174. phase stability dependence of deformtion microstucture and mechnical properties in ti-nb gum metal

Department: Mechanical & Aerospace Engineering
Research Institute Affiliation: Graduate Program in Materials Science and Engineering
Faculty Advisor(s): Kenneth S. Vecchio

Primary Student
Name: Sumin Shin
Email: sus020@ucsd.edu
Phone: 858-337-4916
Grad Year: 2018

Evolution of microstructure and deformation modes of cold-rolled Ti-23Nb-0.7Zr-0.3O alloy were investigated with different solution treatment. This alloy, referred to as gum metal, has been reported to possess high ductility without work hardening, and low Young?s modulus obtained by cold working metastable &#946; phase. Recent studies suggest that both mechanical twinning and stress-induced phase transformation play an important role in enhancing the work hardening and thus improving the mechanical properties. In this study, we studied the effect of the elemental distribution on the phase stability with the Bo-Md map, and to discuss the deformation modes which possibly enhance the mechanical properties by controlling the deformation microstructure. Analysis of the deformed microstructure using electron backscatter diffraction and X-ray diffraction revealed that deformation bands are composed of {332}<112>twin, {112}<111>twin, and stress induced martensite(&#9082;&#1524;) phase, and the number of bands decreases with increasing the homogeneity of the elemental distribution in the alloy.

Industry Application Area(s)

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