# Could face-centered cubic titanium in cold-rolled commercially-pure titanium only be a Ti-hydride?

## TL;DR

This study confirms that the face-centered cubic phase observed in cold-rolled commercially pure titanium is actually a Ti hydride (TiHx), not a new titanium allotrope, using advanced microscopy and spectroscopy techniques.

## Contribution

The paper provides definitive evidence that the FCC phase in cold-rolled titanium is a Ti hydride, clarifying previous ambiguities about its nature.

## Key findings

- FCC phase is a Ti hydride (TiHx) with x>1.
- Advanced microscopy confirms the chemical composition.
- Hydride formation mechanisms are discussed.

## Abstract

A face-centered cubic (FCC) phase in electro-polished specimens for transmission electron microscopy of commercially pure titanium has sometimes been reported. Here, a combination of atom-probe tomography, scanning transmission electron microscopy and low-loss electron energy loss spectroscopy is employed to study both the crystal structural and chemical composition of this FCC phase. Our results prove that the FCC phase is actually a TiHx (x>1) hydride, and not a new allotrope of Ti, in agreement with previous reports. The formation of the hydride is discussed.

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Source: https://tomesphere.com/paper/1907.01583