Superplastic deformation behavior of ultra-fine-grained Ti-1V-4Al-3Mo alloy: constitutive modeling and processing map

被引：13
作者：
Mosleh, A. O. [1 ,2 ]
Mikhaylovskaya, A., V [1 ]
Kotov, A. D. [1 ]
Sitkina, M. [1 ]
Mestre-Rinn, P. [3 ]
Kwame, J. S. [4 ]
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] Ecole Natl Super Mines, 158 Cours Fauriel, F-42100 St Etienne, France
[4] Univ Strathclyde, Adv Forming Res Ctr, 85 Inchinnan Dr, Inchinnan PA4 9LJ, Renfrew, Scotland
来源：
MATERIALS RESEARCH EXPRESS | 2019年 / 6卷 / 09期
基金：
俄罗斯科学基金会;
关键词：
constitutive modeling; titanium alloy; activation energy; superplasticity; processing maps; HOT DEFORMATION; MICROSTRUCTURAL EVOLUTION; FLOW BEHAVIOR; MECHANICAL-BEHAVIOR; TI-6AL-4V ALLOY; STRAIN-RATE; TITANIUM; TEMPERATURE; COMPRESSION; SIMULATION;
D O I：
10.1088/2053-1591/ab31f9
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
This paper studies the superplasticity of conventional sheets of Ti-1V-4Al-3Mo (alpha + beta) alloy. The flow behavior was investigated in a temperature range of 775 degrees C-900 degrees C and a constant strain rate range of 2 x 10(-4)-5 x 10(-3) s(-1) via uniaxial tensile tests. The microstructure evolution during the superplastic deformation was analyzed. The results revealed that, the flow behavior of Ti-1V-4Al-3Mo (alpha + beta) alloy is characterized by strain softening phenomena. The experimental stress-strain data were used to build a power law constitutive model. A processing map, which shows the safe and unsafe regions of deformation, was also constructed for the studied alloy. The optimal deformation regime was attained at a temperature of 875 degrees C and strain rate of 1 x 10(-3) s(-1) which provided a beta phase fraction of 52%. Equiaxed fine-grained alpha and beta structure with size of 2-3 mu m as well as dislocation activity inside the alpha-grains were identified in the optimum deformation regime.
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页数：9
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