高压扭转诱导新型Al-Zn-Mg-Cu合金第二相回溶
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摘要
分别在380和400℃下对铸态Al-Zn-Mg-Cu合金进行高压扭转实验,随后对变形试样进行温度为100℃、时间为2～10h的时效实验。采用X射线衍射仪、扫描电镜和维氏硬度分析Al-Zn-Mg-Cu合金在高压扭转变形过程中第二相形貌与含量变化以及时效过程中形变试样硬度的变化。结果表明:在高压扭转变形中,合金中第二相破碎、细化并回溶到基体中形成过饱和固溶体,第二相的回溶程度随着温度的升高和变形量的增加而增加。变形试样经100℃时效处理后,硬度随时效时间的增加先上升后下降。试样回溶程度越高,时效达到峰值所需的时间越短。
As-cast Al-Zn-Mg-Cu alloy was deformed by high pressure torsion at 380 ℃ and 400 ℃, respectively, and then proceeded aging treatment at 100 ℃ for 2-10 h. The changes of morphology and content of the secondary phase of Al-Zn-Mg-Cu alloy during high pressure torsion as well as the hardness of the samples deformed by high pressure torsion under aging were studied by X-ray polycrystalline diffraction, scanning electron microscopy and Vickers hardness. The results show that the secondary phase is broken and dissolved into matrix, and then form the supersaturated solid solution,the dissolution degree of the secondary phase increases with increase of the temperature and deformation. The hardness of the samples deformed by high pressure torsion increases and then decreases with the increase of the aging time during aging at 100 ℃. The higher the dissolution degree, the shorter the time reaching the peak of the samples during aging.
As-cast Al-Zn-Mg-Cu alloy was deformed by high pressure torsion at 380 ℃ and 400 ℃, respectively, and then proceeded aging treatment at 100 ℃ for 2-10 h. The changes of morphology and content of the secondary phase of Al-Zn-Mg-Cu alloy during high pressure torsion as well as the hardness of the samples deformed by high pressure torsion under aging were studied by X-ray polycrystalline diffraction, scanning electron microscopy and Vickers hardness. The results show that the secondary phase is broken and dissolved into matrix, and then form the supersaturated solid solution,the dissolution degree of the secondary phase increases with increase of the temperature and deformation. The hardness of the samples deformed by high pressure torsion increases and then decreases with the increase of the aging time during aging at 100 ℃. The higher the dissolution degree, the shorter the time reaching the peak of the samples during aging.
引文
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[22]赵凤晓,许晓嫦,张奇,徐浩浩,刘海全,曾慧颖.固溶原子及析出相对强变形Al-4Cu合金晶粒细化效果的影响[J].中国有色金属学报,2014,24(2):395-402.ZHAO Feng-xiao,XU Xiao-chang,ZHANG Qi,XU Hao-hao,LIU Hai-quan,ZENG Hui-ying.Effect of solute atom and precipitated phase on grain refinement of Al-4Cu alloy by severe plastic deformation[J].The Chinese Journal of Nonferrous Metals,2014,24(2):395-402.
[2]刘斌,汪明朴,雷前,段雨露,刘林贤,虞洪春.喷射沉积法制备Al-Zn-Mg-Cu-Zr合金的显微组织与性能[J].中国有色金属学报,2015,25(7):1773-1780.LIU Bin,WANG Ming-pu,LEI Qian,DUAN Yu-lu,LIULin-xian,YU Hong-chun.Microstructure and properties of Al-Zn-Mg-Cu-Zr alloy prepared by spray deposition method[J].The Chinese Journal of Nonferrous Metals,2015,25(7):1773-1780.
[3]薛杰,王有为,张志豪,谢建新.挤压温度对Al-Zn-Mg-Cu合金动态再结晶、时效组织和力学性能的影响[J].中国有色金属学报,2017,27(11):2204-2211.XUE Jie,WANG You-wei,ZHANG Zhi-hao,XIE Jian-xin.Effects of extrusion temperature on dynamic recrystallization,aging microstructure and mechanical properties of Al-Zn-Mg-Cu alloy[J].The Chinese Journal of Nonferrous Metals,2017,27(11):2204-2211.
[4]孙大智,薛克敏,王成国,李萍.Si C颗粒粒径对高压扭转SiCp/Al复合材料致密度和拉伸性能的影响[J].稀有金属与硬质合金,2016,42(2):64-67.SUN Da-zhi,XUE Ke-min,WANG Cheng-guo,LI Ping.Effects of SiC particles size on density and tensile properties of high-pressure torsion SiCp/Al composites[J].Rare Metals and Cemented Carbides,2016,42(2):64-67.
[5]PATIL D C,DAS M,DAS G,KORIS A,VENKATESWARLU K.Evaluating the mechanical properties of HPT processed aluminium alloys using automated ball-indentation technique[J].Procedia Materials Science,2014,5:379-386.
