均匀化处理对航空用Al-8.5Zn-2.3Cu-2.2Mg合金相组织的影响
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摘要
通过扫描电镜和透射电镜观察,研究了单级和双级均匀化工艺对铸态Al-8.5Zn-2.3Cu-2.2Mg(mass%)合金相组织的影响。结果表明:经465℃×(12~36 h)单级均匀化处理,残留相仍然较多;经430℃×12 h+470℃×24 h、465℃×24 h+475℃×12 h双级均匀化处理,残留相的数量显著减少,465℃×24 h+475℃×12 h处理残留相更少;465℃×24 h单级均匀化处理残留相主要为Al_2CuMg,少量Al7Cu2Fe,经430℃×12 h+470℃×24 h、465℃×24 h+475℃×12 h处理除还有少量Al(ZnMgCu)相没溶外,没有发现Al_2CuMg;此外,430℃×12 h+470℃×24 h双级均匀化处理相比于465℃×24 h单级处理,有利于析出弥散、均匀的Al_3Zr粒子。
The influence of homogenization treatment on phase structure of Al-8. 5 Zn-2. 3 Cu-2. 2 Mg aluminum alloy was studied by means of scanning electron microscopy and transmission electron microscopy. The results show that a large amount of retained phases are observed in the alloy after single-stage homogenization treatment at 465 ℃ for 12-36 h. The amount of the retained phases decreases significantly after double-stage homogenization treatment( 430 ℃ × 12 h + 470 ℃ × 24 h or 465 ℃ × 24 h + 475 ℃ × 12 h),and the amount of the retained phases is least after double-stage homogenization treatment at 465 ℃ for 24 h and then at 475 ℃ for 12 h. The retained phases are mainly Al_2CuMg and little A_7Cu_2Fe after single-stage treatment at 465 ℃ for 24 h,after double-stage homogenization treatment,the Al_2CuMg phase disappears,only little Al( Zn Mg Cu) phase is observed. In addition,compare with the single-stage homogenization treatment,the double-stage homogenization treatment is beneficial to precipitate dispersed and uniform Al_3Zr particles.
The influence of homogenization treatment on phase structure of Al-8. 5 Zn-2. 3 Cu-2. 2 Mg aluminum alloy was studied by means of scanning electron microscopy and transmission electron microscopy. The results show that a large amount of retained phases are observed in the alloy after single-stage homogenization treatment at 465 ℃ for 12-36 h. The amount of the retained phases decreases significantly after double-stage homogenization treatment( 430 ℃ × 12 h + 470 ℃ × 24 h or 465 ℃ × 24 h + 475 ℃ × 12 h),and the amount of the retained phases is least after double-stage homogenization treatment at 465 ℃ for 24 h and then at 475 ℃ for 12 h. The retained phases are mainly Al_2CuMg and little A_7Cu_2Fe after single-stage treatment at 465 ℃ for 24 h,after double-stage homogenization treatment,the Al_2CuMg phase disappears,only little Al( Zn Mg Cu) phase is observed. In addition,compare with the single-stage homogenization treatment,the double-stage homogenization treatment is beneficial to precipitate dispersed and uniform Al_3Zr particles.
引文
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[21]万里.Al-Zn-Mg-Cu系铝合金的均匀化热处理工艺[D].长沙:中南大学,2011.WAN Li.Homogenization heat treatment process of Al-Zn-Mg-Cu alloys[D].Changsha:Central South University,2011.
[2]张新明,陆艳红,刘胜胆,等.分级均匀化对7055铝合金组织和力学性能的影响[J].中国有色金属学报,2012,22(8):2154-2162.ZHANG Xin-ming,LU Yan-hong,LIU Sheng-dan,et al.Effect of step-homogenization on microstructures and mechanical properties of 7055 aluminum alloy[J].The Chinese Journal of Nonferrous Metals,2012,22(8):2154-2162.
[3]Heinz A,Haszler A,Keidel C,et al.Recent development in aluminum alloys for aerospace applications[J].Materials Science and Engineering,2000,280:102-107.
[4]Fan X G,Jiang D M,Meng Q C,et al.Evolution of intermetallic phases of Al-Zn-Mg-Cu alloy during heat treatment[J].Transactions of Nonferrous Metals Society of China,2006,16:1248-1250.
[5]袁新雄,尹登峰,余鑫祥,等.Al-Zn-Mg-Cu-Zr-0.12Ce合金铸锭的均匀化退火及组织演变[J].中国有色金属学报,2017,27(3):459-467.YUAN Xin-xiong,YIN Deng-feng,YU Xin-xiang,et al.Homogenization treatment of as-cast Al-Zn-Mg-Cu-Zr-0.12Ce aluminum alloy and microstructure evolution during homogenization[J].The Chinese Journal of Nonferrous Metals,2017,27(3):459-467.
