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。
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.
出处
《粉末冶金技术》
EI
CAS
CSCD
北大核心
2007年第3期163-166,共4页
Powder Metallurgy Technology
基金
国防科工委资助项目
关键词
铍铝合金
金属复合材料
原位疲劳试验
断裂
解理
Be-Al alloy
metal matrix composite
in situ fatigue test
fracture
cleavage
作者简介
王战宏（1968-），男，高级工程师。E—mail：zhwang4289@hotmail．com
曲选辉（1960-），男，教授，主要从事粉末冶金新材料和新技术研究。E—mail：quxh@mater．ustb．edu.cn
