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Effect of calcium addition on the microstructure evolution, work hardening rate and wear resistance of the magnesium-calcium binary alloy at room temperature

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Abstract

At room temperature, the mechanical properties and microstructural evolution of magnesium-calcium alloys (Mg-Ca) were investigated. Magnesium with calcium 0.3, 0.9, 1.5, 2.1, and 2.7 wt.% alloys were cast in an SF6 inert atmosphere. When the amount of calcium in the alloy changes from 0.3 to 2.7 wt.%, the grain size of the alloy was refined from 716 to 47 micrometres. Hardness (23-47 HV) was found to increase with an increase in Ca addition up to 1.5 wt.%. The work-hardening behaviour of Mg-Ca alloys deformed in tension was analysed and using Considere’s criteria, the absence of necking phenomena was found for all five alloys. Analysis of wear tests showed that the average COF values for Mg-0.3Ca (0.554) and Mg-2.7Ca (0.644) were higher than it was for other compositions with a similar average COF (∼0.3) value. Microstructural properties, such as grain size, volume fractions of Mg2Ca precipitates, and change in grain morphology (equiaxed into dendrites), were correlated to mechanical performance and wear rate variation to determine the optimal alloy composition.

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Babu, S., Gangolu, S. & Joseph, M.A. Effect of calcium addition on the microstructure evolution, work hardening rate and wear resistance of the magnesium-calcium binary alloy at room temperature. Sādhanā 48, 20 (2023). https://doi.org/10.1007/s12046-023-02082-7

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  • DOI: https://doi.org/10.1007/s12046-023-02082-7

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