稀土对时效-回归-再时效处理的Al-Zn-Mg合金硬度和氢脆的影响  

Effects of rare earths on hardness and hydrogen embrittlement of an aged-retrogressed-reaged Al-Zn-Mg alloy

作　　者：徐跃[1] 于文学[2] 郑伟涛[2] 赵竹第[2] 

机构地区：[1]吉林大学测试科学实验中心,长春130023 [2]吉林大学材料科学与工程学院材料科学系,长春130012

出　　处：《吉林大学学报（理学版）》2004年第4期578-581,共4页Journal of Jilin University:Science Edition

基　　金：国家自然科学基金(批准号:50372024);教育部高校青年教师基金(批准号:2002359).

摘　　要：将少量稀土元素添加到Al Zn Mg合金中进行时效 回归 再时效处理.利用扫描电子显微镜和X射线衍射对该合金的显微结构和沉淀相进行了观察和研究.结果表明,经过时效 回归 再时效处理后,稀土Al Zn Mg合金的晶粒尺寸减小,沉淀相MgZn2增加,同时,峰时效硬度和氢脆阻力增强.The effects of a small amount of rare earth (RE) elements added on the hardness and hydrogen embrittlement of an aged and retrogressed-reaging Al-Zn-Mg alloy were investigated. Scanning electron microscopy and X-ray diffraction were employed to study the microstructure and the precipitation phase of the alloy. The addition of RE improves the precipitation of a strengthing phase (MgZn_2) and decreases the grain size. By the addition of RE, the strength, hardness and elongation of the alloy at peak-aging can be improved, the hardness and hydrogen embrittlement resistance of the alloy after aged-retrogressed-reaged can be enhanced.

关 键 词：MG合金 时效处理 沉淀相 氢脆 硬度 稀土 晶粒尺寸 增强 添加 扫描电子显微镜 

分 类 号：N94-02[自然科学总论—系统科学] TG146[一般工业技术—材料科学与工程]