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

Journal article


Kumar D, Goel, S., Gosvami N and Jain J (2020). Towards an improved understanding of plasticity, friction and wear mechanisms in precipitate containing AZ91 Mg alloy. Materialia. 10, p. 100640.
AuthorsKumar D, Goel, S., Gosvami N and Jain J
Abstract

This 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> and 1/3 <12 ̅10> 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.

KeywordsMg alloys; precipitates; nano-wear; dislocation; twinning; atomistic simulations
Year2020
JournalMaterialia
Journal citation10, p. 100640
PublisherElsevier
Digital Object Identifier (DOI)doi:10.1016/j.mtla.2020.100640
Web address (URL)https://www.journals.elsevier.com/materialia
Publication dates
Print28 Feb 2020
Publication process dates
Accepted25 Feb 2020
Deposited28 Feb 2020
Accepted author manuscript
License
CC BY-NC-ND 4.0
File Access Level
Open
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