轧制温度对Mg-4Zn-1Mn-1.2Ce合金板材微观组织及力学/导热性能的影响  

Effect of Rolling Temperature on Microstructure Evolution and Mechanical/Thermal Properties of Mg-4Zn-1Mn-1.2Ce Alloy Sheet

作　　者：崔捷 李旭东 杜宪[1] 李淑波[1] 杜文博[1] CUI Jie;LI Xudong;DU Xian;LI Shubo;DU Wenbo(College of Materials Science and Engineering,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学材料科学与工程学院,北京100124

出　　处：《材料研究学报》2024年第9期641-650,共10页Chinese Journal of Materials Research

基　　金：国家重点研发计划(2021YFB3701100)。

摘　　要：将Mg-4Zn-1Mn-1.2Ce合金铸锭在不同温度轧制成板材,研究了轧制温度对其力学性能和导热性能的影响。结果表明:在轧制过程中,Mg-4Zn-1Mn-1.2Ce合金中的第二相Mg-Zn-Ce相(τ相)和α-Mn相破碎并沿轧制方向分布在基体中。轧制温度低于400℃时,轧制态合金以变形晶粒为主,轧制温度提高到425℃,道次间保温产生的静态再结晶使合金中再结晶的比例提高。轧制温度为375℃时轧制态Mg-4Zn-1Mn-1.2Ce合金的力学性能最优,其抗拉强度、屈服强度及延伸率分别为386 MPa、356 MPa和4.8%,热导率达到127.3 W·(m·K)^(-1)。退火处理使轧制态合金的强度略有降低,但是韧性有较大的改善。375℃轧制的合金经400℃退火60 min后,延伸率由轧制态的4.8%提高到23.5%;与轧制态相比,退火后合金的热导率下降4~9 W·(m·K)^(-1)。The effect of rolling temperature on microstructure evolution and mechanical/thermal properties of Mg-4Zn-1Mn-1.2Ce alloy was investigated.Results indicate that Mg-Zn-Ce(τphase)second phase andα-Mn were crushed and distributed along the rolling direction in the as hot-rolled Mg-4Zn-1Mn-1.2Ce alloy.When the rolling temperature was lower than 400℃,most grains became deformed grains,but the proportion of recrystallized grains increased due to the occurred static recrystallization during heat preservation in the intervals between rolling-passes when the plate was rolled at 425℃.The tensile strength,yield strength and elongation of the rolled Mg-4Zn-1Mn-1.2Ce alloy sheet were 386 MPa,356 MPa and 4.8%,respectively,as well as the thermal conductivity of 127.3 W·(m·K)^(-1) when it was hotrolled at 375℃.Annealing has resulted in a slight decrease in strength,but a great improvement in toughness.In the case of the alloy rolled at 375oC,its elongation increased from 4.8% to 23.5% after annealed at 400℃/60 min.Also,the thermal conductivity of the annealed alloy decreased about 4~9 W·(m·K)^(-1) in comparison with that of the as-rolled one.

关 键 词：有色金属及其合金 镁合金 热轧 退火 力学性能 导热性能 

分 类 号：TG146.22[一般工业技术—材料科学与工程]