Pilling-Bedworth ratio for oxidation of alloys

Abstract

Based on the theory of Pilling-Bedworth ratio (PBR) for metals, PBR for oxidation of alloys is suggested as Three Al₂O₃ forming alloys (Ni₃Al, NiAl and NiAl₃) were used as examples to calculate PBR with this method. The results showed significant discrepancies compared with the PBR calculated with aluminium metal. Calculation with the traditional method gave the PBR value for oxidation of Al as 1.29; calculations with the modified method gave the PBR values for Ni₃Al, NiAl and NiAl₃ alloys as 1.71∼1.88, 1.64∼1.78, and 1.48∼1.57, respectively.

Key words:

• Oxidation
• Alloy
• B-P ratio
• Ni-Al intermetallics