挤压比对热挤压成型铝铁铜合金组织与拉伸性能的影响  

Effects of Extrusion Ratio on Microstructure and Tensile Properties of an Extruded Al-Fe-Cu Alloy

作　　者：黄珂[1,2] 郭磊[1,2] 杨伏良[1,2] 马凯[1,2] 刘鹏[1,2] 柳公器[3] 

机构地区：[1]中南大学材料科学与工程学院,长沙410083 [2]中南大学教育部有色金属材料科学与工程重点实验室,长沙410083 [3]金杯电工股份有限公司,长沙410083

出　　处：《机械工程材料》2015年第4期53-58,共6页Materials For Mechanical Engineering

基　　金：长沙市科技计划项目(K0902002-11)

摘　　要：采用热挤压成型工艺制备了Al-0.7Fe-0.2Cu-0.02B铝合金棒材,研究了挤压比对其显微组织和拉伸性能的影响。结果表明:合金在挤压变形过程中发生了动态再结晶,随着挤压比增大,再结晶晶粒细化,且分布得更加均匀;挤压变形后,铸态合金中的网状第二相Al6Fe转变为Al3Fe,随着挤压比增大,Al3Fe相逐渐细化并在晶界处聚集;随着挤压比从6增大到28,合金的抗拉强度从106.53 MPa增至122.67 MPa,屈服强度从78.88 MPa增至84.65 MPa;通过数据拟合得到挤压态合金屈服强度与平均晶粒尺寸的关系为σ0.2=63.8+77d-1/2。The effects of extrusion ratio on microstructure and tensile properties of Al-0.7Fe-0.2Cu-0.02 B aluminum alloy bars which were produced by hot extrusion were studied.The results show that dynamic recrystallization occurred during hot extrusion,with the increase of the extrusion ratio,the recrystallization grains became smaller and more uniform distribution.After extrusion,the second phase Al6 Fe transformed into Al3 Fe,and the Al3 Fe phase became small gradually and gathered at the grain boundaries with the increase of extrusion ratio.With the increase of extrusion ratio from 6to 28,the tensile strength increased from 106.53 MPa to122.67 MPa and the yield strength increased from 78.88 MPa to 84.65 MPa.The relationship between yield strengthσ0.2and mean grains size dof the extruded alloy obtained by data fitting wasσ0.2=63.8＋77d-1/2.

关 键 词：铝合金 挤压比 再结晶 晶粒尺寸 屈服强度 

分 类 号：TG379[金属学及工艺—金属压力加工]