钪、锆对 Al- Cu- Mg- Fe- Ni 系铝合金显微组织与力学性能的影响  

Effect of Scandium and Zirconium on Microstructures and Tensile Properties of Al Cu Mg Fe Ni Aluminum Alloy System

作　　者：肖于德[1] 黄龙坚 黎文献[1] 李松瑞[1] 马正青[1] 熊建民 朱焱 欧阳立斌 周国汉 

机构地区：[1]中南工业大学材料科学与工程系,长沙410083 [2]湖南省益阳稀土材料总厂,益阳413001

出　　处：《稀有金属》1999年第5期331-335,共5页Chinese Journal of Rare Metals

摘　　要：通过添加钪、锆， 调整铜量， 配制实验合金， 采用 Ｘ 射线衍射、透射电镜、扫描电镜、硬度测量、拉伸试验等手段研究了实验合金挤压棒材组织性能， 探讨了含钪、锆的 Ａｌ Ｃｕ Ｍｇ Ｆｅ Ｎｉ 系合金的强韧化机理。在２６１８ 铝合金中添加钪、锆使合金的组织性能得到了明显改善， 但钪、锆不宜过量。含钪、锆合金强韧化的原因在于， 一方面有 Ｌ１２ 型共格相 Ａｌ３（ Ｓｃ ， Ｚｒ） 生成， 起着有效的补充强化作用， 另一方面强化相 Ｓ′相细化和分布状况改观， 改变了裂纹萌生位置与扩展途径。Abstract: Microstructures and mechanical properties of extruded bars of testing alloys, which were prepared by adding scandium and zirconium and adjusting the content of copper, were investigated by means of X ray diffraction, transmission the electron microscopy (TEM), scanning electron microscopy (SEM), hardness measurement and tensile test. Strengthening and the toughening mechanism of Al Cu Mg Fe Ni aluminum alloys with scandium and zirconium was discussed. The results show that microstructures and mechanical properties of the alloys will be improved obviously after adding scandium and zirconium into AA2618 aluminum alloy, but it is unsuitable to add scandium and zirconium excessively. Strengthening and toughening of the alloys containing scandium and zirconium are mainly due to that, on the one hand the precipitation of the coherent Al 3(Sc,Zr) phase with L1 2 the structure the (fcc, a =0.4051 nm) leads to an effective complemental strengthening effect, on the other hand, finer size and the better distribution of the main phase S′ phase results in the change of the nucleating position and the expanding path of the rupture crack.

关 键 词：铝合金 钪 锆 沉淀强化 显微组织 力学性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程] V252.2[金属学及工艺—金属材料]