Chelliah, Nagaraj M and Singh, Harpreet and Surappa, MK (2017) Microstructural evolution and strengthening behavior in in-situ magnesium matrix composites fabricated by solidification processing. In: Materials Chemistry and Physics, 194 . pp. 65-76. ISSN 02540584
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Abstract
In-situ magnesium matrix composites with three different matrix materials (including Mg, AZ91 and AE44 Mg-alloys) were fabricated by injecting cross-linked polymer directly into the molten Mg/Mg-alloys, and having it convert to the 2.5 vol% SiCNO ceramic phase using liquid stir-casting method. In-situ chemical reaction took place within the molten slurry tending to produce 42 and 18 vol% Mg2Si crystals in Mg and AE44 matrix composites, respectively but not in AZ91 matrix composite. Microstructural evolution of Mg2Si crystals was discussed on the basis of availability of heterogeneous nucleation sites and amount of Al-atoms in the molten slurry. The observed micro-hardness and yield strengths are enhanced by factor of four to three as compared to their unreinforced counterparts, and Taylor strengthening was found to be the predominant strengthening mechanism in magnesium and AE44 matrix composites. Summation model predicted the yield strengths of the fabricated composites more preciously when compared to Zhang and Chen, and modified Clyne models.
| Item Type: | Journal Article |
|---|---|
| Publication: | Materials Chemistry and Physics |
| Publisher: | Elsevier Ltd |
| Additional Information: | The copyright for this article belongs to the Authors. |
| Keywords: | In-situ processing; Metal matrix composites (MMCs); Microstructural evolution; Polymer derived ceramics; Strengthening mechanisms |
| Department/Centre: | Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy) |
| Date Deposited: | 01 Jun 2022 04:55 |
| Last Modified: | 01 Jun 2022 04:55 |
| URI: | https://eprints.iisc.ac.in/id/eprint/72863 |
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