Al_xCrFeNiMn高熵合金的组织和性能
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摘要
采用水冷铜坩埚悬浮熔炼与铜模吸铸相结合的方法制备了直径为3mm的Al_xCrFeNiMn(x=0、0.25、0.5、0.75)系高熵合金,通过X射线衍射、光学显微镜、扫描电镜、室温压缩试验、硬度测试等探索了不同铝含量、热处理温度和时间对AlxCrFeNiMn系高熵合金微观组织及力学性能的影响。结果表明,铸态Al_xCrFeNiMn(x=0、0.25、0.5、0.75)系合金的塑性变形基本相近,保持在34%左右,且铸态Al_(0.75)CrFeNiMn高熵合金的显微硬度、规定塑性延伸强度与抗压强度分别为524.15HV0.3、765.86MPa与3236.69MPa;不同温度和时间的热处理结果表明:Al_(0.5)CrFeNiMn具有更为细小且分布均匀的等轴晶,获得硬度最大值729.37HV0.3,并保持较大的塑性变形(30.33%),具有优良的力学性能。
Five-element high entropy alloys Al_xCrFeNiMn( x = 0,0. 25,0. 5,0. 75) with diameter of 3 mm were prepared by a combined method of water cold copper crucible levitation melting and copper mould suction casting. The effects of different Al content,heat treatment temperature and time on the microstructure and mechanical properties of Al_xCrFeNiMn series high-entropy alloys were investigated by X-ray diffraction,optical microscopy,scanning electron microscopy,room temperature compression and hardness test. The results show that plastic deformation of as-cast Al_xCrFeNiMn( x = 0,0. 25,0. 5,0. 75) alloys is almost the same,which remains at about 34%; and the microhardness,specified plastic elongation strength and compressive strength of as-cast Al_(0.75)CrFeNiMn high-entropy alloy are 524. 15 HV0. 3,765. 86 MPa and 3236. 69 MPa,respectively. The results of heat treatment at different temperatures and time show that the Al_(0.5)CrFeNiMn alloy after heat treatment has a microstructure of finer equiaxed grains with uniform distribution,reaches the maximum hardness value of 729. 37 HV0. 3,maintains a large plastic deformation( 30. 33%),and has excellent mechanical properties.
Five-element high entropy alloys Al_xCrFeNiMn( x = 0,0. 25,0. 5,0. 75) with diameter of 3 mm were prepared by a combined method of water cold copper crucible levitation melting and copper mould suction casting. The effects of different Al content,heat treatment temperature and time on the microstructure and mechanical properties of Al_xCrFeNiMn series high-entropy alloys were investigated by X-ray diffraction,optical microscopy,scanning electron microscopy,room temperature compression and hardness test. The results show that plastic deformation of as-cast Al_xCrFeNiMn( x = 0,0. 25,0. 5,0. 75) alloys is almost the same,which remains at about 34%; and the microhardness,specified plastic elongation strength and compressive strength of as-cast Al_(0.75)CrFeNiMn high-entropy alloy are 524. 15 HV0. 3,765. 86 MPa and 3236. 69 MPa,respectively. The results of heat treatment at different temperatures and time show that the Al_(0.5)CrFeNiMn alloy after heat treatment has a microstructure of finer equiaxed grains with uniform distribution,reaches the maximum hardness value of 729. 37 HV0. 3,maintains a large plastic deformation( 30. 33%),and has excellent mechanical properties.
引文
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[2]范啟超. Al Fe CrNiCoCu系高熵合金及其复合材料组织及性能研究[D].哈尔滨:哈尔滨工业大学,2011.Fan Qichao. Research on microstructure and properties of Al Fe CrNiCoCu high entropy alloy and its based composites[D].Harbin:Harbin Institute of Technology,2011.
[3]隽永飞,李军,蒋云强,等.激光熔覆制备高熵合金涂层的研究进展[J].应用激光,2018,38(1):130-135.Jun Yongfei,Li Jun,Jiang Yunqiang,et al. Research progress of the preparation of high entropy alloy coatings by laser cladding[J].Applied Laser,2018,38(1):130-135.
[4]Yeh J W,Chen S K,Lin S J,et al. Nanostructured high-entropy alloys with multiple principal elements:Novel alloy design concepts and outcomes[J]. Advanced Engineering Materials, 2004, 6(5):299-303.
[5]Zhang Y,Zuo T T,Tang Z,et al. Microstructures and properties of high-entropy alloys[J]. Progress in Materials Science,2014,61:1-93.
[6]Shun T T,Du Y C. Age hardening of the Al0. 3CoCrFeNiC0. 1high entropy alloy[J]. Journal of Alloys and Compounds,2009,478(1/2):269-272.
[7]Zhang W,Liaw P K,Zhang Y. Science and technology in high entropy alloys[J]. Science China Materials,2018,61(1):2-22.
[8]唐群华,蔡建宾,吴桂芬,等.热处理对Al0. 5CoCrFeNiB0. 2高熵合金组织结构及力学性能的影响[J].铸造,2011,60(1):24-27.Tang Qunhua,Cai Jianbin,Wu Guifen,et al. Effects of heat treatment on microstructure and mechanical properties of Al0. 5CoCrFeNiB0. 2high entropy alloy[J]. Foundry,2011,60(1):24-27.
[9]谢志敏,饶湖常,王海燕,等.热处理对Fe CoCrNiMnC0. 1高熵合金组织结构与力学性能的影响[J].热加工工艺,2017,46(4):234-238.Xie Zhimin, Rao Huchang, Wang Haiyan, et al. Effects of heat treatment on microstructure and mechanical properties of Fe CoCrNiMnC0. 1high-entropy alloy[J]. Hot Working Technology,2017,46(4):234-238.
[10]俞波,陈晨,杜文栋,等.热处理工艺对CoCrCu0. 5Fe Ni Ti高熵合金微观结构及性能的影响[J].金属热处理,2019,44(4):161-165.Yu Bo,Chen Chen,Du Wendong,et al. Effect of heat treatment on microstructure and properties of CoCrCu0. 5Fe Ni Ti high entropy alloy[J]. Heat Treatment of Metals,2019,44(4):161-165.
[11] Munitz A,Salhov S,Hayun S,et al. Heat treatment impacts the microstructure and mechanical properties of Al CoCrFeNi high entropy alloy[J]. Journal of Alloys and Compounds,2016,683:221-230.
[12]Qiao J W,Wang Y F,Wang R Q,et al. Tailoring microstructures and mechanical properties of Al CoCrFeNiTi0. 3high entropy alloys by heat treatment[J]. Materials Science Forum,2013:745-746.
[13]谢红波,刘贵仲,郭景杰,等.添加Al对AlxFe CrCoCuTi高熵合金组织与高温氧化性能的影响[J].稀有金属,2016,40(4):315-321.Xie Hongbo,Liu Guizhong,Guo Jingjie,et al. Microstructure and high temperature oxidation properties of AlxFe CrCoCuTi high-entropy alloy with different Al contents[J]. Rare Metals,2016,40(4):315-321.
[14]Li B,Kun P,Hu A,et al. Structure and properties of Fe CoNiCrCu0. 5Alxhigh-entropy alloy[J]. Transactions of Nonferrous Metals Society of China,2013,23(3):735-741.
[15]李安敏,张喜燕. Al对Al-Cr-Cu-Fe-Ni高熵合金的组织与硬度的影响[J].热加工工艺,2008,37(4):26-28.Li Anmin,Zhang Xiyan. Effect of Al on microstructure and hardness of AlxCrCuFeNi high entropy alloy[J]. Hot Working Technology,2008,37(4):26-28.