侯小虎,白朴存,沈元国,李博

• 1:内蒙古工业大学材料科学与工程学院

摘要(Abstract)：

采用拉伸实验、硬度测试、高分辨透射电子显微镜(HRTEM)﹑扫描电镜(SEM)等方法研究了回归及回归再时效处理对喷射沉积高Zn(质量分数为12%)7000系铝合金的微观组织及力学性能的影响。结果表明,该合金经峰值时效处理(120℃×14 h)后,晶内主要强化相为GPⅡ区,晶界析出相呈连续分布;经回归处理(180℃×0.5 h)后,晶内主要强化相为较小的η'相,晶界析出相明显粗化;采用回归再时效处理(120℃×14 h+180℃×0.5 h+120℃×14 h)后,晶内析出物为亚稳定的η'相和稳定的η相,晶界析出相为不连续分布的η相;对η相高分辨像进行解卷处理,利用jems软件构建η相晶胞并模拟其高分辨像,最终确定η相各原子所在的位置。回归时效实验合金的抗拉强度达到890 MPa,伸长率为9.2%,断口为沿晶和穿晶混合断裂。

关键词(KeyWords)： 7000系铝合金;喷射沉积;回归再时效;微观组织;解卷处理

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(11362014,10962005,10562003);; 内蒙古工业大学科学研究项目(ZS201141)

作者(Author): 侯小虎,白朴存,沈元国,李博

DOI: 10.13289/j.issn.1009-6264.2014.10.007

参考文献(References)：

• [1]Heinz A,Haszler A,Keidel C,et al.Recent development in aluminium alloys for aerospace applications[J].Materials Science and Engineering A,2000,280(1-2):102-107.
• [2]Ferragut R,Somoza A,Tolley A.Microstructural evolution of 7012 alloy during the early stages of artificial aging[J].Acta Materialia,1999,47(17):4355-4364.
• [3]Bai P C,Hou X H,Zhang X Y.Microstructure and mechanical properties of a large billet of spray formed Al-Zn-Mg-Cu alloy with high Zn content[J].Materials Science and Engineering A,2009,508(1-2):23-27.
• [4]Berg L K,Gjonnes J,Hansen V.GP-zones in Al-Zn-Mg alloys and their role in artificial aging[J].Acta Materialia,2001,48(17):3443-3451.
• [5]LI Zhi-hui,XIONG Bai-qing,ZHANG Yon-gan.Investigation of microstructural evolution and mechanical properties during two-step aging treatment at115and 160℃in an Al-Zn-Mg-Cu alloy pre-stretched thick plate[J].Materials Characterization,2008,59(3):278-282.
• [6]Waterloo G,Hansen V,Gjonnes J,et al.Effect of predeformation and preaging at room temperature in Al-Zn-Mg-(Cu,Zr)alloys[J].Materials Science and Engineering A,2001,303(1-2):226-233.
• [7]侯小虎,白朴存,刘飞,等.喷射成形挤压态Al-12Zn-2.4Mg-1.1Cu-0.5%Ni合金显微组织研究[J].稀有金属材料与工程,2012,41(S2):101-104.HOU Xiao-hu,BAI Pu-cun,LIU Fei,et al.Microstructure Analysis of Spray Formed Al-12Zn-2.4Mg-1.1Cu-0.5%NiAlloy after Extrusion[J].Rare Metal Materials and Engineering,2012,41(S2):101-104.
• [8]李文斌,潘清林,肖艳苹,等.时效工艺对Al-Zn-Cu-Mg-Sc-Zr合金组织与性能的影响[J].材料热处理学报,2011,32(8):47-53.LI Wen-bin,PAN Qing-lin,XIAO Yan-ping,et al.Effect of aging processes on microstructure and properties of Al-Zn-Cu-Mg-Sc-Zr alloy[J].Transactions of Materials and Heat Treatment,2011,32(8):47-53.
• [9]曾渝,尹志民,朱远志,等.RRA处理对超高强铝合金微观组织与性能的影响[J].中国有色金属学报,2004,14(7):1188-1194.ZENG Yu,YIN Zhi-min,ZHU Yuan-zhi,et al.Effect of RRA on microstructure and properties of new type ultra high strength aluminum alloy[J].The Chinese Journal of Nonferrous Metals,2004,14(7):1189-1194.
• [10]王洪斌,崔华,郝斌,等.喷射沉积超高强Al-Zn-Mg-Cu合金的回归再时效处理[J].金属学报,2005,41(12):1267-1271.WANG Hong-bin,CUI Hua,HAO Bin,et al.Retrogression reaging treatment of spray deposited Al-Zn-Mg-Cu alloy[J].Metallurgica Sinicaz,2005,41(12):1267-1271.
• [11]李文斌,潘清林,刘俊生,等.含Sc超高强Al-Zn-Mg-Cu-Zr合金的回归再时效处理制度[J].中国有色金属学报,2009,19(9):1533-1538.LI Wen-bin,PAN Qing-lin,LIU Jun-sheng,et al.Optimum retrogression and reaging heat treatment of super-high strength Al-Zn-Mg-Cu-Zr alloy containing Sc[J].The Chinese Journal of Nonferrous Metals,2009,19(9):1533-1538.
• [12]万威,唐春艳,王迪,等.高分辨电子显微像的解卷处理程序:DEC[J].电子显微学报,2005,24(4):374-347.WAN Wei,TANG Chun-yan,WANG Di,et al.Deconvolution processing program of High-resolution electron microscopy:DEC[J].Journal of Chinese Electron Microscopy Society,2005,24(4):374-347.
• [13]杨浩,陈江华,胡特,等.Cu-Cr-Zr合金时效析出相的研究[J].电子显微学报,2010,29(4):317-321.YANG Hao,CHEN Jiang-hua,HU Te,et al.A transmission electron microscopy study of the hardening precipitates in CuCrZr alloys[J].Journal of Chinese Electron Microscopy Society,2010,29(4):317-321.
• [14]Chen J Z,Zhen L,Yang S J,et al.Investigation of precipitation behavior and related hardening in AA7055 aluminum alloy[J].Materials Science and Engineering A,2009,500(1-2):34-42.
• [15]Stiller K,Warren P J,Hansen V,et al.Investigation of precipitation in an Al-Zn-Mg alloy after two-step aging treatment at 100°and 150℃[J].Materials Science and Engineering A,1999,270(1):55-63.

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