Cyclic Deformation Response of Ti-5Al-5V-5Mo-3Cr (Ti-5553) Alloy under the Solutionized-Aged Condition
The cyclic deformation behavior of two phase metastable-β Ti-5Al-5V-5Mo-3Cr alloy was systematically investigated under the pull-push low cycle fatigue (LCF) tests with a total strain control testing mode at room temperature. The β-α bimodal microstructure demonstrated the microme-chanical heterogeneity upon strain cycling .leading to special macroscopic behavior, i. e. early cyclic hardening at low strain amplitude; cyclic softening when the strain amplitude was high;and initial hardening followed by softening in the intermediate strain range. The role of primary αp particles is found to be particularly important in accommodating the cyclic plastic strain. The participation of the transformed β phase including the lenticular α, precipitates embedded in the β matrix was detected at high strain amplitude. The activation of slip activities in αp mainly gave rise to initially moderate hardening response. Dislocation annihilation upon cycling both in the αp/β and αs/β interfaces on the side of αp and αs particles was found to be the main reason for the softening behavior.
Ti 5553 α-β bimodal microstructure cyclic hardening and softening micromechanism deformation heterogeneity dislocation annihilation
Jun Huang Zhirui Wang Kemin Xue
Department of Materials Science and Engineering, University of Toronto, Toronto , ON, M5S 3E4 , Cana Department of Materials Science and Engineering, HeFei University of Technology, Hefei,Anhui, 230009
国际会议
The 12th World Conference Titanium(第十二届世界钛会 Ti-2011)
北京
英文
914-918
2011-06-19（万方平台首次上网日期，不代表论文的发表时间）