李慧中,曾敏,梁霄鹏,刘咏,李洲,陈健美

• 1:湖南涉外经济学院机械工程学院
• 2:中南大学材料科学与工程学院
• 3:中南大学粉末冶金国家重点实验室

摘要(Abstract)：

采用Gleeble-1500热模拟实验机及光学显微镜和透射电子显微镜研究了Ti-47Al-2Cr-0.2Mo(原子分数,%)合金在2.5 s-1,1050～1150℃,道次保温时间分别为1 min、5 min、10 min条件下的多道次热压缩变形行为及其组织演化规律。结果表明,增大道次变形量,合金软化率增大;随着道次间保温时间的延长,合金软化率逐渐增大;变形及保温温度升高,合金软化率提高。动态和亚动态再结晶是合金发生软化的主要原因。再结晶优先发生于层片晶团边界处。随着变形温度升高,γ晶粒内的孪生增多。经过热压缩变形后,组织被细化和均匀化。位错和孪生是主要的变形机制。

关键词(KeyWords)： TiAl基合金;多道次热变形;静态软化;动态再结晶

Abstract:

Keywords:

基金项目(Foundation): 国家“863”计划项目(2008AA03A233);; 国家“973”项目(2011CB605505);; 国家自然科学基金面上项目(51174233)

作者(Author): 李慧中,曾敏,梁霄鹏,刘咏,李洲,陈健美

DOI: 10.13289/j.issn.1009-6264.2012.04.024

参考文献(References)：

• [1]Kim Y W,Dimiduk D.Progress in the understanding of gamma titanium aluminides[J].Journal of the Minerals Metals and Materials Society,1991,43(8):40-47.
• [2]YUAN Zhi-shan,CHEN Sun-yuan,ZHOU Li,et al.Effect of heat treatment on microstructures and properties of near-isothermally forged TiAl alloy[J].Transactions of Materials and Heat Treatment,2004,25(5):256-259.
• [3]黄劲松,黄岚,张永红,等.热处理工艺对Ti-45Al-7Nb-0.15B-0.7W合金微观组织的影响[J].材料热处理学报,2006,27(6):78-83.HUANG Jin-song,HUANG Lan,ZHANG Yong-hong,et al.Effect of heat treatment on microstructure of Ti-45Al-7Nb-0.15B-0.7W alloy[J].Transactions of Materials and Heat Treatment,2006,27(6):78-83.
• [4]Bacos M P,Morel A,Naveos S,et al.The effect of long term exposure in oxidising and corroding environments on the tensile properties of two gamma-TiAl alloys[J].Intermetallics,2006,14(1):102-113.
• [5]Wu X H.Review of alloy and process development of TiAl alloys[J].Intermetallics,2006,14(10-11):1114-1122.
• [6]李慧中,李洲,刘咏,等.TiAl基合金的高温塑性变形行为[J].中国有色金属学报,2010,20(1):79-85.LI Hui-zhong,LI Zhou,LIU Yong,et al.Plastic deformation behavior of TiAl based alloy at high temperature[J].The Chinese Journal of Nonferrous Metals.2010,20(1):79-85.
• [7]LI H Z,LI Z,ZHANG W,et al.High temperature deformability and microstructural evolution of Ti-47Al-2Cr-0.2Mo alloy[J].Journal of Alloys and Compounds,2010,508(2):359-363.
• [8]HUANG J S,HUANG L,LIU B,et al.Simulation of hot compression of TiAl alloy[J].Intermetallics,2007,15(5-6):700-705.
• [9]孔凡涛,张树志,陈玉勇.Ti-46Al-2Cr-4Nb-Y合金的高温变形及加工图[J].中国有色金属学报,2010,20(Z1):233-236 KONG Fan-tao,ZHANG Shu-zhi,CHEN Yu-yong.Hot deformation and processing map of Ti-46Al-2Cr-4Nb-Y alloy[J].The Chinese Journal of Nonferrous Metals,2010,20(Z1):233-236.
• [10]林启权,彭大暑,张辉,等.2519铝合金热压缩变形过程的动态与静态软化行为[J].中南大学学报:自然科学版,2005,36(2):183-187.LIN Qi-quan,PENG Da-shu,ZHANG Hui,et al.Dynamic and static softening behaviors of2519aluminum alloy during multi-stage hot compression deformation[J].Journal of Central South University:Science and Technology,2005,36(2):183-187.
• [11]李俊鹏,沈健,闫晓东,等.多道次热压缩过程中7050铝合金的再结晶行为[J].中国有色金属学报,2009,19(10):1754-1758.LI Jun-peng,SHEN Jian,YAN Xiao-dong,et al.Recrystallization behavior of7050aluminum alloy during multi-pass hot compression process[J].The Chinese Journal of Nonferrous Metals,2009,19(10):1754-1758.
• [12]Rao K P,Prasad Y K D V,Hawbolt E B.Study of fractional softening in multi-stage hot deformation[J].Journal of Materials Processing Technology,1998,77(1-3):166-174.
• [13]赵磊,郑为为,杨王玥,等.Q235碳素钢多道次热变形中的组织演变及性能[J].北京科技大学学报,2004,26(5):507-511.ZHAO Lei,ZHENG Wei-wei,YANG Wang-yue,et al.Microstructure evolution and properties of Q235plain carbon steel in multi-pass hot deformation[J].Journal of University of Science and Technology Beijing,2004,26(5):507-511.
• [14]蒋呐,李劲风,郑子樵,等.2195铝锂合金多道次热变形流变应力的模拟研究[J].稀有金属材料与工程,2007,36(6):949-953.JIANG Na,LI Jin-feng,ZHENG Zi-qiao,et al.Simulation on flow stress of multi-pass hot deformation of2195Al-Li alloy[J].Rare Metal Materials and Engineering,2007,36(6):949-953.
• [15]王蕊宁,奚正平,赵永庆,等.热变形参数对Ti53311S合金组织的影响[J].金属热处理,2008,33(3):79-82.WANG Rui-ning,XI Zheng-ping,ZHAO Yong-qing,et al.Effect of hot deformation parameters on the microstructure of Ti53311S alloy[J].Heat Treatment of Metals,2008,33(3):79-82.
• [16]Clemens H,Chladil H F,Wallgram W,et al.In-and ex-situ investigations of theβ-phase in a Nb and Mo containingγ-TiAl based alloy[J].Intermetallics,2008,16(6):827-833.
• [17]张俊红,黄伯云,周科朝,等.包套轧制制备TiAl基合金板材[J].中国有色金属学报,2001,11(6):1055-1058.ZHANG Jun-hong,HUANG Bai-yun,ZHOU Ke-chao,et al.Pack rolling of TiAl based alloy[J].The Chinese Journal of Nonferrous Metals,2001,11(6):1055-1058.

文章评论(Comment)：