钪对Al-Zn-Mg-Cu-Zr合金组织性能的影响  

Effect of Sc Addition on Microstructures and Mechanical Properties of Al-Zn-Mg-Cu-Zr Alloys

作　　者：戴晓元[1] 夏长清[1] 刘昌斌[1] 

机构地区：[1]中南大学

出　　处：《稀有金属材料与工程》2006年第6期913-916,共4页Rare Metal Materials and Engineering

基　　金：国家重点基础研究发展规划项目(G1999064911-2)

摘　　要：研究了微量钪对Al-Zn-Mg-Cu-Zr合金组织性能的影响,钪在铝合金中主要以2种形式的化合物存在,一种是合金凝固时从熔体中析出的一次Al3(Sc,Zr)相,另一种是合金铸锭均匀化时析出的二次Al3(Sc,Zr)相,前者是α(Al)晶粒细化剂,有效细化铸态晶粒,而二次Al3(Sc,Zr)粒子强烈钉扎晶粒内位错及亚晶界,有效阻止热轧、退火或固溶处理过程中合金再结晶。钪是产生强烈析出强化效应的合金元素,含0.30%Sc的Al-Zn-Mg-Cu-Zr合金的抗拉强度和延性显著高于不加钪的铝合金。The effects of minor element Sc addition on the microstructures and mechanical properties of three kinds of Al-Zn-Mg-Cu-Zr alloys were studied. The minor element Sc mainly exists in two forms of compounds, one is the primary Al3（Sc, Zr） precipitated from the melt during solidification, the other is the secondary Al3（Sc, Zr） precipitated during homogenization. The former is the most effective grain refiner for a（Al） matrix and results in as-cast grain size refinement. The latter is coherent with the matrix, can strongly pin the sub-boundaries and effectively restrain the recrystallization of the alloys during hot rolled, annealing and solid solution. It is found that the Sc is one of the alloying elements that produce a very intensive precipitation hardening effect. Compared with the alloy without Sc addition, the Al-Zn-Mg-Cu-Zr ahoy with 0.30%Sc addition exhibits remarkable higher tensile strength and ductility.

关 键 词：含钪铝合金 显微组织 力学性能 

分 类 号：TG113[金属学及工艺—物理冶金]