Investigation of Deformation Mechanisms in β-Type Ti-35Nb-2Ta-3Zr Alloy via FSP Leading to Surface Strengthening
Abstract
Friction-stir processing (FSP) is used to prepare Ti-35Nb-2Ta-3Zr alloys via different processing routes. Dislocation walls and tangles, deformation-induced α″ martensite, and deformation-induced ω phase are observed. The dominant deformation mechanisms are altered from deformation-induced α″ martensitic transformation and dislocation walls to twinning upon increasing the FSP passes. A reverse deformation-induced ω to β transformation and de-twinning process are observed together with grain refinement to the nanoscale. Meanwhile, compressive distortions along [0001]ω direction are favorable for the transformation from ω to β.
Keywords
Deformation, Friction stir welding, Grain refinement, Martensitic transformations, Niobium, Zirconium, Zirconium alloys, Deformation mechanism, Dislocation walls, Dominant deformation mechanism, Friction stir processing, Omega phase, Processing Route, Reverse deformation, Surface strengthening, Tantalum
Document Type
Journal Article
Date of Publication
2015
Publisher
Springer Boston
School
School of Engineering
RAS ID
19673
Funders
NSF, National Science Foundation;
NSF, National Science Foundation
Grant Number
51302168, 81171738
Copyright
subscription content
Comments
Wang, L., Qu, J., Chen, L., Meng, Q., Zhang, L.-C., Qin, J., Zhang, D., Lu, W. (2015). Investigation of Deformation Mechanisms in β-Type Ti-35Nb-2Ta-3Zr Alloy via FSP Leading to Surface Strengthening in Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, 46(11), 4813-4818. Available here.