Al - B (Aluminium - Boron)

Andriy Grytsiv and Peter Rogl

Comments

In spite of numerous data available from literature on the constitution of the Al-B phase diagram, contradictory results exist for the formation of aluminium diboride (Table 1). Figure 1a shows the various versions for the Al-rich part of the Al-B phase diagram. It should be noted, that recent experiments [2002Zhe] confirmed the formation of AlB₂ at 900°C, in contrast to data of [1997Via] suggesting peritectic formation at 892 ± 5°C. In the present assessment we accept the temperature of 956 ± 5°C for the invariant reaction L+AlB₁₂↔AlB₂ as determined by [2000Hal]. The adopted Al-B phase diagram (Figs. 1b, 1c) is based on the assessment of [1994Dus]. The composition of the peritectic liquid at 0.55 at.% B has been confirmed by a recent thermodynamic assessment of [2001Fje...