上引-连续挤压法制备Cu-Cr-Ag合金的组织与性能
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摘要
采用扫描电子显微镜(SEM)、透射电子显微镜(TEM)等分析测试手段系统研究不同热处理工艺制度对上引-连续挤压法制备Cu-Cr-Ag合金微观组织性能的影响规律。结果表明,上引连铸Cu-Cr-Ag合金棒坯经连续挤压过程中合金发生了强烈的剪切变形,晶粒破碎明显,其晶粒平均尺寸为4～5μm。挤压后合金经60%冷轧,875℃固溶1h,60%冷轧,450℃时效不同时间后,其维氏硬度与时效时间的关系呈先下降后上升再下降的趋势,而导电率与时效时间的关系呈先快速上升后缓慢增加最后趋于稳定的趋势。固溶冷变形后合金在450℃时效的析出序列为过饱和固溶体→G.P区→fcc Cr相→有序化→bcc Cr相,且bcc Cr相与基体的取向关系呈N-W关系,即(110)_(Cr)//(111)_(Cu),(001)_(Cr)//(111)_(Cu),[110]_(Cr)//[112]_(Cu)。
The effects of aging treatment on microstructure and properties of Cu-Cr-Ag alloy fabricated by up-drawn continuous casting and continuous extrusion were investigated by scanning electron microscopy(SEM) and transmission electron microscopy(TEM). The results show that the grains are refined significantly, with an average size of 4～5 μm, when the cast rob was processed during the continuous extrusion. The Vickers hardness firstly decreases rapidly, then raises quickly, finally decreases slowly and the electrical conductivity firstly increases rapidly, then raises slowly, finally trends to stable as the aging time rising, when the Cu-Cr-Ag alloy was solutioned at 875 ℃ for 1 h, 60% cold deformation and aged at 450 ℃ for different time. The precipitation sequence of Cu-Cr-Ag alloy aged at 450 ℃ is supersaturated solid solution→G.P zones→fcc Cr phase→order fcc Cr phase→bcc Cr phase. The orientation relationship between bcc Cr precipitates and the matrix exhibits NW-OR, i. e.(110)_(Cr)//(1 11)_(Cu),(001)_(Cr)//(1 11)_(Cu), [110]_(Cr)//[112]_(Cu).
The effects of aging treatment on microstructure and properties of Cu-Cr-Ag alloy fabricated by up-drawn continuous casting and continuous extrusion were investigated by scanning electron microscopy(SEM) and transmission electron microscopy(TEM). The results show that the grains are refined significantly, with an average size of 4～5 μm, when the cast rob was processed during the continuous extrusion. The Vickers hardness firstly decreases rapidly, then raises quickly, finally decreases slowly and the electrical conductivity firstly increases rapidly, then raises slowly, finally trends to stable as the aging time rising, when the Cu-Cr-Ag alloy was solutioned at 875 ℃ for 1 h, 60% cold deformation and aged at 450 ℃ for different time. The precipitation sequence of Cu-Cr-Ag alloy aged at 450 ℃ is supersaturated solid solution→G.P zones→fcc Cr phase→order fcc Cr phase→bcc Cr phase. The orientation relationship between bcc Cr precipitates and the matrix exhibits NW-OR, i. e.(110)_(Cr)//(1 11)_(Cu),(001)_(Cr)//(1 11)_(Cu), [110]_(Cr)//[112]_(Cu).
