Formation mechanisms of Cr₂AlB₂, Cr₃AlB₄, and Fe₂AlB₂ MAB phases

Figures & data

Figure 1. Crystal structures of (A) CrB, (B) ß-FeB, (C) Cr₃B₄, (D) M₂AlB₂ and (E) M₃AlB₄.

Table 1. Initial compositions and quenching temperatures.

Initial molar composition	Temperatures
2CrB + 1.5 Al	680°C
	820°C
	970°C
	970°C – 15 h
3CrB + 1.5Al + 1B	680°C
	750°C
	820°C
	1020°C
	1020°C – 10 h
2 ß-FeB + 1.5 Al	680°C
	850°C
	1050°C
	1050°C - 10 h

Figure 2. XRD patterns for 2 CrB + 1.5 Al quenched from, (A) 680°C, (B) 820°C, and (C) 970°C. For reference, (D) 970°C for 15 h. (E) The ratio of Cr₂AlB₂ to CrB over the range of quenching temperatures and after a 15 h at 970°C.

Figure 3. XRD patterns of 3 CrB + 1.5 Al + 1 B after quenching from (A) 680°C, (B) 750°C, (C) 820°C, and (D) 1020°C. For reference, (E) 1020°C for 10 h. (F) The ratio of Cr₃AlB₄ to CrB over the range of quenching temperatures and after 10 h at 1020°C

Figure 4. XRD patterns of 2 ß-FeB + 1.5 Al after quenching from (A) 680°C, (B) 850°C, and (C) 1050°C. For reference, (D) 1050°C for 10 h. (E) The ratio of Fe₂AlB₂ to FeB over the range of quenching temperatures and after 10 h at 1050°C.