Superplastic deformation behaviour and microstructure evolution of near-α Ti-Al-Mn alloy

被引：42
|
作者：
Mikhaylovskaya, A. V. [1 ]
Mosleh, A. O. [1 ,2 ]
Kotov, A. D. [1 ,5 ]
Kwame, J. S. [4 ]
Pourcelot, T. [1 ,3 ]
Golovin, I. S. [1 ]
Portnoy, V. K. [1 ]
机构：
[1] Natl Univ Sci & Technol MISiS, Leninsky Prospekt 4, Moscow 119049, Russia
[2] Benha Univ, Shoubra Fac Engn, Shoubra St 108,PO 11629, Cairo, Egypt
[3] European Sch Engineers & Mat Sci Nancy EEIGM, F-54000 Nancy, France
[4] Univ Strathclyde, Adv Forming Res Ctr, 85 Inchinnan Dr, Inchinnan PA4 9LJ, Renfrew, Scotland
[5] Natl Res Univ, Higher Sch Econ, Moscow Inst Elect & Math, Tallinskaya 34, Moscow 123458, Russia
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2017年 / 708卷
关键词：
Superplasticity; Titanium alloys; Microsize grain structure; Dislocation structure; ENHANCED SUPERPLASTICITY; TITANIUM-ALLOY; TEXTURE EVOLUTION; STRAIN-RATE; HIGH-TEMPERATURE; TI-6AL-4V ALLOY; FLOW BEHAVIOR; GRAIN-GROWTH; HOT-WORKING; MECHANISMS;
D O I：
10.1016/j.msea.2017.10.017
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Superplastic deformation behaviour of conventional sheets of a near-alpha titanium alloy (Ti-2.5A1-1.8Mn) was studied by a step-by-step decrease of the strain rate and constant strain rate tests in a temperature range of 790-915 degrees C. The research found that superplastic deformation is possible in a temperature range of 815-890 degrees C and a constant strain rate range of 2 x 10(-4) to 1 X 10(-3) s(-1) with elongation above 300% and m-index above 0.4. Also, the research identified the optimum superplastic temperature range of 815-850 degrees C and constant strain rate of 4 x 10(-4) s(-1) which provide a maximum elongation of 600-650%. Strain hardening is accelerated by dynamic grain growth at high temperatures of 865 and 890 degrees C. High dislocation activity is observed at super plastic flow in alpha-phase. Constitutive modelling of superplastic deformation behaviour is performed, and possible deformation mechanisms are discussed. It is suggested that grain boundary sliding between the alpha-grains is accommodated by a dislocation slip/creep mechanism.
引用
收藏
页码：469 / 477
页数：9
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