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

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)...

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Bibliographic Details
Published in:Journal of magnesium and alloys 2017-06, Vol.5 (2), p.225-230
Main Authors: Chelliah, Nagaraj M., Sudarshan, Kraemer, Lisa, Singh, Harpreet, Surappa, M.K., Raj, Rishi
Format: Article
Language:English
Subjects:
Dispersion strengthened alloys
High temperature
Light-weight materials
Magnesium
Polymer derived ceramics
Stress-rupture
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Summary: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.
ISSN:2213-9567
2213-9567
DOI:10.1016/j.jma.2017.04.002