Nanocrystalline Zr3Al Made through Amorphization by Repeated Cold Rolling and Followed by Crystallization

TL;DR

This study demonstrates how repeated cold rolling induces amorphization in Zr3Al, which upon heating crystallizes into a nanocrystalline structure with small grains, revealing a novel pathway for nanostructure formation in intermetallics.

Contribution

It introduces a cold rolling and heating process to produce nanocrystalline Zr3Al with controlled grain sizes, advancing intermetallic nanostructure synthesis methods.

Findings

Amorphization achieved by cold rolling as shown by X-ray diffraction.

Nanocrystals of 10-20 nm form within the amorphous matrix.

Crystallization leads to Zr2Al phase with ~15 nm grains, then growth to ~100 nm and Zr3Al formation.

Abstract

The intermetallic compound Zr3Al is severely deformed by the method of repeated cold rolling. By X-ray diffraction it is shown that this leads to amorphization. TEM investigations reveal that a homogeneously distributed debris of very small nanocrystals is present in the amorphous matrix that is not resolved by X-ray diffraction. After heating to 773 K, the crystallization of the amorphous structure leads to a fully nanocrystalline structure of small grains (10 - 20 nm in diameter) of the non-equilibrium Zr2Al phase. It is concluded that the debris retained in the amorphous phase acts as nuclei. After heating to 973 K the grains grow to about 100 nm in diameter and the compound Zr3Al starts to form, that is corresponding to the alloy composition.