戴晓元,罗要菊,寇莉莉,石志豪

• 1:北京科技大学新金属材料国家重点实验室
• 2:长沙理工大学汽车与机械工程学院
• 3:长沙理工大学物理与电子科学学院

摘要(Abstract)：

采用金相显微镜、扫描电镜、透射电镜和能谱分析,研究了Al-9.0Zn-2.5Mg-2.5Cu-0.15Zr-0.2Sc合金中Al3(Sc,Zr)粒子的形貌及其细化合金铸态组织、提高合金性能的机理。从熔体中析出的一次Al3(Sc,Zr)粒子是α(Al)固溶体的有效形核剂,该粒子以亚稳的L12型Al3Zr为核心,形成富钪与富锆Al3(Sc,Zr)层相间排列的多层复合结构;铸态合金退火后,α(Al)基体内析出二次Al3(Sc,Zr)粒子,经450℃×3 2h退火,二次Al3(Sc,Zr)粒子尺寸为16～23 nm,与α(Al)基体完全共格,该粒子钉扎位错和亚晶界,阻碍合金再结晶过程,提高合金再结晶温度;合金经RRA处理后,抗拉强度、伸长率和电导率分别为:667.5 MPa、7.5%和37.8%IACS,具有良好的综合性能。

关键词(KeyWords)： Al3(Sc,Zr)粒子;晶粒细化;析出;Al-Zn-Mg-Cu-Zr合金

Abstract:

Keywords:

基金项目(Foundation): 新金属材料国家重点实验室开放基金资助项目(2010Z-03)

