Strain Localization and Planar-slip Behavior in Compressive Cyclic Deformation of the Beta-annealed Ti-5Al-5V-5Mo-3Cr Alloy
In the present study,the cyclic deformation behavior of the β-annealed metastable Ti-5Al-5V-5Mo-3Cr alloy in pure compressive fatigue tests is thoroughly investigated. The material illustrates the initial cyclic softening followed by saturation irrespective of the employed stress levels. The progressive observation of surface-microstructure evolution reveals typical planar slip behavior and early formation of strain localizationinduced microcracks. Upon cycling,the annihilation,i, e. reduced dislocation density and simplified dislocation configurations,as well as the detwinning and changed twin boundary structures have been well illustrated by the transmission electron microscopy (TEM) investigation. These activities in combination with the arpenetration process are considered to introduce the initial softening behaviour; and the dislocation flip-flop is attributed to the following cyclic saturation response. In consideration of the stacking fault energy (SFE) ,the free-elec:ron-to-atom (e/a) ratio,and the as-received microstructure,the strain localized planar slip behavior is discussed. The shearing process of nano-scaled ω precipitates is related to the strain localization phenomenon as well.
BCC β-annealed Ti 5553 cyclic hardening softening response pure compressive fatigue planar slip strain localization dislocation configuration
Jun Huang Zhirui Wang Jie Zhou
Department of Materials Science and Engineering,University of Toronto, Toronto,ON,M5S 3E4 ,Canada Department of Materials Science and Engineering, HeFei University of Technology,He fei,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
919-923
2011-06-19（万方平台首次上网日期，不代表论文的发表时间）