5083铝合金中θ-Al_(45)(Mn,Cr)_7相的孪晶现象
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摘要
应用高分辨透射电镜观察了5083铝合金轧制退火组织中弥散相的形态和微观结构。结果表明:呈球状或不规则形状、尺寸约200～300 nm的弥散相为θ-Al_(45)(Mn,Cr)_7相,属单斜结构,晶胞大小a=2.5196 nm,b=0.7574nm,c=1.0949 nm,β=128.72°。另外,还发现该相颗粒内部易产生孪晶、孪晶畴和复合孪晶,伴有二次孪晶(或微孪晶)和反相畴界等晶体缺陷,孪晶面分别为(111)或(111),共轭面为(110)或(110)。同时从晶体学角度解释了该相孪晶和复合孪晶等缺陷的生成机制。
The morphology and microstructure of dispersoids in 5083 alloy with H116 temper condition were investigated using JEOL 2100 F transmission electron microscope equipped with EDS and STEM. The results show that the discrete spherical-like or irregular-shaped θ-Al_(45)(Mn,Cr)_7 phase which has monoclinic structure with a unit cell of a=2.5196 nm, b=0.7574 nm, c=1.0949 nm, β=128.72° is observed in 5083 alloy. One type of twin is shown to be a)111( or)111( twin with the)111( or)111( plane serving as the twinning plane, and another type of orientation twin is seen to be a)101( domain with the)101( plane serving as the coherent plane. The boundaries of both)101( domain and)111( twin are found to be coincident with the twinning plane. In addition composite-twins are also observed in θ-Al_(45)(Mn,Cr)_7 particles. Possible formation mechanisms of the twins are discussed based on a crystallographic consideration.
The morphology and microstructure of dispersoids in 5083 alloy with H116 temper condition were investigated using JEOL 2100 F transmission electron microscope equipped with EDS and STEM. The results show that the discrete spherical-like or irregular-shaped θ-Al_(45)(Mn,Cr)_7 phase which has monoclinic structure with a unit cell of a=2.5196 nm, b=0.7574 nm, c=1.0949 nm, β=128.72° is observed in 5083 alloy. One type of twin is shown to be a)111( or)111( twin with the)111( or)111( plane serving as the twinning plane, and another type of orientation twin is seen to be a)101( domain with the)101( plane serving as the coherent plane. The boundaries of both)101( domain and)111( twin are found to be coincident with the twinning plane. In addition composite-twins are also observed in θ-Al_(45)(Mn,Cr)_7 particles. Possible formation mechanisms of the twins are discussed based on a crystallographic consideration.
引文
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[24]CHEN Z W,CHEN P,LI S S.Effect of Ce addition on microstructure of Al20Cu2Mn3 twin phase in an Al-Cu-Mn casting alloy[J].Mater Sci Eng A,2012,532:606-609.
[25]PORTER D A,EASTERLING K E.Phase transformations in metals and alloys[M].London:Van Nostrand Reinhold International,1981:283.
[26]KELLY P M,REN H P,QIU D,ZHANG M X.Identifying close-packed planes in complex crystal structures[J].Acta Mater,2010,58:3091-3095.
[27]JIN Y,CHATURVEDI M C.Crystallographic study of Ni2Ge phase in binary Ni-Ge alloy system[J].Acta Mater,1996,44:3833-3845.
[28]AI Y L,LUO C P,LIU J W.Twinning of CaMgSi phase in a cast Mg-1.0Ca-0.5Si-0.3Zr alloy[J].Acta Mater,2007,55:531-538.
[2]BФRVIK T,FORRESTAL M J,HOPPERSTAD O S,WARREN T L,LANGSETH M.Perforation of AA5083-H116 aluminium plates with conical-nose steel projectiles-calculations[J].Int J Impact Eng,2009,36:426-437.
[3]PEREZ-BERGQUIST S J,GRAY III G T,CERRETA E K,TRUJILLO C P,PEREZ-BERGQUIST A.The dynamic and quasi-static mechanical response of three aluminum armor alloys:5059,5083 and 7039[J].Mater Sci Eng A,2011,528:8733-8741.
[4]BUGIO T M A,MARTIS R F,LEAL D N L.Failure analysis of fuel tanks of a lightweight ship[J].Eng Fail Anal,2013,35:272-285.
[5]MCQUEEN H J.Hot working and forming processes[J].JMet,1980,32(2):17-25.
[6]SHEPPARD T,TUTCHER M G.Development of duplex deformation substructure during extrusion of a commercial Al-5Mg-0.8Mn alloy[J].Met Sci,1980,14:579-589.
