Mn添加对Al-Zr合金微观组织和性能的影响  

Effects of Mn Addition on Microstructure and Properties of Al-Zr Alloy

作　　者：陈保安 韩钰 王瑞红[3] 李梦琳 杨长龙 祝志祥 隋合轼 迟铖 马洪峰 Chen Baoan;Han Yu;Wang Ruihong;Li Menglin;Yang Changlong;Zhu Zhixiang;Sui Heshi;Chi Cheng;Ma Hongfeng(State Key Laboratory of Advanced Power Transmission Technology,State Grid Smart Grid Research Institute Co.,Ltd.;Department of Electrical Engineering New Materials,State Grid Smart Grid Research Institute Co.,Ltd.;School of Materials Science and Engineering,Xi'an University of Technology;Yingkou Electric Power Supply Company,State Grid Liaoning Electric Power Supply Co.,Ltd.)

机构地区：[1]国网智能电网研究院有限公司先进输电技术全国重点实验室 [2]国网智能电网研究院有限公司电工新材料研究所 [3]西安理工大学材料科学与工程学院 [4]国网辽宁省电力有限公司营口供电公司

出　　处：《特种铸造及有色合金》2023年第8期1111-1116,共6页Special Casting & Nonferrous Alloys

基　　金：国家电网有限公司总部科技项目(5500-202028257A-0-0-00)。

摘　　要：对比研究了Mn含量(0.16%,0.88%)对Al-0.18Zr合金铸态、轧制态和时效态微观组织、力学性能和电学性能的影响。结果表明,Mn抑制了铸态Al-0.18Zr合金中Al_(3)Zr纳米沉淀相的时效析出,其主要原因是Mn溶质原子与空位结合更紧密,通过捕获大部分过饱和空位,显著降低了Al3Zr相的形核析出。Al-0.18Zr合金在轧态下时效与铸态下时效相比,硬度略有降低,但是电导率明显提高。Mn含量为0.88%的Al-0.18Zr合金在轧态下时效,其硬度和电导率均远大于铸态下时效的性能;与轧态Al-0.18Zr合金相比,轧态Al-0.18Zr-0.88Mn合金时效后硬度提高了70%以上,表现出了较好的强化效果,而且热稳定性提升,在350℃下长时间热暴露后仍具有较高的硬度。Effects of Mn addition(0.16% and 0.88%)on microstructure,mechanical properties,electrical property of as-cast,as-rolled and as-aged Al-0.18Zr alloys were investigated comparatively.The results indicate that Al_(3)Zr nano-precipitation in as-cast Al-0.18Zr alloy is effectively inhibited by Mn,which is attributed to supersaturated vacancies captured by stronger bonding between Mn atoms and vacancies rather than promoting Al,Zr nucleation.Compared with that of as-cast Al-0.18Zr alloy,the hardness of as-rolled alloy is slightly reduced,while conductivity is increased significantly upon aging treatment.However,both the hardness and conductivity of as-rolled Al-0.18Zr alloy with 0.88% Mn addition are far greater than those of as-cast ones upon aging treatment.In comparison with as-rolled Al-0.18Zr alloy,the hardness of as-rolled Al-0.18Zr-0.88Mn alloy is raised by above 70% after aging treatment,presenting desirable strengthening effect with enhancement of thermal stability,and high hardness retains after heat exposure at 350℃ for long time.

关 键 词：Al-Zr合金 Mn添加 微观组织 力学性能 电导率 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG113.25[金属学及工艺—金属材料]