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Title: Thixoforming of A356/SiC and A356/TiB2 Nanocomposites Fabricated by a Combination of Green Compact Nanoparticle Incorporation and Ultrasonic Treatment of the Melted Compact
Authors: Kandemir, S.
Atkinson, Helen V.
Weston, David P.
Hainsworth, Sarah V.
First Published: 14-Aug-2014
Publisher: Springer US for Minerals, Metals and Materials Society (TMS)
Citation: Metallurgical and Materials Transactions A, 2014, 45A (12), pp. 5782-5798 (17)
Abstract: Thixoforming is a type of semi-solid processing which is based on forming metals in the semi-solid state rather than fully liquid or solid state. There have been no reports of the thixoforming of nanocomposites in the literature. The incorporation of ceramic nanoparticles into liquid metals is a challenging task for the fabrication of metal matrix nanocomposites due to their large surface-to-volume ratio and poor wettability. Previous research work by a number of workers has highlighted the challenges with the incorporation of nanoparticles into liquid aluminum alloy. In the present study, SiC and TiB2 nanoparticles with an average diameter between 20 and 30 nm were firstly incorporated into green compacts by a powder forming route, and then the compacts were melted and treated ultrasonically. The microstructural studies reveal that the engulfment and relatively effective distribution of the nanoparticles into the melt were achieved. The hardness was considerably improved with only 0.8 wt pct addition of the nanoparticles. The nanocomposites were successfully thixoformed at a solid fraction between 0.65 and 0.70. The microstructures, hardness, and tensile mechanical properties of the thixoformed nanocomposites were investigated and compared with those of the as-received A356 and thixoformed A356 alloys. The tensile properties of the thixoformed nanocomposites were significantly enhanced compared to thixoformed A356 alloy without reinforcement, indicating the strengthening effects of the nanoparticles.
DOI Link: 10.1007/s11661-014-2501-0
ISSN: 1073-5623
eISSN: 1543-1940
Version: Post-print
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © The Minerals, Metals & Materials Society and ASM International 2014. The final publication is available at Springer via The file attached to this record is distributed under the Creative Commons “Attribution Non-Commercial No Derivatives” licence, further details of which can be found via the following link:
Appears in Collections:Published Articles, Dept. of Engineering

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