Microstructural evolution in solution heat treatment of gas- atomised Al alloy (7075) powder for cold spray

Cold gas dynamic spray is being explored as a repair technique for high-value metallic components, given its potential to produce pore and oxide-free deposits of between several micrometers and several millimeters thick with good levels of adhesion and mechanical strength. However, feedstock powders...

Full description

Bibliographic Details
Main Authors:	Sabard, Alexandre, Lovelock, H.L. de Villiers, Hussain, Tanvir
Format:	Article
Language:	English
Published:	Springer 2017
Online Access:	http://eprints.nottingham.ac.uk/48169/ http://eprints.nottingham.ac.uk/48169/ http://eprints.nottingham.ac.uk/48169/ http://eprints.nottingham.ac.uk/48169/2/10.1007%252Fs11666-017-0662-2.pdf

id	nottingham-48169
recordtype	eprints
spelling	nottingham-481692018-07-02T09:16:55Z http://eprints.nottingham.ac.uk/48169/ Microstructural evolution in solution heat treatment of gas- atomised Al alloy (7075) powder for cold spray Sabard, Alexandre Lovelock, H.L. de Villiers Hussain, Tanvir Cold gas dynamic spray is being explored as a repair technique for high-value metallic components, given its potential to produce pore and oxide-free deposits of between several micrometers and several millimeters thick with good levels of adhesion and mechanical strength. However, feedstock powders for cold spray experience rapid solidification if manufactured by gas atomization and hence can exhibit non-equilibrium microstructures and localized segregation of alloying elements. Here, we used sealed quartz tube solution heat treatment of a precipitation hardenable 7075 aluminum alloy feedstock to yield a consistent and homogeneous powder phase composition and microstructure prior to cold spraying, aiming for a more controllable heat treatment response of the cold spray deposits. It was shown that the dendritic microstructure and solute segregation in the gas-atomized powders were altered, such that the heat-treated powder exhibits a homogeneous distribution of solute atoms. Micro-indentation testing revealed that the heat-treated powder exhibited a mean hardness decrease of nearly 25% compared to the as received powder. Deformation of the powder particles was enhanced by heat treatment, resulting in an improved coating with higher thickness (* 300 lm compared to * 40 um for untreated feedstock). Improved particle–substrate bonding was evidenced by formation of jets at the particle boundaries. Springer 2017-11-16 Article PeerReviewed application/pdf en cc_by http://eprints.nottingham.ac.uk/48169/2/10.1007%252Fs11666-017-0662-2.pdf Sabard, Alexandre and Lovelock, H.L. de Villiers and Hussain, Tanvir (2017) Microstructural evolution in solution heat treatment of gas- atomised Al alloy (7075) powder for cold spray. Journal of Thermal Spray Technology . pp. 1-14. ISSN 1544-1016 https://link.springer.com/article/10.1007%2Fs11666-017-0662-2 doi:10.1007/s11666-017-0662-2 doi:10.1007/s11666-017-0662-2
repository_type	Digital Repository
institution_category	Local University
institution	University of Nottingham Malaysia Campus
building	Nottingham Research Data Repository
collection	Online Access
language	English
description	Cold gas dynamic spray is being explored as a repair technique for high-value metallic components, given its potential to produce pore and oxide-free deposits of between several micrometers and several millimeters thick with good levels of adhesion and mechanical strength. However, feedstock powders for cold spray experience rapid solidification if manufactured by gas atomization and hence can exhibit non-equilibrium microstructures and localized segregation of alloying elements. Here, we used sealed quartz tube solution heat treatment of a precipitation hardenable 7075 aluminum alloy feedstock to yield a consistent and homogeneous powder phase composition and microstructure prior to cold spraying, aiming for a more controllable heat treatment response of the cold spray deposits. It was shown that the dendritic microstructure and solute segregation in the gas-atomized powders were altered, such that the heat-treated powder exhibits a homogeneous distribution of solute atoms. Micro-indentation testing revealed that the heat-treated powder exhibited a mean hardness decrease of nearly 25% compared to the as received powder. Deformation of the powder particles was enhanced by heat treatment, resulting in an improved coating with higher thickness (* 300 lm compared to * 40 um for untreated feedstock). Improved particle–substrate bonding was evidenced by formation of jets at the particle boundaries.
format	Article
author	Sabard, Alexandre Lovelock, H.L. de Villiers Hussain, Tanvir
spellingShingle	Sabard, Alexandre Lovelock, H.L. de Villiers Hussain, Tanvir Microstructural evolution in solution heat treatment of gas- atomised Al alloy (7075) powder for cold spray
author_facet	Sabard, Alexandre Lovelock, H.L. de Villiers Hussain, Tanvir
author_sort	Sabard, Alexandre
title	Microstructural evolution in solution heat treatment of gas- atomised Al alloy (7075) powder for cold spray
title_short	Microstructural evolution in solution heat treatment of gas- atomised Al alloy (7075) powder for cold spray
title_full	Microstructural evolution in solution heat treatment of gas- atomised Al alloy (7075) powder for cold spray
title_fullStr	Microstructural evolution in solution heat treatment of gas- atomised Al alloy (7075) powder for cold spray
title_full_unstemmed	Microstructural evolution in solution heat treatment of gas- atomised Al alloy (7075) powder for cold spray
title_sort	microstructural evolution in solution heat treatment of gas- atomised al alloy (7075) powder for cold spray
publisher	Springer
publishDate	2017
url	http://eprints.nottingham.ac.uk/48169/ http://eprints.nottingham.ac.uk/48169/ http://eprints.nottingham.ac.uk/48169/ http://eprints.nottingham.ac.uk/48169/2/10.1007%252Fs11666-017-0662-2.pdf
first_indexed	2018-09-06T13:57:55Z
last_indexed	2018-09-06T13:57:55Z
_version_	1610866780560949248

Microstructural evolution in solution heat treatment of gas- atomised Al alloy (7075) powder for cold spray

Similar Items