电解低钛铝制备铝硅合金的疲劳裂纹扩展行为  

Fatigue Crack Growth Behavior in the Al-Si Alloys Prepared Using Electrolytic Low-titanium Aluminum

作　　者：岑昆[1] 王明星[2] 

机构地区：[1]信阳职业技术学院,河南信阳464000 [2]郑州大学物理工程学院,郑州450001

出　　处：《郑州大学学报（理学版）》2009年第3期43-49,共7页Journal of Zhengzhou University:Natural Science Edition

摘　　要：以工业纯铝、两种钛含量的电解低钛铝以及Al-5%Ti中间合金等为原料,制备了3种钛含量的Al-Si铸造铝合金.研究了加钛方式和钛含量对合金的微观组织、疲劳裂纹萌生及扩展行为的影响.结果表明,加钛方式和钛含量对合金的疲劳裂纹萌生抗力有一定影响.对于电解低钛铝制备合金,较高的钛含量使合金的微观组织更加细化,疲劳裂纹的萌生抗力较高;与电解低钛铝制备合金相比,纯铝制备合金的疲劳裂纹萌生寿命偏低.加钛方式对合金疲劳裂纹扩展性能的影响不明显,钛含量对Paris区疲劳裂纹扩展速率也没有明显影响,但在近门槛区,钛含量的影响较大,随着钛含量降低,合金的疲劳裂纹扩展阻力增加,门槛值上升.Three types of the Al-Si cast aluminum alloys containing different Ti content are prepared with pure aluminum,electrolytic low-titanium aluminum,Al-5% Ti master alloy and so on. The effects of adding Ti method and Ti content on the microstructure,the fatigue crack initiation and growth behavior of the testing alloys are investigated. The experimental results show that different adding Ti methods and Ti contents have some influence on the fatigue crack initiation resistance of the alloys. For the alloys prep...

关 键 词：电解低钛铝 AL-SI合金 疲劳裂纹扩展 

分 类 号：TG146.2[一般工业技术—材料科学与工程]