Abstract
The deformation mechanisms of Ti-10Mo (wt.%) alloy subjected to different quasi-hydrostatic pressure values were investigated under constrained compression using stage of high-pressure torsion apparatus. Deformation products contain {332}<113> mechanical twinning, stress-induced α″ martensitic phase and stress-induced ω phase. A volume expansion accompanied stress-induced α″ martensitic phase transformation is 2.06%. By increasing the applied pressure from 2.5 GPa to 5 GPa, the dominant deformation mechanism underwent a transition from stress-induced α″ martensitic phase transformation to {332}<113> mechanical twinning.
Highlights
Metastable β titanium alloys are potentially attractive for applications in several industrial fields, such as aerospace applications and biomedical devices, thanks to their unique combination of high specific strength-to-density ratio, low elastic modulus, excellent corrosion resistance, good biocompatibility and good formability [1,2,3]
The deformation modes in Ti-10Mo alloy at different quasi-hydrostatic pressures had been investigated
Two quasi-hydrostatic pressure values of 2.5 GPa and 5 GPa were imposed on the samples by the compression stage of high-pressure torsion (HPT) processing
Summary
Metastable β titanium alloys are potentially attractive for applications in several industrial fields, such as aerospace applications and biomedical devices, thanks to their unique combination of high specific strength-to-density ratio, low elastic modulus, excellent corrosion resistance, good biocompatibility and good formability [1,2,3]. There are several possible deformation mechanisms in metastable β titanium alloys, including dislocation slip, mechanical twinning, stress-induced martensitic (SIM) transformation or a combination of these, as a function of β phase stability [4,5,6,7,8,9,10,11]. The β phase stability, which is a function of its composition, is commonly gauged by the Moeq , an equivalent binary Ti-Mo alloy concentration. In order to obtain a full β phase structure in a binary Ti-Mo alloy, a minimum of 10wt.% Mo is required to prevent the martensitic transformation upon quenching to ambient temperature [13]. The dominant deformation mechanisms will change from dislocation slip to mechanical twinning and to SIM transformation with decreasing levels of β phase stability. Some studies about the temperature sensitivity and strain rate sensitivity
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