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The Consolidation Behavior of L12 Phase Al3Zr & (Al+12.5at%)3Zr Powders with Nanocrystalline Structure During Spark Plasma Sintering

Published online by Cambridge University Press:  17 March 2011

Kyoung Il Moon ,
Seung Chul Kim  and
Kyung Sub Lee
Kyoung Il Moon
Affiliation:
Div. of Materials Science and Engineering, Hanyang University, Seoul 133-791, Korea
Seung Chul Kim
Affiliation:
Div. of Materials Science and Engineering, Hanyang University, Seoul 133-791, Korea
Kyung Sub Lee
Affiliation:
Div. of Materials Science and Engineering, Hanyang University, Seoul 133-791, Korea
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Abstract

The spark plasma sintering (SPS) of L12 phase Al3Zr and (Al+12.5at.%Cu)3Zr powders with a nanocrystalline microstructure has been studied to produce bulk intermetallic compounds which maintain metastable structures such as L12 structure and nanocrystalline microstructure. The powders were prepared by 10 h planetary ball milling (PBM). Full-density L12 (Al+12.5at.%Cu)3 Zr intermetallic compounds were obtained by SPS for 0 min. at 600°C. The smallest grain size was obtained in the specimen prepared at 600°C for 0 min., which was 20-30 nm as confirmed by TEM observation. Accordingly, the highest micro-hardness, 989.5 HV, was obtained in the specimen and this value was three times higher than those of the specimens with micro grain sizes. Full density Al3Zr intermetallics were prepared by SPS at 700°C for 0 min.. However, their crystal structure was D023 and micro-hardness was 778.1 HV. By using SPS, the sintering time can be reduced within 10 min.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 704: Symposium W – Nanoparticulate Materials , 2001 , W6.9.1
Copyright
Copyright © Materials Research Society 2002

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References

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