The tensile and tensile-creep deformation behavior of Ti-8Al-1Mo-1V(wt%)

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:636

Article

Dastidar, I. G.¹  Khademi, V.^1,3  Bieler, T. R.¹  Pilchak, A. L.²  Crimp, M. A.¹  Boehlert, C. J.¹ 

[1] Michigan State Univ, Dept Chem Engn & Mat Sci, E Lansing, MI 48824 USA

[2] AFRL RXCM, Air Force Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA

[3] Michigan State Univ, Dept Mech Engn, E Lansing, MI 48824 USA

关键词: In-situ SEM;    EBSD;    Tension;    Creep;    Titanium alloy;    Deformation mode;   

DOI  :  10.1016/j.msea.2015.03.059

来源: Elsevier

【 摘 要 】

The deformation behavior of titanium (Ti) can be complex due to the lower crystal symmetry of the hexagonal a phase compared with metals based on cubic phases. The tensile and tensile-creep deformation behavior of a Ti-8Al-1Mo-1V(wt%) alloy with a weak crystallographic texture was investigated in-situ straining scanning electron microscopy. Tensile experiments were performed at room temperature (RT), 260 degrees C, 455 degrees C, and 650 degrees C, while tensile-creep experiments were performed at 370 degrees C and 455 degrees C. Electron backscattered diffraction (EBSD) was performed both before and after the deformation, and slip trace analysis was used to identify the activation of the slip modes as a function of temperature and the associated global-stress-state Schmid factors. While extensive slip was characterized during the tensile tests, no twinning was observed. During the RT tensile tests the majority of the slip observed was on prismatic planes, while the relative activity of basal slip increased with temperature, such that at 455 degrees C, basal slip and prismatic slip were equally active. Some grain boundary and triple point cracking occurred during the elevated-temperature tensile deformation, while less slip activity and more grain boundary ledge formation were observed during the tensile-creep deformation. During tensile-creep, basal slip was more prevalent than prismatic slip and some transgranular cracks formed. (C) 2015 Elsevier B.V. All rights reserved.

【 授权许可】

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