Formation and characterization of an Al-rich metastable phase in Al-B phase diagram

TL;DR

This study reports the discovery and detailed characterization of a metastable Al-rich phase in the Al-B system, formed via heat treatment of alloyed powders, with implications for understanding boride formation.

Contribution

It introduces a new metastable Al-rich phase with unique structure and stability, elucidating its formation and potential role as an intermediate in boride synthesis.

Findings

The phase has a chemical formula Al1.28B and rhombohedral structure.

It remains stable up to 630°C during heating.

The phase's nucleation is hindered by high elastic energy.

Abstract

Vacuum heat treatment of mechanically-alloyed powders of boron and aluminum leads to formation of a metastable Al-rich phase, which can be quenched. Its structure, composition, and thermal stability are established. With chemical formula Al1.28B the rhombohedral phase is unusually rich in Al. Parameters of the unit cell determined from X-ray powder diffraction are: a=18.3464(19) {\AA}, c=8.9241(9) {\AA}, 2601.3(6) {\AA}3, space group R-3. It is stable at heating up to 630 {\deg}C. It is suggested that this phase is an important intermediate step in formation of AlB2 and, eventually, of other borides and its nucleation and thermal stability are explained by high elastic energy hindering formation of equilibrium phases at low temperatures.