Point defect concentrations and hardening in binary B2 intermetallics

Journal Article · Mon Sep 01 04:00:00 EDT 1997 · Acta Materialia

DOI:https://doi.org/10.1016/S1359-6454(97)00028-1· OSTI ID:540952

Pike, L M; Chang, Y A ^[1]; Liu, C T ^[2]

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1. Univ. of Wisconsin, Madison, WI (United States). Dept. of Materials Science and Engineering
2. Oak Ridge National Lab., TN (United States). Metals and Ceramics Div.

Point defect hardening in binary B2 intermetallic compounds with the anti-structure defect structure (FeCo and AuZn) and the triple defect structure (NiAl, FeAl, and CoAl) was investigated. Thermodynamic modeling combined with experimental measurements of lattice parameters and bulk densities were used to establish point defect concentrations as functions of composition and temperature. Microhardness measurements were made on samples of varying compositions and quenching temperatures. Solution hardening rates of vacancies were found to be significantly larger than those of anti-site defects. It was possible to relate the hardening rates of anti-site defects to the magnitude of the lattice dilation. This suggests that the elastic size effect was the primary hardening mechanism. No such correlation was found for vacancies.

• OSTI ID: 540952
• Journal Information: Acta Materialia, Journal Name: Acta Materialia Journal Issue: 9 Vol. 45; ISSN 1359-6454; ISSN ACMAFD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
BINARY ALLOY SYSTEMS
BULK DENSITY
CHEMICAL COMPOSITION
COBALT ALLOYS
CRYSTAL DEFECTS
GOLD ALLOYS
INTERMETALLIC COMPOUNDS
IRON ALLOYS
LATTICE PARAMETERS
MICROHARDNESS
NICKEL ALLOYS
THERMODYNAMIC MODEL
ZINC ALLOYS