[6]戴晓元,罗要菊,寇莉莉,等.Al-9.0Zn-2.5Mg-2.5Cu-0.15Zr-0.2Sc合金中Al3(Sc,Zr)粒子的析出行为[J]材料热处理学报,2012,33(S1):61-66.DAI Xiao-yuan,LUO Yao-ju,KOU Li-li,et al.Precipitation behavior of Al3(Sc,Zr)particle Al-9.0Zn-2.5Mg-2.5Cu-0.15Zr-0.2Sc alloy[J].Transactions of Materials and Heat Treatment,2012,33(S1):61-66.
[7]Guo S,Ning Z L,Zhang M X,et al.Effects of gas to melt ratio on the microstructure of an Al-10.83Zn-3.39Mg-1.22Cu alloy produced by spray atomization and deposition[J].Materials Characterization,2014,87(1):62-69.
[8]Chandan Mondal,Mukhopadhyay A K.On the nature of T(Al2Mg3Zn3)and S(Al2Cu Mg)phases present in as-cast and annealed7055 aluminum alloy[J].Materials Science and Engineering A,2005,391:367-376.
[9]Fan X G,Jang D M,Meng Q C,et al.The microstructural evolution of an Al-Zn-Mg-Cu alloy during homogenization[J].Materials Letters,2006,60(12):1475-1479.
[10]滕海涛,熊柏青,张永安,等.高Zn含量Al-Zn-Mg-Cu系铝合金的凝固态显微组织[J].中国有色金属学报,2015,25(4):852-863.TENG Hai-tao,XIONG Bai-qing,ZHANG Yong-an,et al.Solidification microstructure of high zinc-containing Al-Zn-Mg-Cu alloys[J].The Chinese Journal of Nonferrous Metals,2015,25(4):852-863.
[11]钟皓,韩逸,邓桢桢,等.7150铝合金铸态及均匀化退火组织研究[J].金属热处理,2008,33(4):36-38.ZHONG Hao,HAN Yi,DENG Zhen-zhen,et al.Study on the microstructure of as-cast and homogenized 7150 aluminum alloy[J].Heat Treatment of Metals,2008,33(4):36-38.
[12]曾渝.超高强Al-Zn-Mg-Cu-Zr合金组织与性能研究[D].长沙:中南大学,2004.ZENG Yu.Study on the microstructure and property of ultra-high strength Al-Zn-Mg-Cu-Zr alloys[D].Changsha:Central South University,2004.
[13]Morris A J,Robey R F,Couch P D,et al.A comparison of the damage tolerance of 7010 T 7451 and 7050 T7451[J].Materials Science Forum,1997,242:181-186
[14]陈琴,潘清林,王迎,等.微量Sc和Zr对Al-Mg-Mn合金组织与力学性能的影响[J].中国有色金属学报,2012,22(6):1555-1563.CHEN Qin,FAN Qing-lin,WANG Ying,et al.Effects of minor scandium and zirconium on microstructure and mechanical properties of Al-Mg-Mn alloys[J].The Chinese Journal of Nonferrous Metals,2012,22(6):1555-1563.
[15]Eivani A R,Ahmed H,Zhou J,et al.Evolution of grain boundary phases during the homogenization of AA7020 aluminum alloy[J].Metallurgical Materials Transactions A,2009,40:71-728.
[16]Li G F,Zhang X M,Zhu H F.Effect of minor Er and Y addition on homogenization of as-cast Al-Zn-Mg-Cu-Zr alloys[J].Journal of Aeronautical Materials,2010,30:1-6.
[17]Liu Y,Jiang D M,Xie W L,et al.Solidification phases and their evolution during homogenization of a DC cast Al-8.35Zn-2.5Mg-2.25Cu alloy[J].Materials Characterization,2014,93:173-183.
[18]Chen K H,Liu H W,Zhang Z,et al.The improvement of constituent dissolution and mechanical properties of 7055 aluminum alloy by stepped head treatments[J].Journal of Materials Processing Technology,2003,142:190-196.
[19]Jia Z H,Hu G Q,Forbord B,et al.Effect of homogenization and alloying elements on recrystallization resistance of Al-Zr-Mn alloys[J].Materials Science and Engineering A,2007,444(1/2):284-290.
[20]Robson J D.Optimizing the homogenization of zirconium containing commercial aluminium alloys using a novel process model[J].Materials Science and Engineering A,2002,338(1/2):219-229.
[21]万里.Al-Zn-Mg-Cu系铝合金的均匀化热处理工艺[D].长沙:中南大学,2011.WAN Li.Homogenization heat treatment process of Al-Zn-Mg-Cu alloys[D].Changsha:Central South University,2011.