[7]HUMPHREYS F J.The nucleation of recrystallization at second phase particles in deformed aluminium[J].Acta Metall,1977,25:1323-1344.
[8]LEE S L,WU S T.Identification of second phase in Al-Mg alloys containing Mn[J].Metall Trans,1987,18A:1353-1357.
[9]KONG B O,SUK J I,NAM S W.Identification of Mn-dispersoid in Al-Zn-Mg-Mn alloy[J].J Mater Sci Let,1996,15:763-766.
[10]RADETIC T,POPOVIC M,ROMHANJI E.Microstructure evolution of a modified AA5083 aluminum alloy during a multistage homogenization treatment[J].Mater Char,2012,65:16-27.
[11]GOSWAMI R,SPANOS G,PAO P S,HOLTZ R L.Precipitation behavior of theβphase in Al-5083[J].Mater Sci Eng A,2010,527:1089-1095.
[12]ENGLER O,MILLER-JUPP S.Control of second-phase particles in the Al-Mg-Mn alloy AA 5083[J].J Alloys Compd,2016,689:998-1010.
[13]LI Y J,ZHANG W Z,MARTHINSEN K.Precipitation crystrallography of plate-shaped Al6(Mn,Fe)second phase in AA5182 alloy[J].Acta Mater,2012,60:5963-5974.
[14]AUDIER M,DURAND-CHARRE M,LACLAU E,KLEINH.Phase equilibria in the Al-Cr system[J].J Alloys Compd,1995,220(1):225-230.
[15]GRUSHKO B,PRZEPIóRZY?SKI B,PAVLYUCHKOVD.On the constitution of the high-Al region of the Al-Cr alloy system[J].J Alloys Compd,2008,454(1):214-220.
[16]GRUSHKO B,KOWALSKI W,PAVLYUCHKOV D,BALANETSKYY S,SUROWIEC M.On the constitution of the Al-rich part of the Al-Cr-Mn system[J].J Alloys Compd,2009,468(1):87-95.
[17]BALANETSKYY S,KOWALSKI W,GRUSHKO B.Liquidus,solidus and reaction scheme of the Al-rich part of the Al-Cr-Mn[J].J Alloys Compd,2009,44(1):147-151.
[18]RAGHAVAN V.Al-Cr-Mn(Aluminum-ChromiumManganese)[J].J Phase Equilib Diffus,2009,30(6):620-623.
[19]SCHENK T,DURAND-CHARRER M,AUDIER M.Liquid-solid equilibria in the Al-rich corner of the Al-Mn-Cr system[J].J Alloys Compd,1998,281(2):249-263.
[20]EDINGTON J W.Practical electron microscopy in materials science[M].London:Van Nostrand Reinhold International,1976:283.
[21]LIU H W,LIU J W.A computer program for plotting stereographic projection and exploring crystallographic orientation relationships[J].J Appl Cryst,2012,45:130-134.
[22]桂奇文,陈江华,伍翠兰,王双宝.Al-Cu-Mg合金中T相的扫描透射电镜研究[J].电子显微学报,2012,31(4):301-307.GUI Qi-wen,CHEN Jiang-han,WU Cui-lan,WANGShuang-bao.A HAADF-STEM study of T-phase in the Al-Cu-Mg alloys[J].J Chin Electr Microsc Soc,2012,31(4):301-307.
[23]李春志,王顺才,金延.Al20Cu2Mn3相中孪晶的高分辨电子显微术研究[J].金属学报,1992,28(1):A1-A5.LI Chun-zhi,WANG Shun-cai,JIN Yan.High resolution study of twin in A120Cu2Mn3 phase[J].Acta Metall Sinica,1992,28(1):A1-A5.
[24]CHEN Z W,CHEN P,LI S S.Effect of Ce addition on microstructure of Al20Cu2Mn3 twin phase in an Al-Cu-Mn casting alloy[J].Mater Sci Eng A,2012,532:606-609.
[25]PORTER D A,EASTERLING K E.Phase transformations in metals and alloys[M].London:Van Nostrand Reinhold International,1981:283.
[26]KELLY P M,REN H P,QIU D,ZHANG M X.Identifying close-packed planes in complex crystal structures[J].Acta Mater,2010,58:3091-3095.
[27]JIN Y,CHATURVEDI M C.Crystallographic study of Ni2Ge phase in binary Ni-Ge alloy system[J].Acta Mater,1996,44:3833-3845.
[28]AI Y L,LUO C P,LIU J W.Twinning of CaMgSi phase in a cast Mg-1.0Ca-0.5Si-0.3Zr alloy[J].Acta Mater,2007,55:531-538.