张晓伟,田保红,张毅,刘勇,贾淑果,任凤章

• 1:河南科技大学材料科学与工程学院
• 2:河南省有色金属材料科学与加工技术重点实验室

摘要(Abstract)：

采用真空热压烧结法制备了纳米Al2O3弥散强化铜为基体,W颗粒为增强相的W(50)/Cu-Al2O3新型复合材料。在Gleeble-1500D热模拟机上对真空热压烧结W(50)/Cu-Al2 O3复合材料进行等温热压缩实验,研究了在变形温度为650～950℃;变形速率为0.01～5 s-1;最大真应变为0.7条件下的流变应力行为。结果表明:在实验条件下,复合材料W(50)/Cu-Al2O3存在明显的动态再结晶特征,即变形初期,流变应力随着应变量的增大而迅速增大,达到峰值之后流变应力逐渐趋于平稳,不随应变的增加而明显变化。变形温度和变形速率对流变应力影响显著,随着温度的升高和应变速率的减小,峰值应力逐渐减小,并且在晶界交叉处出现再结晶晶粒,并逐渐增多。复合材料的主要软化机制为动态再结晶。建立了复合材料高温变形时的流变应力本构方程,并确定了热变形激活能Q为176.05 kJ/mol。

关键词(KeyWords)： W(50)/Cu-Al2O3复合材料;热压缩变形;动态再结晶;本构方程

Abstract:

Keywords:

基金项目(Foundation): 河南省杰出青年基金项目(6521002700);; 河南省高校创新人才培养工程(豫教高2005-126)

作者(Author): 张晓伟,田保红,张毅,刘勇,贾淑果,任凤章

DOI: 10.13289/j.issn.1009-6264.2011.08.005

参考文献(References)：

• [1]Pintsuk G,Brünings S E,Dòring J E,et al.Development of W/Cu-functionally graded materials[J].Fusion Engineering and Design,2003,(66-68):237-240.
• [2]刘彬彬,鲁岩娜,谢建新.热压烧结制备近全致密W-Cu梯度热沉材料[J].中国有色金属学报,2007,17(9):1410-1416.Liu Bin-bin,Lu Yan-na,Xie Jian-xin.Fabrication of tungsten-copper functionally gradient materials with nearly full density by hot press[J].TheChinese Journal of Nonferrous Metals,2007,17(9):1410-1416.
• [3]Zhou Z J,Kwon Y S.Fabrication of W-Cu composite by resistance sintering under ultra-high pressure[J].Journal of Materials Processing Technology,2005,168(1):107-111.
• [4]薛翔,李松,丘如亮,等.W-Cu复合材料的研究进展[J].材料导报,2008,22(S1):294-298.Xue Xiang,Li Song,Qiu Ru-liang,et al.Research progress in W-Cu matrix composites[J].Materials Review,2008,220(S1):294-298.
• [5]Yutaka Hiraoka,Hideaki Hanado,Takeshi Inoue.Deformation behavior at room temperature of W-80vol%Cu composite[J].International Journal ofRefractory Metals&Hard Materials,2004,22(2-3):87-93.
• [6]范景莲,龚星,祁美贵,等.细晶钨合金的制备与动态失效行为[J].中国有色金属学报,2009,19(12):2143-2148.Fan Jing-lian,Gong Xing,Qi Mei-gui,et al.Fabrication of fine-grain tungsten heavy alloy and its dynamic failure behavior[J].The Chinese Journal ofNonferrous Metals,2009,19(12):2143-2148.
• [7]刘勇,田保红,陈卫,等.内氧化法制备Cr2O3弥散强化铜复合材料[J].材料热处理学报,2008,29(5):22-25.Liu Yong,Tian Bao-hong,Chen Wei,et al.Preparation of Cr2 O3 dispersion strengthened copper composite by internal oxidation[J].Transactions ofMaterials and Heat Treatment,2008,29(5):22-25.
• [8]Poirler J P.晶体的高温塑性变形[M].关得林,译.大连:大连理工大学出版社,1989.
• [9]毛卫民,赵新兵.金属的再结晶与晶粒长大[M].北京:冶金工业出版社,1994.
• [10]Jonas J J,Sellars C M,Tegart M W J.Strength and structure under hot-working conditions[J].Int Metall Reviews,1969,14:l-24.
• [11]Sellars C M.Modelling microsmlctural development during hot rolling[J].Mater Sci Technol,1990,16(11):1072-1078.
• [12]Gronostajski Z J.Model describing the characteristic values of flow stress and strain of brass M63 and aluminium bronze BA93[J].Journal of MaterialsProcessing Technology,1998,78(1-3):84-89.
• [13]Imbert C A C,McQueen H J.Peak strength,strain hardening and dynamic restoration of A2 and M2 tool steels in hot deformation[J].MaterialsScience and Engineering A,2001,313(1-2):88-103.
• [14]王清,李中华,孙东立,等.TC4钛合金的热变形行为及其影响因素[J].材料热处理学报,2005,26(4):56-59.Wang Qing,Li Zhong-hua,Sun Dong-li,et al.Hot deformation behavior and influencing factor of TC4[J].Transactions of Materials and HeatTreatment,2005,26(4):56-59.
• [15]熊创贤,张新明,陈健美,等.Mg-Gd-Y-Mn耐热镁合金的压缩变形行为研究[J].材料热处理学报,2007,28(3):47-53.Xiong Chuang-xian,Zhang Xin-ming,Chen Jian-mei,et al.Deformation behavior of Mg-Gd-Y-Mn heat resistant magnesium alloy during hot-compression[J].Transactions of Materials and Heat Treatment,2007,28(3):47-53.
• [16]Zener C,Hollomon J H.Effect of strain-rate upon the plastic flow of steel[J].J Appl Phys,1944,15(1):22-27.

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