Recrystallization behavior of boron-doped Ni{sub 76}Al{sub 24}

Journal Article · Tue Dec 01 04:00:00 EST 1998 · Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science

DOI:https://doi.org/10.1007/s11661-998-0196-9· OSTI ID:316026

Chowdhury, S G; Jena, A K; Ray, R K ^[1]

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1. Indian Inst. of Technology, Kanpur (India). Dept. of Materials and Metallurgical Engineering

Considerable hardness recovery and almost complete restoration of order were observed during annealing of 85 pct cold-rolled boron-doped Ni{sub 76}Al{sub 24} prior to recrystallization. Recrystallization kinetics were investigated over a wide range of temperatures at small intervals of transformed volume fraction. The variation of transformed volume fraction with time showed two unusual distinct regions characterized by separate Avrami exponents and activation energies. The exponent decreased from 2.2 at 800 C to 0.7 at 950 C for X > 0.6 and had a temperature-insensitive value of 3 for X > 0.6. The activation energy below 900 C was 145 kJ/g atom. Equations for the kinetics have been derived based on concurrent recovery in the untransformed regions during recrystallization. The predictions of the equation agree exceedingly well with the experimental results and yield separate values of the activation energies for interface migration and recovery.

• Sponsoring Organization: USDOE
• OSTI ID: 316026
• Journal Information: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, Journal Name: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science Journal Issue: 12 Vol. 29; ISSN MMTAEB; ISSN 1073-5623
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ACTIVATION ENERGY
ALUMINIUM ALLOYS
BORON ADDITIONS
INTERMETALLIC COMPOUNDS
KINETICS
NICKEL ALLOYS
PREDICTION EQUATIONS
RECRYSTALLIZATION
TEMPERATURE RANGE 1000-4000 K