Al-Cu-Li合金热变形过程中微观组织的动态演变规律
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摘要
采用等温热变形实验,结合TEM分析,研究了Al-Cu-Li合金热变形过程的动态软化机制和析出相动态演变规律。基于Zener-Hollomon参数(Z)、变形温度(T)、热激活参数和微观组织分析,明确了合金热变形过程的动态软化机制。结果表明:当ln Z>51.70,t<420℃时,以螺位错的交滑移和刃位错攀移为主要软化机制;当47.10460℃时,没有T_1相析出。热变形过程β′(Al_3Zr)相和含Mn相始终稳定存在,δ′(Al_3Li)相在淬火过程即可析出。
The dynamic softening mechanism and the dynamic evolution of the precipitate phase in the thermal deformation process of Al-Cu-Li alloy were studied by isothermal thermal deformation experiment and TEM analysis.Based on the Zener-Hollomon parameter(Z), deformation temperature(t), thermal activation parameters and microstructure analysis, the dynamic softening mechanism of the alloy during the thermal deformation was clarified. The results show that, when ln Z>51.70 and T<420 ℃, the main softening mechanism is cross-slip of screw dislocation and climbing of edge dislocation; when 47.10
The dynamic softening mechanism and the dynamic evolution of the precipitate phase in the thermal deformation process of Al-Cu-Li alloy were studied by isothermal thermal deformation experiment and TEM analysis.Based on the Zener-Hollomon parameter(Z), deformation temperature(t), thermal activation parameters and microstructure analysis, the dynamic softening mechanism of the alloy during the thermal deformation was clarified. The results show that, when ln Z>51.70 and T<420 ℃, the main softening mechanism is cross-slip of screw dislocation and climbing of edge dislocation; when 47.10
引文
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[2]LI B,PAN Q L,YIN Z M.Characterization of hot deformation behavior of as-homogenized Al-Cu-Li-Sc-Zr alloy using processing maps[J].Materials Science and Engineering A,2014,614:199-206.
[3]SHEN B,DENG L,WANG X Y.A new dynamic recrystallisation model of an extruded Al-Cu-Li alloy during high-temperature deformation[J].Materials Science and Engineering A,2015,625:288-295.
[4]TAKAKI T,YOSHIMOTO C,YAMANAKA A,TOMITA Y.Multiscale modeling of hot-working with dynamic recrystallization by coupling microstructure evolution and macroscopic mechanical behavior[J].International Journal of Plasticity,2014,52:105-116
[5]杨胜利,沈健,闫晓东,李锡武,孙宝庆,毛柏平.基于Al-Cu-Li合金流变行为的动态再结晶动力学形核机制[J].中国有色金属学报,2016,26(2):365-374.YANG Sheng-li,SHEN Jian,YAN Xiao-dong,LI Xi-wu,SUN Bao-qing,MAO Bai-ping.Analysis on the dynamic recrystallization kinetics and nucleation mechanism of Al-Cu-Li alloy based on flow behavior[J].The Chinese Journal of Nonferrous Metals,2016,26(2):365-374.
[6]ZHANG F,SUN J L,SHEN J,YAN X D,CHEN J.Flow behavior and processing maps of 2099 alloy[J].Materials Science and Engineering A,2014,613:141-147.
[7]YIN H,LI H.,SU X,SU X J,HUANG D S.Processing maps and microstructural evolution of isothermal compressed Al-Cu-Li alloy[J].Materials Science and Engineering A,2013,586:115-122.
[8]魏修宇,郑子樵,潘峥嵘,陈圆圆,李世晨,陈秋妮.预变形对2197铝锂合金显微组织和力学性能的影响[J].稀有金属材料与工程,2008,37(11):1996-1999.WEI Xiu-yu,ZHENG Zhi-qiao,PAN Zheng-rong,CHENYuan-yuan,LI Shi-chen,CHEN Qiu-ni.Effect of pre-deformation on microstructure and mechanical properties of 2197 Al-Li alloy[J].Rare Metal Materials and Engineering,2008,37(11):1996-1999.
[9]范春平,郑子樵,贾敏,钟继发,程彬,李红萍,吴秋萍.2397铝锂合金显微组织、拉伸性能和断裂韧性研究[J].稀有金属材料与工程,2015,44(1):91-96.FAN Chun-ping,ZHENG Zi-qiao,JIA Min,ZHONG Ji-fa,CHENG Bin,LI Hong-ping.Study on microstructure,tensile properties and fracture toughness of 2397 Al-Li alloy[J].Rare Metal Materials and Engineering,2015,44(1):91-96.
