Mechanical Response and Deformation Mechanisms of TB17 Titanium Alloy at High Strain Rates

Xinchi Chen,Kechao Zhou,Xiaoyong Zhang,Chao Chen

doi:10.3390/pr9030484

Abstract

The mechanical response and deformation mechanisms of TB17 titanium alloy were studied at room temperature by the split-Hopkinson pressure bar test. The ultimate compression strength increases from 1050 MPa to 1400 MPa, as the strain rate increases from 2000 s−1 to 2800 s−1. The adiabatic shear failure occurred at strain rate 2800 s−1. When the strain rate was 2000 s−1, only {10 9 3}<331>β type II high index deformation twins, a small number of α” martensite, and interfacial ω phase were detected. When the strain rate was 2400 s−1 and above, multiple deformation mechanisms, including the primary {10 9 3}<331>β type II high index deformation twins, secondary {332}<113>β deformation twins, and α” martensite were identified. The deformation mechanism changes from primary deformation twins and α” martensite to multiple deformation mechanisms (primary and secondary deformation structure) with the increase of strain rates.

Highlights

TB17 Titanium Alloy at High StrainMetastable β titanium alloys with low stacking fault energy have attracted considerable attraction due to their combination of extraordinary strength and ductility through different deformation mechanisms, such as dislocation slip, deformation twinning, and α”martensite transformation [1,2,3,4,5]
The β stability has a great influence on the deformation mechanism of metastable β titanium alloys
It was found that the {332}β twin was the main deformation mode in low Mo equivalent content, while slip was the main deformation mode in high Mo equivalent content

Summary

Introduction

TB17 Titanium Alloy at High StrainMetastable β titanium alloys with low stacking fault energy have attracted considerable attraction due to their combination of extraordinary strength and ductility through different deformation mechanisms, such as dislocation slip, deformation twinning, and α”martensite transformation [1,2,3,4,5]. Metastable β titanium alloys with low stacking fault energy have attracted considerable attraction due to their combination of extraordinary strength and ductility through different deformation mechanisms, such as dislocation slip, deformation twinning, and α”. The β stability has a great influence on the deformation mechanism of metastable β titanium alloys. It was found that the {332}β twin was the main deformation mode in low Mo equivalent content, while slip was the main deformation mode in high Mo equivalent content. The deformation parameters, such as temperature, strain level, and strain rate, influence the deformation mechanism of metastable β-Ti alloys greatly [7,9,11]. Gao et al [7] carried out tensile tests on a Ti-23Nb0.7Ta-2Zr-0.5N alloy and systematically studied the samples with Electron Backscattered

Methods

Results

Conclusion