In situ neutron diffraction analysis of stress-free d-spacing during solution heat treatment of modified 319 Al alloy engine blocks

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DOIResolve DOI: http://doi.org/10.1179/1879139514Y.0000000161
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TypeArticle
Journal titleCanadian Metallurgical Quarterly
ISSN0008-4433
Volume54
Issue1
Pages3037; # of pages: 8
SubjectAluminum; Aluminum alloys; Dissolution; Engine cylinders; Engines; Fuels; Heat treatment; Neutron diffraction; Neutrons; Thermal expansion; Engine blocks; Heat treatment parameters; Heat treatment process; In-situ neutron diffraction; Processing history; Solution heat treatment; Vehicle fuel efficiencies; In situ processing
AbstractAluminium alloy engine blocks have successfully replaced ferrous materials in order to maximise weight savings and improve vehicle fuel efficiency. However, the development of an optimal heat treatment process is required to improve engine block casting integrity and prevent potential problems such as in-service cylinder distortion. Optimisation of heat treatment parameters requires an in-depth study to determine how residual stresses are relieved with time during solution heat treatment. In order to perform this analysis, however, in situ neutron diffraction must first be carried out on stress-free samples of the same composition and processing history as the engine blocks to account for factors such as thermal expansion and changes in lattice parameter due to dissolution of secondary phases. The results from this study suggest that thermal expansion caused the largest change in d0 spacing, while prolonged exposure at the solutionising temperature resulted in relatively small changes in {311} and {331} d0 spacing due to phase dissolution.
Publication date
PublisherManey
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); Security and Disruptive Technologies
Peer reviewedYes
NPARC number21275662
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Record identifier93509020-90cd-4c2e-bee9-755d71efa6db
Record created2015-07-14
Record modified2016-05-09
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