Towards an improved understanding of plasticity, friction and wear mechanisms in precipitate containing AZ91 Mg alloy

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dc.contributor.authorKumar, Deepak
dc.contributor.authorGoel, Saurav
dc.contributor.authorGosvami, Nitya Nand
dc.contributor.authorJain, Jayant
dc.date.accessioned2020-03-13T15:48:12Z
dc.date.available2020-03-13T15:48:12Z
dc.date.issued2020-02-28
dc.description.abstractThis work reports a combined experimental and atomistic simulation study on continuous precipitates (CPs) and discontinuous precipitates (DPs) affecting the scratch induced wear in AZ91 magnesium alloy. Nanoscratching experiments complemented by atomic simulations were performed to understand the directional dependence and origins of plasticity, friction and wear mechanisms as benchmarked to nanocrystalline HCP magnesium. Post scratch deformation analysis was performed using electron back scattering diffraction, scanning electron microscope and molecular dynamics (MD) simulation. The direction of orientation of the precipitates was observed to make a significant influence on the deformation behaviour. For example, regardless of the precipitates type (CP or DP), a ductile-brittle transition becomes pronounced while scratching along the direction (orientation) of precipitates, whilst a fully ductile response was obtained while scratching along the direction normal to the precipitates. However, regardless of the direction of orientation, DPs showed a higher wear resistance and coefficient of friction compared to the CPs. These observations were supported by the quantitative analysis of the planar defects such as coherent twins, extrinsic and intrinsic stacking faults in the deformation zone as well as 1/3〈11¯00〉" role="presentation"> ( and 1/3〈12¯10〉" role="presentation"> dislocations type extracted from the MD analysis.These observations will facilitate an improved design of AZ91 alloys in particular and intermetallic precipitate containing alloys in general.en_UK
dc.identifier.citationKumar D, Goel S, Gosvami NN, et al., (2020) Towards an improved understanding of plasticity, friction and wear mechanisms in precipitate containing AZ91 Mg alloy. Acta Materialia, Volume 10, May 2020, Article number 100640en_UK
dc.identifier.issn1359-6454
dc.identifier.urihttps://doi.org/10.1016/j.mtla.2020.100640
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/15282
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.subjectMg alloysen_UK
dc.subjectnano-wearen_UK
dc.subjectdislocationen_UK
dc.subjectatomistic simulationsen_UK
dc.subjecttwinningen_UK
dc.subjectprecipitatesen_UK
dc.titleTowards an improved understanding of plasticity, friction and wear mechanisms in precipitate containing AZ91 Mg alloyen_UK
dc.typeArticleen_UK

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