徐铁伟,李金山,张丰收,刘向宏,冯勇,薛祥义

• 1:西北工业大学材料学院
• 2:西部超导材料科技股份有限公司

摘要(Abstract)：

利用场发射扫描电镜(FE-SEM),X射线衍射仪(XRD),差热分析仪(DSC)等测试手段和分析方法,比较系统地研究了TB8钛合金的双级时效过程中组织演变及强化响应行为。结果表明:TB8钛合金在400℃/1 h预时效时β基体析出ω相,而在随后进行的500℃终级时效时ω相转变为α相。随着终级时效的持续,合金的硬度明显提高,合金析出α相的数量不断增加,尤其(101)α的衍射峰强度明显增强。经FE-SEM、DSC和XRD的结果分析发现,预时效处理产生了较多的细小弥散析出相,成为α沉淀相的转变基础,终级时效在5.5 h时基本完成相转变,而双级时效有利于减小析出α相的尺寸。

关键词(KeyWords)： 双级时效;组织演变;钛合金;时效响应

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 徐铁伟,李金山,张丰收,刘向宏,冯勇,薛祥义

DOI: 10.13289/j.issn.1009-6264.2016.02.011

参考文献(References)：

• [1]CHEN Yu-yong,DU Zhao-xin,XIAO Shu-long,et al.Effect of aging heat treatment on microstructure and tensile properties of a newβhigh strength titanium alloy[J].J Alloys and Compd,2014,586:588-592.
• [2]Julien Da Costa Teixeira,Benoit Appolaire,Elisabeth Aeby Gautier,et al.Transformation kinetics and microstructures of Ti17 titanium alloy during continuous cooling[J].Mater Sci Eng A,2007,448:135-145.
• [3]DU Zhao-xin,XIAO Shu-long,XU Li-juan,et al.Effect of heat treatment on microstructure and mechanical properties of a newβhigh strength titanium alloy[J].Mater Des,2014,55:183-190.
• [4]CAI Ming-Hui,Lee Han-Yong,Lee Yong-Kook.Effect of grain size on tensile properties of fine-grained metastableβtitanium alloys fabricated by stress-induced martensite and its reverse transformations[J].Scripta Mater,2012,66:606-609.
• [5]WANG Li-qiang,LU Wei-jie,QIN Ji-ning,et al.Microstructure and mechanical properties of cold-rolled Ti Nb Ta Zr biomedicalβtitanium alloy[J].Mater Sci Eng A,2008;490:421-426.
• [6]Santhosh R,Geetha M,Saxena V K,et al.Studies on single and duplex aging of metastable beta titanium alloy Ti-15V-3Cr-3Al-3Sn[J].J.Alloys and Compd,2014,605:222-229.
• [7]El-Chaikh A,Schmidt P,Christ H J.Fatigue properties of duplex-aged Ti 38-644 metastable beta titanium alloy[J].Procedia Engineering 2,2010,1973-1982.
• [8]Schmidt P,El-Chaikh A,Christ H J.Effect of duplex aging on the initiation and propagation of fatigue cracks in the solute-rich metastableβtitanium alloy Ti 38-644[J].Metall Mater Trans A,2011,42:2652-2667.
• [9]Rodney Boyer,Gerhard Welsch,Collings E W.Materials Properties Handbook:Titanium Alloys[M].OH:ASM International Materials Park,1994.
• [10]Nag S,Banerjee R,Srinivasan R,et al.ω-Assisted nucleation and growth ofαprecipitates in the Ti-5Al-5Mo-5V-3Cr-0.5Feβtitanium alloy[J].Acta Mater,2009,57:2136-2139.
• [11]Qazi J I,Marquardt B,Allard L F,et al.Phase transformations in Ti-35Nb-7Zr-5Ta-(0.06-0.68)O alloys[J].Mater Sci Eng C,2005,25:389-397.
• [12]Yasuya Ohmori,Toshitaka Ogo,Kiyomichi Nakai,et al.Effects ofω-phase precipitation onβ→α,α″transformations in a metastableβtitanium alloy[J].Metall Mater Trans A,2001,312:182-188.
• [13]Karthikeyana T,Dasgupta Arup,Khatirkar R,et al.Effect of cooling rate on transformation texture and variant selection duringβ→αtransformation in Ti-5Ta-1.8Nb alloy[J].Mater Sci Eng A,2010,528:549-558.
• [14]Aeby-Gautiera E,Settefratia A,Bruneseauxa F,et al.Isothermalα″formation inβmetastable titanium alloys[J].J Alloys and Compd,2012;577:439-443.

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