[10]沈健.AA7055铝合金的热加工变形特性[J].中国有色金属学报,2001,11(4):593-597.SHEN Jian.Hot working deformation characteristics of AA7005 aluminum alloy[J].The Chinese Journal of Nonferrous Metals,2001,11(4):593-597.
[11]张飞,沈健,闫晓东,孙建林,蒋呐,周华.2099合金热变形过程中的动态软化机制[J].金属学报,2014,50(6):691-699.ZHANG Fei,SHEN Jian,YAN Xiao-dong.Dynamic softening mechanism of 2099 alloy during hot deformation[J].Acta Metallurgica Sinica,2014,50(6):691-699.
[12]RAO K P,PRASAD Y V R K.High temperature deformation kinetics of Al-4Mg alloy[J].Journal of Mechanical Working Technology,1986,13(1):83-95.
[13]杨胜利,沈健,闫晓东,李锡武,孙宝庆,张飞.Al-Cu-Li-Mg-Mn-Zn-Ag合金的热变形流变行为与本构方程[J].中国有色金属学报,2015,25(8):2083-2091.YANG Sheng-li,SHEN Jian,YAN Xiao-dong,LI Xi-wu,SUN Bao-qing,ZHANG Fei.Flow behavior and constitutive equations in isothermal compression of Al-Cu-Li-Mg-MnZn-Ag alloy[J].The Chinese Journal of Nonferrous Metals,2015,25(8):2083-2091.
[14]LI J C M.Possibility of subgrain rotation during recrystallization[J].Journal of Applied Physics,1962,33(10):2958-2965.
[15]RAYBOULD D,SHEPPARD T.Axisymmetric extrusionThe effect of temperature rise and strain rate on the activation enthalpy and material constants of some aluminum alloys and their relation to recrystallization,substructure and subsequent mechanical properties[J].J Inst Met,1973,101:65-72.
[16]沈健.2091铝锂合金高温塑性变形行为研究[D].长沙:中南工业大学,1996.SHEN Jian.Study on high temperature plastic deformation behavior of 2091 Al-Li alloy[D].Changsha:Central South University of Technology,1996.
[17]宋维锡.金属学[M].北京:冶金工业出版社,2007:147-149,187-200.SONG Wei-xi.Metallography[M].Beijing:Metallurgical Industry Press,2007:147-149,187-200.
[18]SHA G,WANG Y B,LIAO X Z,DUAN Z C,RINGER S P,LANGDON T G.Influence of equal-channel angular pressing on precipitation in an Al-Zn-Mg-Cu alloy[J].Acta Materialia,2009,57(10):3123-3132.
[19]GARCíA-INFANTA J M,SWAMINATHAN S,CEPEDA-JIMéNEZ C M,MCNELLEY T R,RUANO O A,CARRENO F.Enhanced grain refinement due to deformation-induced precipitation during ambient-temperature severe plastic deformation of an Al-7%Si alloy[J].Journal of Alloys and Compounds,2009,478:139-143.
[20]TSIVOULAS D,ROBSON J D,SIGLI C,PRANGNELL PB.Interactions between zirconium and manganese dispersoid-forming elements on their combined addition in Al-Cu-Li alloy[J].Acta Materialia,2012,60:5245-5259.
[21]TSIVOULAS D,PRANGNELL P B,SIGLI C,BéS B.Effects of combined Zr and Mn additions on dispersoid formation and recrystallisation behaviour of AA2198 sheet[J].Advanced Materials Research,2010,89:568-573.
[22]JIA Z,COUZINIE J P,CHERDOUDI N,GUILLOT I,ARNBERG L,?SHOLT P,BRUSETHAUG S,BARLAS E,MASSINON D.Precipitation behaviour of Al3Zr precipitate in Al-Cu-Zr and Al-Cu-Zr-Ti-V alloys[J].Transactions of Nonferrous Metals Society of China,2012,22(8):1860-1865.
[23]GREGSON P J,FLOWER H M.δ′precipitation in Al-Li-Mg-Cu-Zr alloys[J].Journal of Materials Science Letters,1984,3(9):829-834.
[24]BAUMANN S F,WILLIAMS D B.A new method for the determination of the precipitate-matrix interfacial energy[J].Scripta Metallurgica,1984,18(6):611-615.
[25]LIN H Y,TANG Y,ZENG Z D,ZHENG Z Q,ZHENG F.Effect of ageing time on strength and microstructures of an Al-Cu-Li-Zn-Mg-Mn-Zr alloy[J].Materials Science and Engineering A,2008,498:314-320.