Accelerated flow softening and dynamic transformation of Ti-6Al-4V alloy in two-phase region during hot deformation via coarsening α grain

• 来源期刊: 材料科学技术（英文版）
• 年，卷（期）: 2020,（1）
• 页码范围: 160-166
• 页数: 7页
• 语种: 英文

摘要

The flow softening is an important phenomenon during hot deformation of metallic materials.In the present work,a more evident flow softening of Ti-6Al-4V alloy when deformed in two-phase region was observed in coarser α grain sample,which was attributed to an accelerated dynamic transformation from harder α phase intoβ phases.Notably,full β microstructure was observed in coarse grain samples at strain of 1.2,while retained α phase was observed in fine α grain specimens.In the views of thermodynamics and crystallographic analysis,the in-depth mechanisms of dynamic transformation were further investigated.