等通道转角挤压Mg-3.52Sn-3.32Al合金的组织与力学性能（英文）
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摘要
采用等通道转角挤压(ECAP)Bc路径对固溶态Mg-3.52Sn-3.32Al合金分别挤压1、4和8道次。利用光学显微镜、扫描电子显微镜、透射电子显微镜和X射线衍射仪分析合金的组织和相组成,并测试了其室温拉伸性能。结果表明,经ECAP挤压后,固溶态合金组织中析出大量细小的Mg2Sn相和极少量的Mg17Al12相。随挤压道次增加,合金的综合力学性能先提高后降低。经4道次挤压后,合金的综合拉伸性能相对较佳,抗拉强度、伸长率和硬度HV9.8分别达到250 MPa、20.5%和613 MPa,较未ECAP时分别提高43.7%、105%和26.9%。经ECAP挤压的合金室温拉伸断口均呈韧性断裂。等通道转角挤压Mg-3.52Sn-3.32Al合金的力学性能受晶粒尺寸、析出相以及组织织构的共同影响。
The solutionized Mg-3.52 Sn-3.32 Al alloy was processed by equal channel angular pressing(ECAP) via route Bc for 1, 4, and 8 passes. The microstructure and phase composition of the alloy were analyzed by optical microscope, scanning electron microscopy, transmission electron microscopy and X-ray diffraction, and the room-temperature mechanical properties were measured. The results show that many fine Mg2 Sn particles and a few Mg17 Al12 phases precipitate in the alloy after ECAP. The mechanical properties first increase and then gradually decrease with increasing the extrusion passes. The alloy possesses better mechanical properties after ECAP for four passes, and the ultimate tensile strength, elongation and hardness HV9.8 increase to 250 MPa, 20.5% and 613 MPa, respectively, which are increased by 43.7%, 105% and 26.9% compared with that of the solutionized alloy, respectively. The room temperature fractograph of the ECAP processed alloy is a ductile-fractured morphology under tensile conditions. The mechanical properties of the ECAP processed Mg alloy depend on the grain size, precipitate and texture.
The solutionized Mg-3.52 Sn-3.32 Al alloy was processed by equal channel angular pressing(ECAP) via route Bc for 1, 4, and 8 passes. The microstructure and phase composition of the alloy were analyzed by optical microscope, scanning electron microscopy, transmission electron microscopy and X-ray diffraction, and the room-temperature mechanical properties were measured. The results show that many fine Mg2 Sn particles and a few Mg17 Al12 phases precipitate in the alloy after ECAP. The mechanical properties first increase and then gradually decrease with increasing the extrusion passes. The alloy possesses better mechanical properties after ECAP for four passes, and the ultimate tensile strength, elongation and hardness HV9.8 increase to 250 MPa, 20.5% and 613 MPa, respectively, which are increased by 43.7%, 105% and 26.9% compared with that of the solutionized alloy, respectively. The room temperature fractograph of the ECAP processed alloy is a ductile-fractured morphology under tensile conditions. The mechanical properties of the ECAP processed Mg alloy depend on the grain size, precipitate and texture.
引文
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25 Wang Lifei,Mostaed Ehsan,Cao Xiaoqing et al.Materials&Design[J],2016,89:1
2 Mordike B L.Materials Science and Engineering A[J],2002,324(1-2):103
3 Huang Zhenghua,Qi Wenjun,Xu Jing et al.Materials Research and Application[J],2014,8(4):221(in Chinese)
4 Pan Yu,Zhang Diantao,Tan Yuning et al.Acta Metallurgica Sinica[J],2017,53(10):1357(in Chinese)
5 Zhou Dianwu,Xu Shaohua,Zhang Fuquan et al.The Chinese Journal of Nonferrous Metals[J],2010,20(5):914(in Chinese)
6 Wang Feng,Sun Shijie,An Shuaijie.Transactions of Materials and Heat Treatment[J],2015,36(S1):72(in Chinese)
7 Zheng Liuwei,Wang Hongxia,Yin Yaopeng et al.Transactions of Materials and Heat Treatment[J],2016,37(6):61(in Chinese)
8 Kang Zhixin,Peng Yonghui,Kong Jing et al.Rare Metal Materials and Engineering[J],2012,41(2):215(in Chinese)
9 Ren Guocheng,Zhao Guoqun.Journal of Materials Engineering[J],2013,10:13(in Chinese)
10 Ehsan Mostaed,Mazdak Hashempour,Alberto Fabrizi et al.Journal of the Mechanical Behavior of Biomedical Materials[J],2014,37:307
11 Zhai Qiuya,Wang Zhiming,Yuan Sen et al.Journal of Xi'an University of Technology[J],2002,18(3):254(in Chinese)
12 Liu Chuming,Zhu Xiurong,Zhou Haitao.Phase Diagrams for Magnesium Alloys[M].Changsha:Central South University Press,2006:292(in Chinese)
13 Dai Yongnian.Binary Alloy Phase Diagrams[M].Beijing:Science Press,2009(in Chinese)
14 Wang Ling,Zhao Haofeng,Zhang Lu et al.Rare Metal Materials and Engineering[J],2011,40(S2):389(in Chinese)
15 Wang Ping,Li Jianping,Guo Yongchun et al.Journal of University of Science and Technology Beijing[J],2011,33(9):1116(in Chinese)
16 Zhang Shichang,Wei Bokang,Lin Hantong et al.The Chinese Journal of Nonferrous Metals[J],2001,11(S2):99(in Chinese)
17 Dean J A.Lange’s Handbook of Chemistry,15th Ed[M].New York:McGraw-Hill Press,1999
18 Robson J D,Henry D T,Davis B.Materials Science and Engineering A[J],2011,528(12):4239
19 Zhu Chengcheng,Ma Aibin,Jiang Jinghua et al.The Chinese Journal of Nonferrous Metals[J],2013,23(5):1331(in Chinese)
20 Li Xiao,Yang Ping,Li Jizhong et al.Chinese Journal of Materials Research[J],2010,24(1):1(in Chinese)
21 Chen Dong,Ren Yuping,Guo Yun et al.Trans Nonferrous Met Soc China[J],2010,20(7):1321
22 Park S S,Tang W N,You B S.Materials Letters[J],2010,64(1):31
23 Kang Zhixin,Peng Yonghui,Kong Jing et al.Rare Metal Materials and Engineering[J],2012,41(2):215(in Chinese)
24 KimW J,Hong S I,KimY S et al.Acta Materialia[J],2003,51(11):3293
25 Wang Lifei,Mostaed Ehsan,Cao Xiaoqing et al.Materials&Design[J],2016,89:1