引文
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[2]Chbihi A,Sauvage X,Blavette D.Acta Materialia[J],2012,60(11):4575
[3]Singh R P,Lawley A,Friedman S.Materials Science and Engineering A[J],1991,145(2):243
[4]Correia J B,Davies H A,Sellars C M.Acta Materialia[J],1997,45(1):177
[5]Huang Fuxiang,Ma Jusheng,Ning Honglong et al.Scripta Materialia[J],2003,48(1):97
[6]Hatakeyama M,Toyama T,Yang J et al.Journal of Nuclear Materials[J],2009,386-388:852
[7]Komen Y,Rezek J.Metallurgical Transaction A[J],1975,6:549
[8]Morris M A,Morris D G.Acta Metallurgica[J],1987,35(10):2511
[9]Stobrawa J,Ciura L,Rdzawski Z.Scripta Materialia[J],1996,34(11):1759
[10]Zhang D L,Mihara K,Takaura E et al.Materials Science and Engineering A[J],1999,266(1-2):99
[11]Fujii T,Nakazawa H,Kato M et al.Acta Materialia[J],2000,48(5):1033
[12]Knights R W,Wilkes P.Metallurgical Transactions[J],1973,4(10):2839
[13]Jin Y,Adachi K,Takeuchi T et al.Applied Physics Letters[J],1996,69(10):1391
[14]Jin Y,Adachi K,Takeuchi T et al.Materials Letters[J],1997,32(5-6):307
[15]Jin Y,Adachi K,Takeuchi T et al.Materials Science and Engineering A[J],1996,212(1):149
[16]Zhilyaev A P,Morozova A,Cabrera J M et al.Journal of Marterials Science[J],2017,52(1):305
[17]Mu Siguo(慕思国).Thesis for Doctorate(博士论文)[D].Changsha:Central South University,2008
[18]Wu Di(吴迪).Thesis for Master(硕士论文)[D].Dalian:Dalian University of Technology,2011
[19]Liu Qiang(刘强),Cui Jianzhong(崔建忠),Xu Guangming(许光明)et al.Journal of Northeastern University(东北大学学报)[J],2004,25(9):844
[20]Zhang Zhigang(张志刚).Thesis for Master(硕士论文)[D].Zhengzhou:Zhengzhou University,2013
[21]Zhang Yongsheng(张咏生).Special Casting&Nonferrous Alloy(特种铸造及有色合金)[J],1999(4):55
[22]Xu Gaolei(徐高磊),Yao Youfu(姚幼甫),Luo Yuefeng(骆越峰).Special Casting&Nonferrous Alloy(特种铸造及有色合金)[J],2011,31(7):648
[23]Yuan Yuan,Li Zhou,Xiao Zhu et al.Journal of Alloys and Compounds[J],2017,703:454
[24]Sun Jian(孙健),Liu Ping(刘平),Liu Xinkuan(刘新宽)et al.The Chinese Journal of Nonferrous Metals(中国有色金属学报)[J],2014,24(4):944
[25]Sun Honglin(苏宏林),Li Mingliang(李明亮),Liu Ping(刘平)et al.Forging&Stamping Technology(锻压技术)[J],2015,40(5):80
[26]He Hongwei(何洪威).Thesis for Master(硕士论文)[D].Dalian:Dalian Jiaotong Universit,2013
[27]Zhu C C,Ma A B,Jiang J H et al.Journal of Alloys and Compounds[J],2014,582:135
[28]Duan Y L,Xu G F,Tang L et al.Materials Science and Engineering A[J],2015,648:252
[29]Abib K,Balanos J A M,Alili B et al.Materials Characterization[J],2016,112:252
[30]Peng L J,Xie H F,Huang G J et al.Journal of Alloys and Compounds[J],2017,708:1096
[31]Yu Fangxin(余方新),Cheng Jianyi(程建奕),Shen Bin(沈斌).The Chinese Journal of Nonferrous Metals(中国有色金属学报)[J],2013,23(12):3360
[32]Cheng J Y,Shen B,Yu F X.Materials Characterization[J],2013,81:68
[33]Xia C D,Zhang W,Kang Z Y et al.Materials Science and Engineering A[J],2012,538:295
[34]Yu Yongning(余永宁).Fundamentals of Material Science(材料科学基础)[M].Beijing:Higher Education Press,2006:331
[35]Aguilar C,Martinez V P,Palacios J M et al.Scripta Materialia[J],2007,57(3):213
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