Existing form and action mechanism of minor scandium and zirconium in Al-Cu-Mg alloy  

作　　者：姜锋 文康 蹇海根 蒋春丽 赵娟 蒋龙 

机构地区：[1]School of Materials Science and Engineering,Central South University

出　　处：《Journal of Central South University》2010年第1期19-23,共5页中南大学学报（英文版）

基　　金：Project(2005DFA50550) supported by International Science and Technology Cooperation Program of China;Project(2005CB623705) supported by the National Basic Research Program of China

摘　　要：In order to investigate the existing form and action mechanism of minor scandium （Sc） and zirconium （Zr） in AI-Cu-Mg alloy, microstructures of Al-4Cu-1Mg-Sc-Zr alloy under different conditions, including states of as-cast, homogenized, hot-rolled, as-solution and natural aged, were observed by scanning electron microscopy （SEM）, X-ray diffractometry （XRD） and transmission electron microscopy （TEM）. It is revealed that Sc and Zr are completely dissolved into the supersaturated solid solution in as-cast ingot, but grain refinement is not observed. Coffee-bean-like AI3（Sc, Zr） particles deposit during homogenization of ingot induce an increase in hardness. Al3（Sc, Zr） particles are slightly coarsened in as-solution samples, but they still maintain coherent to matrix, which indicates a high thermal stability of these particles. Good coherency ofAl3（Sc, Zr） particles makes some benefits for inhibiting recrystallization and reserving work-hardening.In order to investigate the existing form and action mechanism of minor scandium (Sc) and zirconium (Zr) in Al-Cu-Mg alloy, microstructures of Al-4Cu-1Mg-Sc-Zr alloy under different conditions, including states of as-cast, homogenized, hot-rolled, as-solution and natural aged, were observed by scanning electron microscopy (SEM), X-ray diffractometry (XRD) and transmission electron microscopy (TEM). It is revealed that Sc and Zr are completely dissolved into the supersaturated solid solution in as-cast ingot, but grain refinement is not observed. Coffee-bean-like Al3(Sc, Zr) particles deposit during homogenization of ingot induce an increase in hardness. Al3(Sc, Zr) particles are slightly coarsened in as-solution samples, but they still maintain coherent to matrix, which indicates a high thermal stability of these particles. Good coherency of Al3(Sc, Zr) particles makes some benefits for inhibiting recrystallization and reserving work-hardening.

关 键 词：AI-Cu-Mg-Sc-Zr alloy SC ZR existing form action mechanism 

分 类 号：TG146.21[一般工业技术—材料科学与工程]