Superplasticity-like creep behavior of coarse grained ternary Al alloys  

作　　者：乔军 E.M.TALEFF 

机构地区：[1]College of Materials Science and Engineering,University of Science and Technology Liaoning [2]Department of Mechanical Engineering,University of Texas at Austin

出　　处：《Transactions of Nonferrous Metals Society of China》2010年第4期564-571,共8页中国有色金属学报（英文版）

基　　金：Project(DMR-9702156)supported by the National Science Foundation of USA;Project(50801034)supported by the National Natural Science Foundation of China;Project(20060425)supported by the Scientific and Technological Research Key Lab Foundation of Liaoning Education Department

摘　　要：Enhanced tensile ductilities in coarse grained Al-Mg-Zn and Al-Mg-Fe materials were studied.The materials were Al-2Mg-5Zn,Al-3Mg-5Zn,Al-4Mg-5Zn,Al-3Mg-0.11Fe,Al-3Mg-0.27Fe,and Al-3Mg-0.40Fe.Tensile elongation-to-failure tests were conducted at constant cross-head speed and constant temperatures from 300 to 450℃.Strain rate change tests were conducted at a constant temperature from 300 to 450℃and in strain-rate range from 4.31×10-5to 1.97×10-2s-1.Experimental results show that over 100%ductilities are consistently achieved in these materials.This superplasticity-like behavior is rate-controlled by solute-drag creep.Although ternary Zn and Fe additions do not have an adverse effect on solute-drag creep and ductility,they increase stress exponent and its sensitivity to Mg content during solute-drag creep.Enhanced tensile ductilities in coarse grained Al-Mg-Zn and Al-Mg-Fe materials were studied.The materials were Al-2Mg-5Zn,Al-3Mg-5Zn,Al-4Mg-5Zn,Al-3Mg-0.11Fe,Al-3Mg-0.27Fe,and Al-3Mg-0.40Fe.Tensile elongation-to-failure tests were conducted at constant cross-head speed and constant temperatures from 300 to 450℃.Strain rate change tests were conducted at a constant temperature from 300 to 450℃and in strain-rate range from 4.31×10-5to 1.97×10-2s-1.Experimental results show that over 100%ductilities are consistently achieved in these materials.This superplasticity-like behavior is rate-controlled by solute-drag creep.Although ternary Zn and Fe additions do not have an adverse effect on solute-drag creep and ductility,they increase stress exponent and its sensitivity to Mg content during solute-drag creep.

关 键 词：Al-Mg alloys SUPERPLASTICITY solute-drag creep tensile ductility strain-rate sensitivity 

分 类 号：TG146.21[一般工业技术—材料科学与工程]