracture mode is also composed of ductile type of aluminum and cleavage type of beryllium. |
| Keywords: | Be-Al alloy metal matrix composite in situ fatigue test fracture cleavage |
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