热挤压对7055铝合金力学性能及组织的影响  

Effects of Hot Extrusion on Microstructure and Mechanical Properties of 7055 Aluminum Alloy

作　　者：张新[1,2] 陈利华[1] 王长顺[1] 毕泗元[1] 李宏伟[1] 王思涛[1] 隋国生[3] 

机构地区：[1]北京北方车辆集团有限公司工艺研究所 [2]北京有色金属研究总院有色金属材料制备加工国家重点实验室 [3]北京北方车辆集团有限公司铸造分公司

出　　处：《特种铸造及有色合金》2009年第12期1099-1101,共3页Special Casting & Nonferrous Alloys

摘　　要：采用挤压铸造成形工艺制备7055高强铝合金,研究了热挤压参数对合金力学性能及微观组织的影响,并与铸态下的力学性能及微观组织进行了对比。结果表明,热挤压态下的7055铝合金的微观组织和力学性能均优于铸态,并且晶粒随着比压的增加趋于细化,抗拉强度随着比压的增加趋于提高。当比压为75MPa时,在730℃温度下进行挤压浇注,经过双级固溶处理和时效后,合金的晶粒明显细化,抗拉强度达到681.4MPa,伸长率达到7.14%。Effects of hot extrusion parameters on mechanical properties and microstructure of the 7055 alloy were investigated by tensile testing and microstructural observation,and they are compared with those of as-cast ones.The results reveal that microstructure and mechanical properties of the hot extruded 7055 aluminum alloy are obviously superior to those of as-cast ones.Meanwhile,with increasing in specific pressure,grain size in the microstructure of the alloy is increasingly refined,and tensile strength is gradually improved.With extrusion casting at 730℃ and 75MPa,the grain size in the alloy after T6 heat treatment is refined obviously with tensile strength of 681.4MPa and elongation of 7.14%.

关 键 词：7055铝合金 热挤压 力学性能 微观组织 

分 类 号：TG379[金属学及工艺—金属压力加工]