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Stress–rupture measurements of cast magnesium strengthened by in-situ production of ceramic particles

Chelliah, Nagaraj M and Sudarshan, Sudarshan and Kraemer, Lisa and Singh, Harpreet and Surappa, MK and Raj, Rishi (2017) Stress–rupture measurements of cast magnesium strengthened by in-situ production of ceramic particles. In: Journal of Magnesium and Alloys, 5 (2). pp. 225-230. ISSN 22139567

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Official URL: https://doi.org/10.1016/j.jma.2017.04.002


We have introduced a polymer precursor into molten magnesium and then in-situ pyrolyzed to produce castings of metal matrix composites (P-MMCs) containing silicon-carbonitride (SiCNO) ceramic particles. Stress-rupture measurements of as-cast P-MMCs was performed at 350 °C (0.69TM) to 450 °C (0.78TM) under dead load condition corresponding to tensile stress of 2.5 MPa to 20 MPa. The time-to-fracture data were analyzed using the classical Monkman–Grant equation. The time-to-fracture is thermally activated and follows a power-law stress exponent exhibiting dislocation creep. Fractography analysis revealed that while pure magnesium appears to fracture by dislocation slip, the P-MMCs fail from the nucleation and growth of voids at the grain boundaries. © 2017

Item Type: Journal Article
Publication: Journal of Magnesium and Alloys
Publisher: National Engg. Reaserch Center for Magnesium Alloys
Additional Information: The copyright for this article belongs to the Authors.
Keywords: Dispersion strengthened alloys; High temperature; Light-weight materials; Magnesium; Polymer derived ceramics; Stress-rupture
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 31 May 2022 04:44
Last Modified: 31 May 2022 04:44
URI: https://eprints.iisc.ac.in/id/eprint/72851

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