Phase transformation and mechanical properties of nanocrystalline Ti–2Fe-0.1B alloy processed by high pressure torsion

• DOI: 10.1016/j.jmrt.2024.06.164
• Publication Date: 2024-06-22T16:20:11Z
• Authors: Yu Wang; Yutong Jin; Yumeng Guo; Kai Chen; Zulei Liang; V.D. Sitdikov; Yuecheng Dong; Hui Chang; I.V. Alexandrov
• Keywords: Nanocrystalline material; Volume fraction; Titanium alloy; Severe Plastic Deformation

In this paper, nano-Ti-2Fe-0.1B alloys with different grain sizes were processed by high pressure torsion (HPT) deformation. The study examined the microstructural evolution of Ti-2Fe-0.1B alloy during HPT and evaluated its mechanical properties through microhardness tensile tests. results observations revealed that size progressively decreased from 3.14 μm in as-annealed state to approximately 20nm after 10 turns. initial state, consists -phase -phases, a volume ratio 5:1. During process, transformations observed. primary reason for is shear forces applied process facilitated phase transformation -phase. Additionally, presence Fe element altered lattice compatibility between grains -phase, thereby promoting accumulated turns fraction increased beginning gradually, then decreased, which reached maximum 80.8% 5 This higher than pure titanium Ti-Fe under same conditions, because proportion increases increase content. Studies demonstrated can substantially enhance hardness as 483 HV, strength was observed 725 MPa 1568 turns, much Ti-6Al-4V subjected identical processing conditions. It be ascribed exist mass well finer nanocrystalline alloy.