Fabrication of Aluminum-Alumina Metal Matrix Composite Coatings Via Cold Gas Dynamic Spraying at Low Pressure Followed by Friction-Stir Processing
By K. Hodder, A. Gerlich, J. Villafuerte, A. McDonald. International Thermal Spray Conference, 2012
157 citations recorded by the source corpus.
Cold gas dynamic spraying (“cold spraying”) at low pressure (150 psig) was used to fabricate Al-Al2O3 metal-matrix composite (MMC) coatings onto 6061 Al alloy. The powder contained -45 µm Al stock powder admixed with -10 Al2O3 in fractions ranging from 0-90 wt%. Scanning electron microscopy (SEM), Vickers microhardness testing, and image analysis were conducted on the as-sprayed coatings. The coatings were then friction-stir processed (FSP) using a milling machine and a 12 mm diameter cylindrical tool. Microhardness testing, SEM, and image analysis were then repeated to study the effect that FSP had on the MMC coating hardness. Hardness increased with increasing fraction of Al2O3 in the feedstock powder, resulting in a maximum as-sprayed coating hardness of 85 HV when 90 wt% Al2O3 is used. After FSP, the hardness of the MMC fabricated from a 90 wt% Al2O3 powder blend increased to a maximum of 140 HV. SEM micrographs showed that the as-sprayed MMC coatings contained Al2O3 particles that had been trapped between the larger Al particles. FSP succeeded in redistributing the Al2O3 particles, decreasing the mean free interparticle distance and increasing the probability of load sharing between the reinforcing particles. It was suggested that this redistribution may be the primary reason for hardness improvement in the MMC coatings.
Subfields: Aerospace Engineering, Mechanical Engineering
View Paper: https://www.semanticscholar.org/paper/adab00f80b6044ecb8d53c90e8e5b3fdbb32adb6
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Citations in the corpus
- Welding processes for wear resistant overlays (2014, background): “SEM micrograph of cold-sprayed coating fabricated from Al–90 wt% Al2O3 powder blend after FSP at (a) 894 rpm and (b) 1723 rpm [125].”
- Friction stir processing of Al/SiC composites fabricated by powder metallurgy (2013, unknown): “In a recent work, Hodder et al. (2013) have used FSP on an Al/Al2O3 composite layer produced by cold gas dynamic spraying, in which the alumina particles were ved.”
- Issues and strategies in composite fabrication via friction stir processing: A review (2018, unknown): “[116] integrated cold spraying with FSP.”