[6]DESCHAMPS A,GEUSER F D,HOEITA Z,LEE S,RENOU G.Precipitation kinetics in a severely plastically deformed 7075aluminium alloy[J].Acta Materialia,2014,66:105-117.
[7]PATIL D C,KORIS A,VENKATESWARLU K,DAS G,ALHAJERI S N,LANGDON T G.Using ball indentation to determine the mechanical properties of an Al-7475 alloy processed by high-pressure torsion[J].Journal of Materials Science,2013,48:4773-4779.
[8]CHO T S,LEE H J,AHN B,KAWASAKI M,LANGDON T G.Microstructural evolution and mechanical properties in a Zn-Al eutectoid alloy processed by high-pressure torsion[J].Acta Materialia,2014,72:67-79.
[9]HORITA Z,LANGDON T G.Achieving exceptional super plasticity in a bulk aluminum alloy processed by high-pressure torsion[J].Scripta Materialia,2008,58(11):1029-1032.
[10]DOBAKIN S V.On the increase o f thermal stability of ultra fine grained material obtained by severe plastic deformation[J].Materials Science Forum,2003,426/432:2699-2704.
[11]MURAYAMA M,HORITA Z,HONO K.Microstructure of two-phase Al-1.7at%Cu alloy deformed by equal-channel angular pressing[J].Acta Materialia,2001,49:21-29.
[12]OH-ISHI K,HASHI Y,SADAKATA A,KANEKO K,HORITAZ,LANGDON T G.Microstructural control of an Al-Mg-Si alloy using equal-channel angular pressing[J].Materials Science Forum,2002:396/402:333-338.
[13]FATAY D,BASTARASH E,NYILAS K,DOBATKIN S,GUBICZA J,UNGAR T.X-ray diffraction study on the microstructure of an Al-Mg-Sc-Zr alloy deformed by high-pressure torsion[J].International Journal of Materials Research,2003,94(7):842-847.(in Germany)
[14]许晓嫦,刘志义,党鹏,于文斌,谭曼玲,吴纯.研究强塑性变形过程中第二相回溶现象的现状及发展趋势[J].金属热处理,2005,30(4):1-5.XU Xiao-chang,LIU Zhi-yi,DANG Peng,YU Wen-bin,TANMan-ling,WU Chun.Current situation and development of the research on re-dissolution of second phases during severe plastic deformation[J].Heat Treatment of Metals,2005,30(4):1-5.
[15]党鹏,许晓嫦,刘志义,于文斌,宁爱林,曾苏民.Al-Cu合金θ′析出相在等径角挤压中的回溶机理[J].金属热处理,2007,32(8):28-31.DANG Peng,XU Xiao-chang,LIU Zhi-yi,YU Wen-bin,NIAi-lin,ZENG Su-ming.Dissolution mechanisms ofθ′precipitates in Al-Cu alloy deformed by equal-channel angular pressing[J].Heat Treatment of Metals,2007,32(8):28-31.
[16]胡赓祥,蔡珣,戎咏华.材料科学基础[M].第3版.上海:上海交通大学出版社,2010:154-156.HU Geng-xiang,CAI Xun,RONG Yong-hua.Fundamentals of materials science[M].3rd ed.Shanghai:Shanghai Jao Tong University Press,2010:154-156.
[17]CAMPBELL C E,BENDERSKY L A,BOETTINGER W J,LVESTER R.Microstructural characterization of Al-7075-T651chips and work pieces produced by high-speed machining[J].Materials Science&Engineering A,2006,430:15-26.
[18]PEREIRA P H R,FIGUEIREDO R B,HUANG Y,CETLIN P R,LANGDON T G.Modeling the temperature rise in high-pressure torsion[J].Materials Science&Engineering A,2014,593:185-188.
[19]许晓嫦.强变形诱导铝合金析出相低温回溶现象及应用基础研究[D].长沙:中南大学,2008.XU Xiao-chang.Basic investigation on the phenomenon of severe plastic deformation induced re-dissolution of precipitated phase[D].Changsha:Central South University,2008.
[20]YAMAGUCHI D,HORITA Z,NEMOTO M,LANGDON T G.Significance of adiabatic heating in equal-channel angular pressing[J].Scripta Materialia,1999,41(8):791-796.
[21]GRIDNEV V N,GAVIRILYMK V G.Macromechanics and structure formation by equal channel angular pressing[J].Metal-Physics,1982,14(3):135-139.(in Russia)
[22]赵凤晓,许晓嫦,张奇,徐浩浩,刘海全,曾慧颖.固溶原子及析出相对强变形Al-4Cu合金晶粒细化效果的影响[J].中国有色金属学报,2014,24(2):395-402.ZHAO Feng-xiao,XU Xiao-chang,ZHANG Qi,XU Hao-hao,LIU Hai-quan,ZENG Hui-ying.Effect of solute atom and precipitated phase on grain refinement of Al-4Cu alloy by severe plastic deformation[J].The Chinese Journal of Nonferrous Metals,2014,24(2):395-402.