Crystallographic study of Al_3Zr and Al_3Nb as grain refiners for Al alloys  

Al_3Zr和Al_3Nb作为铝合金晶粒细化剂的晶体学研究(英文)

作　　者：汪锋 邱冬 刘峙麟 John TAYLOR Mark EASTON 张明星 

机构地区：[1]School of Mechanical and Mining Engineering, The University of Queensland [2]School of Physics and Materials Engineering, Monash University

出　　处：《Transactions of Nonferrous Metals Society of China》2014年第7期2034-2040,共7页中国有色金属学报（英文版）

基　　金：the Australian Research Council for funding support;the support of China Scholarship Council

摘　　要：The potency of Al3Zr and Al3Nb as grain refiners for Al alloys was investigated from a crystallographic point of view using the edge-to-edge matching （E2EM） model. The results show that both Al3Zr and Al3Nb have small values of interatomic spacing misfit and interplanar spacing mismatch with respect to Al. Furthermore, energetically favourable orientation relationships predicted by the model exist between Al and each of these two intermetallic phases. In the light of the edge-to-edge matching model predictions, it is suggested that both Al3Zr and Al3Nb are potent heterogeneous nucleation refiners for Al grains from the crystallographic point of view. The present crystallographic analysis provides a more reasonable explanation for the significant grain refinement obtained in the peritectic Al-Zr and Al-Nb alloys and also provides fresh insight into the understanding of the grain refinement mechanism of Al alloys.利用edge-to-edge matching模型从晶体学角度研究Al3Zr和Al3Nb两种金属间化合物作为铝合金晶粒细化剂的有效性。结果表明,Al3Zr和Al3Nb两种金属间化合物和铝之间的原子间距错配和面间距错配值都很小。此外,模型预测Al3Zr和Al3Nb两种金属间化合物与铝之间存在良好的晶粒取向关系。根据模型理论可以从晶体学角度证明这两种金属间化合物对铝合金是有效的晶粒异质形核细化剂。本晶体学研究为包晶铝合金Al-Zr和Al-Nb中出现的明显晶粒细化现象提供了合理解释,同时为理解晶粒细化机理提供了新方法。

关 键 词：Al alloy A3Zr Al3Nb grain refinement PERITECTIC CRYSTALLOGRAPHY E2EM model 

分 类 号：TG223[金属学及工艺—铸造]