作者(Author): 戴晓元,罗要菊,寇莉莉,石志豪

DOI: 10.13289/j.issn.1009-6264.2012.s1.014

参考文献(References)：

• [1]Emmanuel Clouet,Ludovic Lae,Thierry Epiaier,et al.Complex precipitation pathways in multicomponent alloys[J].Nature Materials 2006(5):482-487.
• [2]戴晓元,夏长清,马科,等.Sc对Al-Zn-Mg-Cu-Zr合金铸态组织和力学性能的影响[J].中国有色金属学报,2007,17(8):1324-1329.DAI Xiao-yuan,XIA Chang-qing,MA Ke,et al.Effect of Sc on as-cast microstructures and mechanical properties of Al-Zn-Mg-Cu-Zr alloys[J].TheChinese Journal of Nonferrous Metals,2007,17(8):1324-1329.
• [3]Senkoy O N,Miracle D B,Milman Y V,et al.Low temperature mechanical properties of scandium-modified Al-Zn-Mg-Cu alloys[J].Materials ScienceForum,2002,396-402:664-670.
• [4]WU Ling-Mei,WANG Wen-Hsiung,HSU Yung-Fu,et al.Effects of homogenization treatment on recrystallization behavior and dispersoid distributionin an Al-Zn-Mg-Sc-Zr alloy[J].Journal of Alloys and Compounds,2008,456:163-169.
• [5]Morman A F,Hyde K,Costello F,et al.Examination of the effect of Sc on 2000 and 7000 series aluminum alloy castings:for improvements in fusionwelding[J].Materials Science and Engineering A,2003,354:188-198.
• [6]肖代红,陈送义,陈康华.淬火工艺对含Sc的AA7150锻造铝合金性能的影响[J].中国有色金属学报,2010,20(2):226-232.XIAO Dai-hong,CHEN Song-yi,CHEN Kang-hua.Effect of quenching technique on properties of forged aluminum alloy AA7150 with minor Sc[J].The Chinese Journal of Nonferrous Metals,2010,20(2):226-232.
• [7]YIN Zhi-min,JIANG Feng,PAN Qing-lin,et al.Microstructures and mechanical properties of Al-Mg and Al-Zn-Mg based alloys containing minorscandium and zirconium[J].Transactions of Nonferrous Metals Society of China,2003,13(3):515-520.
• [8]Hori S,Unigame Y,Furushiro N,et al.Phase decomposition in splat quenched Al-6%Hf alloy[J].Journal of the Japan Institute of Metals,1982,32:408-412.
• [9]Rokhlin L L,Fridman A S,Dobatkina T V,et al.Determination of grain boundaries of monophase liquid solution in the Al-Mg-Sc-Zr system[J].Izvestiya Akademii Nauk SSSR:Metally,1991(6):158-160.
• [10]Rokhlin L L,Dobatkina T V,Bochvar N R,et al.Investigation of phase equilibria in alloys of the Al-Zn-Mg-Cu-Zr-Sc system[J].Journal of Alloys andCompounds,2004,367:10-16.
• [11]Royset J,Ryum N.Scandium in aluminium alloys[J].International Materials Reviews,2005,50(1):19-44.
• [12]曹明盛,物理冶金基础[M].北京,冶金工业出版社,1985,52-111.
• [13]Norman A F,Prangnell P B,Mcewen R S.The solidification behavior of dilute aluminium-scandium alloys[J].Acta Materialia,1998,46,(16):5715-5732.
• [14]Zhiguo Chen,Simon P.Ringer,Ziqiao Zheng,et al.Microstructural evolution in Al-Sc and Al-Sc-Zr alloys[J].Materials Science Forum,2007,546-549:629-632.
• [15]Naga Raju P,Srinivasa Rao K,Reddy G M,et al.Microstructure and high temperature stability of age hardenable AA2219 aluminium alloy modified bySc,Mg and Zr additions[J].Materials Science and Engineering:A,2007,464:192-201.
• [16]Forbord B,Auran L,Lefebvre W,et al.Rapid precipitation of dispersoids during extrusion of an Al-0.91 wt.%Mn-0.13 wt.%Zr-0.17 wt.%Sc-alloy[J].Materials Science and Engineering:A,2006,424:174-180.
• [17]Davydov V G,Rostova T D,Zakharov V V,et al.Scientific principles of making an alloying addition of scandium to aluminium alloys[J].MaterialsScience and Engineering A,2000,280:30-36.
• [18]Yasuhiro Miura,Chung-Hyung Joh,et al.Determination of vancancy-Sc interaction energy by electrical resistivity measurements[J].Materials ScienceForum,2000,331-337:1031-1036.
• [19]Tolley A,Radmilovic V,Dahmen U.Segregation in Al3(Sc,Zr)precipitates in Al-Sc-Zr alloys[J].Scripta Materialia,2005,52:621-625.
• [20]Christian B Fuller,Joannel L Murray,David N Seidman.Temporal evolution of the nanostructure of Al(Sc,Zr)alloy:PartⅠ-Chemical compositions ofAl3(Sc1-x Zr x)precipitates[J].Acta Materialia,2005,53:5401-5413.
• [21]Milman Y V,Sirko A I,Lotsko D V,Senkov O N,Miracle D B.Microstructure and mechanical properties of cast and wrought Al-Zn-Mg-Cu alloysmodified with Zr and Sc[J].Mater Science Forum,2002:396-402,1127-1132.
• [22]王祝堂,张燕,江斌.钪-铝合金的新型微合金元素[J].轻合金加工技术,2000,8(1):23-31.WANG Zhu-tang,ZHANG Ye,JIANG Bing.Scandium-a new trace alloying element for aluminium alloy[J].Light Alloy Fabrication Technology,2000,8(1):23-31.
• [23]戴晓元,喻井萍,寇莉莉.Sc微合金化对Al-Zn-Mg-Cu-Zr合金组织性能的影响[J].材料热处理学报,2010,31(6):89-94.DAI Xiao-yuan,YU Jing-Ping,KOU Li-li.Effect of microalloying of Sc on microstructure and properties of Al-Zn-Mg-Cu-Zr alloys[J].Transactions ofMaterials and Heat Treatment,2010,31(6):89-94.

文章评论(Comment)：