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.
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