镦粗压下量对Al-Zn-Mg-Cu铝合金锻件组织与性能的各向异性的影响  

Influences of upsetting reduction on microstructure and property anisotropy for Al-Zn-Mg-Cu aluminum alloy forgings

作　　者：彭振凌 黄兰萍[1,2] 王会平 马云龙 陈送义 焦慧彬[1,2,4] 杨振 陈康华 Peng Zhenling;Huang Lanping;Wang Huiping;Ma Yunlong;Chen Songyi;Jiao Huibin;Yang Zhen;Chen Kanghua(Science and Technology on High Strength Structural Materials Laboratory,Central South University,Changsha 410083,China;Collaborative Innovation Center of Advance Nonferrous Structural Materials and Manufacturing,Central South University,Changsha 410083,China;Beijing Institute of Astronautical Systems Engineering,Beijing 100076,China;Light Alloy Research Institute,Central South University,Changsha 410083,China)

机构地区：[1]中南大学轻质高强结构材料重点实验室,湖南长沙410083 [2]中南大学有色金属先进结构材料与制造协同创新中心,湖南长沙410083 [3]北京宇航系统工程研究所,北京100076 [4]中南大学轻合金研究院,湖南长沙410083

出　　处：《锻压技术》2018年第10期13-22,共10页Forging & Stamping Technology

基　　金：国家重点研发计划(2016YFB0300801);国家自然科学基金重大科研仪器设备研制专项(51327902)

摘　　要：为了制备高综合性能的超强铝合金锻件,通过硬度、电导率、力学拉伸和剥落腐蚀等测试,并结合多种显微组织观察（OM、SEM）手段,研究了最终道次的镦粗压下量对Al-Zn-Mg-Cu铝合金锻件组织与性能的各向异性的影响。结果表明：随着最终道次的镦粗压下量的增加,锻件综合力学性能基本不变,各向异性先减小后增大;抗腐蚀性能有所下降,各向异性增大,当最终道次的镦粗压下量为20%～40%时,锻件的强度和伸长率以及抗腐蚀性能的各向异性最小,此时得到的锻件综合性能最优。最终道次的镦粗压下量导致的晶粒形状大小的改变和第2相分布的变化是产生这种现象的主要原因。In order to produce ultra-high strength aluminum alloy forgings with high comprehensive properties,the influences of the ultimate upsetting reduction on microstructure and property anisotropy of Al-Zn-Mg-Cu aluminum alloy forgings were studied by hardness,electrical conductivity,mechanical tensile and exfoliation corrosion tests combining with various microstructure observation methods such as OM and SEM. The results show that with the increasing of the ultimate upsetting reduction,the comprehensive mechanical properties are basically unchanged,and the anisotropy is first reduced and then increased. However,the corrosion resistance property is decreased,and the anisotropy is increased. When the amount of the ultimate upsetting reduction is 20%-40%,the strength,elongation and corrosion resistance property of forgings are the least,and its comprehensive performance is optimal. Furthermore,the change in the grain shape and size and the change in the second phase distribution caused by the ultimate upsetting reduction are the main causes of this phenomenon.

关 键 词：铝合金 多向自由锻 镦粗压下量 力学性能 抗腐蚀性能 各向异性 

分 类 号：TG316.2[金属学及工艺—金属压力加工]