Deformation behavior of Ti-5Al-2Sn-2Zr-4Mo-4Cr alloy with two initial microstructures during hot working

作者：Luo, Jiao^*; Li, Lian; Li, Miao-quan

来源：Transactions of Nonferrous Metals Society of China, 2016, 26(2): 414-422.

DOI：10.1016/S1003-6326(16)64130-4

• titanium alloy
• isothermal compression
• flow stress
• microstructure evolution
• dynamic globularization

The effects of initial microstructure on the flow stress, strain rate sensitivity (m), strain hardening exponent (n), apparent activation energy (Q) for deformation of Ti-5Al-2Sn-2Zr-4Mo-4Cr alloy were investigated using isothermal compression tests. Results show that the alloy with Widmanstatten alpha plates shows a higher peak stress and flow softening. Additionally, the alloy with equiaxed primary alpha exhibits an early yield drop at or above 810 degrees C and at strain rates of 0.1-5.0 s(-1). In the strain range of 0.5-0.7, m of the alloy with equiaxed primary alpha is found to be larger at 0.01 s(-1) and lower deformation temperatures. This phenomenon could be reasonably explained based on the microstructure evolution. The strain has a significant effect on n of the alloy with Widmanstatten alpha plates, which is attributed to platelet bending/kinking and dynamic globularization of a phase. In the strain range of 0.15-0.55, Q of the alloy with Widmanstatten alpha plates is larger.

• 出版日期2016-2
• 单位西北工业大学