Microstructural evolution of two binary β-titanium alloys during cold deformation

7th International Conference on Key Engineering Materials

材料科学;工业技术

Ebied, Saad Mohamed^1 ; Gepreel, Mohamed Abdel-Hady^1 ; Hamada, Atef^1

Materials Science and Engineering Department, Egypt-Japan University of Science and Technology, Borg El Arab, Alexandria

21934, Egypt^1

关键词: Beta titanium alloy;    Chemical compositions;    Deformation mechanism;    Deformation twinning;    Dominant deformation mechanism;    Micro-structural observations;    Microstructural features;    Work hardening rate;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/201/1/012047/pdf
DOI  :  10.1088/1757-899X/201/1/012047

来源: IOP

【 摘 要 】

The deformation mechanism that reflects on the cold workability, of two beta-Ti alloys with chemical compositions of Ti-14Cr and Ti-17Mo in wt. % are studied in this work. The present alloys were solution treated at 900 °C for 1.8 ks. Followed by cold rolling with different reduction ratio from 5% to 30%. The microstructural evolution during cold deformation was followed using optical microscopy, X-ray diffraction and micro hardness. It was observed that the hardness and work hardening rate are affected significantly by the amount of cold deformation for the present Ti-alloys. It is apparent from the intensive microstructural observations that the deformation twinning (TWIP effect) is the dominant deformation mechanism in Ti-17Mo alloy at room temperature. However, the formation of slip bands and extended shear bands (SBs) were observed to be the deformation-induced microstructural features in Ti-14Cr alloy. The XRD analyses also revealed that the stress/strain induced martensitic transformation (TRIP effect) has not activated in the deformed Ti-alloys despite high deformation of 30%.