Title

Synthesis of bulk nanostructured aluminum alloy component through vacuum plasma spray technique

Authors

Authors

T. Laha; A. Agarwal; T. McKechnie; K. Rea;S. Seal

Comments

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Abbreviated Journal Title

Acta Mater.

Keywords

aluminum alloys; plasma spraying; rapid solidification; splat quenching; nanostructured bulk component; STACKING-FAULT ENERGIES; HALL-PETCH RELATIONSHIP; AL-SI ALLOYS; NANOCRYSTALLINE MATERIALS; THERMODYNAMIC ASSESSMENT; NI SYSTEM; MICROSTRUCTURE; POWDERS; METALS; DEFORMATION; Materials Science, Multidisciplinary; Metallurgy & Metallurgical; Engineering

Abstract

The benefits of large-size engineering components with nanocrystalline structure (providing improved strength) are yet to be realized due to processing difficulties and associated grain growth problems. In this work, a free-standing bulk nanocrystalline structure of hyper-eutetic aluminum alloy (Al-21wt.%Si) has been fabricated through the vacuum plasma spray (VPS) forming technique using micron-size powder feedstock. Optical microscopy, scanning electron microscopy and transmission electron microscopy have been used to investigate the evolution of multi-scale microstructure as the result of rapid solidification in VIIS forming process. The characterization implies the presence of nanosized eutectic Al-Si grains (25-100 nm) With uniformly distributed Ultrafine primary silicon particles of submicron size. The effect of microstructural evolution on mechanical properties has been studied by tensile testing and microhardness measurement. A considerable improvement in ultimate tensile strength and hardness of the sprayed deposit has been observed in comparison with conventionally cast hypereutectic Al-17wt.%Si alloys. (c) 2005 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Journal Title

Acta Materialia

Volume

53

Issue/Number

20

Publication Date

1-1-2005

Document Type

Article

Language

English

First Page

5429

Last Page

5438

WOS Identifier

WOS:000235919800016

ISSN

1359-6454

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