杨开怀,彭开萍,陈文哲

• 1:福建交通职业技术学院汽车运用与工程机械系
• 2:福州大学材料科学与工程学院
• 3:福建工程学院

摘要(Abstract)：

在自制的新型组合式模具上对商业5052铝合金板材进行两种不同结构模具下的反复模压变形,并用光学显微镜和透射电镜对变形合金进行显微组织分析。结果表明:限制模压(Constrained Groove Pressing,CGP)变形和非限制模压(UnconstrainedGroove Pressing,UGP)变形均能够有效细化5052铝合金,其平均晶粒尺寸随变形道次的增加而减小。在两种不同结构模具的反复模压变形下,5052铝合金呈现出不同的组织特征。经CGP变形后合金组织基本由破碎的等轴小晶粒构成,形成包含高密度位错的等轴状亚晶;而经UGP变形后,形成类似于冷轧变形金属组织的拉长晶粒和具有较大取向差的包含高密度位错的带状亚结构。与UGP相比,CGP更有利于晶粒细化和形成等轴晶粒。

关键词(KeyWords)： 模压变形;模具结构;5052铝合金;显微组织;变形机制

Abstract:

Keywords:

基金项目(Foundation): 福建省科技厅重点项目(2009H0023);; 福建省教育厅资助项目(JB07027)

作者(Author): 杨开怀,彭开萍,陈文哲

DOI: 10.13289/j.issn.1009-6264.2011.06.020

参考文献(References)：

• [1]Shin D H,Park J J,Kim Y S,et al.Constrained groove pressing and its application to grain refinement of aluminum[J].Materials Science&Engineering A,2002,328:98-103.
• [2]Krishnaiah A,Chakkingal U,Venugopal P.Applicability of the groove pressing technique for grain refinement in commercial purity copper[J].Materials Science&Engineering A,2005,410-411:337-340.
• [3]Krishnaiah A,Chakkingal U,Venugopal P.Production of ultrafine grain sizes in aluminium sheets by severe plastic deformation using the technique ofgroove pressing[J].Scripta Materialia,2005,52:1229-1233.
• [4]杨开怀,陈文哲.大体积超细晶金属材料的剧烈塑性变形法制备技术[J].塑性工程学报,2010,17(2):123-129.YANG Kai-huai,CHEN Wen-zhe.Producing bulk ultrafine-grained materials by severe plastic deformation[J].Journal of Plasticity Engineering,2010,17(2):123-129.
• [5]杨开怀,彭开萍,陈文哲.限制模压变形均匀性研究与定量表征[J].塑性工程学报,2010,17(4):8-12.YANG Kai-huai,PENG Kai-ping,CHEN Wen-zhe.Investigation and quantitative characterization of homogeneity in constrained groove pressing[J].Journal of Plasticity Engineering,2010,17(4):8-12.
• [6]Zrnik J,Kovarik T,Novy Z,et al.Ultrafine-grained structure development and deformation behavior of aluminium processed by constrained groovepressing[J].Materials Science&Engineering A,2009,503:126-129.
• [7]Zrnik J,Kovarik T,Cieslar M.Microstructure and properties of aluminium processed by constrained groove pressing[J].Materials Science Forum,2008,584-586:535-540.
• [8]Peng Kaiping,Su Lifeng,Shaw L L,et al.Grain refinement and crack prevention in constrained groove pressing of two-phase Cu-Zn alloys[J].ScriptaMaterialia,2007,56:987-990.
• [9]Peng Kai-ping,Zhang Ying,Shaw L L,et al.Microstructure dependence of a Cu-38Zn alloy on processing condition of constrained groove pressing[J].Acta Materialia,2009,57:5543-5553.
• [10]汪守朴.金相分析基础[M].北京:机械工业出版社,1986.
• [11]Iwahashi Y,Horita Z,Nemoto M,et al.Factors influencing the equilibrium grain size in equal-channel angular pressing:role of Mg additions toaluminum[J].Metallurgical and Materials Transactions A,1998,29:2503-2510.
• [12]Morris D G,Muňoz-Morris M A.Microstructure of severely deformed Al-3Mg and its evolution during annealing[J].Acta Materialia,2002,50:4047-4060.
• [13]Oh-ishi K,Horita Z,Smith D J,et al.Grain boundary structure in Al-Mg and Al-Mg-Sc alloys after equal-channel angular pressing[J].Journal ofMaterials Research,2001,16:583-589.
• [14]Horita Z,Smith D J,Furukawa M,et al.An investigation of grain boundaries in submicrometer-grained Al-Mg solid solution alloys using high-resolutionelectron microscopy[J].Journal of Materials Research,1996,11:1880-1890.
• [15]Tsai T L,Sun P L,Kao P W,et al.Microstructure and tensile properties of a commercial 5052 aluminium alloy processed by equal channel angularextrusion[J].Materials Science&Engineering A,2003,342:144-151.
• [16]张新明,邓运来,刘瑛,等.不同温度轧制多晶铝的微观组织与晶界分布[J].金属学报,2005,41(9):947-952.ZHANG Xin-ming,DENG Yun-lai,LIU Ying,et al.Microstructure and boundary distribution in Al polycrystals rolled at different temperatures[J].Acta Metallurgica Sinica,2005,41(9):947-952.
• [17]Zhu Hangliang,Ghosh A K,Maruyama K.Effect of cold rolling on microstructure and material properties of 5052 alloy sheet produced by continuouscasting[J].Materials Science&Engineering A,2006,419:115-121.
• [18]Korbel A,Embury D J,Hatherly M,et al.Microstructural aspects of strain localization in Al-Mg alloys[J].Acta Metallurgica,1986,34:1999-2009.
• [19]Hughes D A.Microstructural evolution in a non-cell forming metal:Al-Mg[J].Acta Metallurgica et Materialia,1993,41:1421-1430.
• [20]Nakayama Y,Morii K.Microstructural and shear band formation in rolled single crystals of Al-Mg alloy[J].Acta Metallurgica,1987,35:1747-1755.
• [21]Verdier M,Janecek M,Brěchet Y,et al.Microstructures evolution during recovery in Al-2.5%Mg alloys[J].Materials Science&Engineering A,1998,248:187-197.

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