Thermal expansion behaviors in nanocrystalline materials with a wide grain size range

Journal Article · Fri Sep 01 04:00:00 EDT 1995 · Acta Metallurgica et Materialia

DOI:https://doi.org/10.1016/0956-7151(95)00035-T· OSTI ID:105980

Lu, K ^[1]; Sui, M L ^[1]

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1. Academia Sinica, Shenyang (China)

Thermal expansion behavior of nanocrystalline (NC) Ni-P alloy samples with grain sizes ranging from a few to 127 nm were studied experimentally using thermal mechanical analysis. Porosity-free NC Ni-P samples with a wide grain size range were synthesized by completely crystallizing amorphous Ni-P alloy at different annealing temperatures. Measurements showed that the linear thermal expansion coefficient ({alpha}{sub L}) increases markedly with a reduction of the average grain size in the as-crystallized NC Ni-P samples. The thermal expansion coefficient was also found to decrease during grain growth in the as-crystallized NC sample upon annealing. From the grain size dependence of {alpha}{sub L} in these NC samples, the authors deduced that the differences in thermal expansion coefficients between the interfaces and the nm-sized crystallites diminishes when the grain size becomes smaller. This tendency agrees well with other experimental results on the structural characteristics of the interfaces and the nm-sized crystallites in NC materials.

• Sponsoring Organization: USDOE
• OSTI ID: 105980
• Journal Information: Acta Metallurgica et Materialia, Journal Name: Acta Metallurgica et Materialia Journal Issue: 9 Vol. 43; ISSN 0956-7151; ISSN AMATEB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANNEALING
GRAIN BOUNDARIES
GRAIN GROWTH
GRAIN SIZE
INTERFACES
NICKEL
PHOSPHORUS
SAMPLE PREPARATION
TEMPERATURE DEPENDENCE
THERMAL EXPANSION