Mn添加对双辊铸轧6061铝合金组织和性能的影响  

Effect of Mn on Microstructure and Properties of Twin-Roll Casted 6061 Aluminum Alloy Plate

作　　者：王洪斌[1] 张新宇 李胜利[1] 徐振 宋华[2] 廉法博 陈星宇 Wang Hongbin;Zhang Xinyu;Li Shengli;Xu Zhen;Song Hua;Lian Fabo;Chen Xingyu(School of Materials and Metallurgy,University of Science and Technology,Anshan 114051,China;School of Mechanical Engineering and Automation,University of Science and Technology,Anshan 114051,China)

机构地区：[1]辽宁科技大学材料与冶金学院,辽宁鞍山114051 [2]辽宁科技大学机械工程与自动化学院,辽宁鞍山114051

出　　处：《稀有金属材料与工程》2021年第1期129-137,共9页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51874172);辽宁省自然科学基金(2019-ZD-0025);辽宁科技大学青年基金(2019QN09)。

摘　　要：研究了添加Mn对双辊铸轧6061铝合金铸轧板中富铁相转变及力学性能的影响。结合热力学模拟、金相显微镜(OM)、扫描电子显微镜(SEM)及透射电子显微镜(TEM)等手段分析6061铸轧板中富铁相转变及力学性能变化规律;利用室温拉伸试验机测试铸轧板力学性能。结果表明:当ω(Mn)=0.36%(质量分数)时6061铸轧板中富铁相完全由针状β-Al_(5)FeSi相转变为颗粒状α-Al_(12)(FeMn)3Si相,当ω(Mn)=0.54%时板材内部出现大量无规则块状与花瓣状α-Al_(15)(FeMn)_(3)Si_(2)相聚集,从而显著改善了铸轧板中富铁相形貌;当ω(Mn)=0.36%时,6061铸轧板力学性能最佳,此时抗拉强度、屈服强度和伸长率分别为195.93 MPa、170.36 MPa和17.96%。The effects on the microstructure and mechanical properties of twin-roll casted 6061 aluminum alloy plates with Mn addition were investigated.The microstructure of 6061 cast-rolled plates were analyzed by thermodynamic simulation,optical microscope(OM),scanning electron microscope(SEM)and transmission electron microscopy(TEM).The mechanical properties of 6061 cast-rolled plate with different Mn contents were tested using tensile tests.The results show that with the increase of Mn content of the 6061 cast-rolled plate,the iron-rich phase at the edge of 6061 cast-rolled plates is gradually transformed from acicularβ-Al_(5)FeSi phase to granularα-Al_(12)(FeMn)3Si phase,and a large number of irregular blocks and a petal-likeα-Al_(15)(FeMn)_(3)Si_(2)phase are aggregated in the core(ω(Mn)=0.54wt%);whenω(Mn)=0.36wt%,the mechanical properties of 6061 cast-rolled plate are the best.At this time,the tensile strength,yield strength and elongation of cast-rolled plates are 195.93 MPa,170.36 MPa and 17.96%,respectively.

关 键 词：双辊铸轧 6061铝合金 富铁相 微观组织 力学性能 

分 类 号：TG146.21[金属学及工艺—金属材料]