Al-Er-Zr/Hf合金析出相高温粗化行为  

High temperature coarsening behavior of precipitated phase in Al-Er-Zr/Hf alloy

作　　者：徐静 文胜平[1] 刘同辉[1] 王为[1] 聂祚仁[1] XU Jing;WEN Sheng-ping;LIU Tong-hui;WANG Wei;NIE Zuo-ren(College of Materials Science and Engineering, Beijing University of Technology, Beijing 100022, China)

机构地区：[1]北京工业大学材料科学与工程学院

出　　处：《材料热处理学报》2018年第6期62-67,共6页Transactions of Materials and Heat Treatment

基　　金：国家重点基础研究发展计划(973)基金(2012CB619503);国家自然科学基金(51201003)

摘　　要：将峰时效态Al-Er-Zr/Hf合金依次在450℃、500℃高温退火,探讨Al-Er-Zr/Hf合金析出相的高温粗化行为。结果表明：经450℃退火处理时,Al-Er-Zr/Hf合金硬度明显下降,电导率先下降后上升,且经450℃×100 h退火后的电导率高于峰时效态;再经500℃退火处理时,Al-Er-Zr/Hf合金的硬度及电导率变化均与450℃退火类似,但500℃×100 h退火后的Al-Er-Zr/Hf合金电导率值要低于500℃×100 h退火前;Al-Er-Zr/Hf合金中析出相的粗化过程符合LSW理论,其粗化过程主要受Zr、Hf原子扩散控制;Hf元素的添加能降低析出相的高温粗化速率,而且含量越多,效果越明显。The peak-aged state of Al-Er-Zr/Hf alloy was annealed at 450 ℃ and 500 ℃,and the high temperature coarsening behavior of precipitated phase in the Al-Er-Zr/Hf alloy was discussed. The results show that after annealing at 450 ℃,the hardness of the Al-Er-Zr/Hf alloy decreases obviously,while the electrical conductivity decreases first and then increases,and the electrical conductivity of the AlEr-Zr/Hf alloy annealed at 450 ℃ for 100 h is higher than that of the peak aged state. The variation of the hardness and electrical conductivity of the alloy annealed at 500 ℃ are similar to those of the alloy annealed at 450 ℃,but the electrical conductivity of the alloy annealed at 500 ℃ for 100 h is lower than that before annealing at 500 ℃ for 100 h. The size of precipitated phase is observed by TEM.The coarsening process of precipitated phase in the Al-Er-Zr/Hf alloys accords with LSW theory,and it is mainly controlled by the atomic diffusion of Zr and Hf. The addition of Hf element can reduce the the coarsening rate of the precipitated phase at high temperature,and the effect is more obvious with more Hf content.

关 键 词：Al-Er-Zr/Hf合金 时效 析出相 粗化 

分 类 号：TG146.2[一般工业技术—材料科学与工程]