In-situ synchrotron based high energy X-ray diffraction study of the deformation mechanism of {\delta}-hydride in a commercially pure titanium

TL;DR

This study uses in-situ high energy X-ray diffraction to investigate how { extdelta}-hydrides in hydrogen-charged pure titanium deform, revealing stress distributions, strain behaviors, and implications for hydrogen embrittlement.

Contribution

It provides new insights into the deformation mechanisms of { extdelta}-hydrides in pure titanium using in-situ X-ray diffraction, highlighting stress and strain behaviors.

Findings

Hydrides generate high internal and interphase stresses.

Hydrides sustain larger strains than the matrix, especially after yield.

Cracks initiate at hydrides due to their brittleness.

Abstract

We used by in-situ high energy X-ray diffraction to inestigate the deformation behavior of Grade 2 commercially pure titanium that was hydrogen charged to form hydrides. The results showed that the peak broadening in the diffraction patterns are due to the high internal and interphase stresses generated within and around hydrides due to the volume expansion induced by the phase transformation. The hydrides exhibit typical high strength but brittle secondary phase behavior, which undertakes more elastic strain than matrix and is the location where cracks are first generated. Interestingly, the {\delta}-hydrides sustain larger strains than the matrix, especially after the matrix yields. This study on the deformation mechanism of hydrides in pure titanium provides insight into the hydride deformation behavior and hydrogen embrittlement in both titanium and zirconium.