Microstructural characterization and creep behavior of dispersion strengthened MRI230D magnesium alloy

Shukla, SS and Nasker, P and Dieringa, H and Kumar, S and Mondal, AK (2024) Microstructural characterization and creep behavior of dispersion strengthened MRI230D magnesium alloy. In: Materials Science and Engineering: A, 916 .

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Abstract

The microstructural changes following the dispersion of SiC nanoparticles (SiCnp) and its subsequent significance on the creep response of MRI230D alloy are examined. Nanocomposites (NCs) of MRI230D alloy are fabricated with a dispersion of 1.0SiCnp (NC1SiC) and 2.0SiCnp (NC2SiC) (wt.) using squeeze-casting. The primary Mg (α-Mg), lamellar C36 (Mg,Al)2Ca, as well as blocky Al8Mn5 phases, are observed in the MRI230D alloy and NCs. Additionally, SiC phase is detected in NCs. The additions of SiCnp refine the grains of the NCs. The fraction of C36 increases with an increase in SiCnp in MRI230D alloy. The alloy and NCs are exposed to impression creep tests under 450�500 MPa stress and 448�498 K temperature. The NCs exhibit better resistance to creep over MRI230D alloy, and NC2SiC is the most creep-resistant. The strengthening from the increased fraction of C36, along with Orowan strengthening from SiCnp dispersion in the α-Mg matrix, give rise to improved creep strength of the NCs than the alloy. The creep in MRI230D alloy and NCs progressed by dislocation-climb with pipe diffusion. © 2024 Elsevier B.V.

Item Type:	Journal Article
Publication:	Materials Science and Engineering: A
Publisher:	Elsevier Ltd
Additional Information:	The copyright for this article belongs to publishers.
Keywords:	Calcium alloys; Creep resistance; Creep testing; Magnesium castings; Metal nanoparticles; Squeeze casting, Creep behaviors; Creep response; Dislocation climb; Dispersion strengthened; Impression creep; Microstructural changes; Microstructural characterizations; Primary Mg; SiC nanoparticles; Squeeze-cast, Magnesium alloys
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	30 Oct 2024 04:27
Last Modified:	30 Oct 2024 04:27
URI:	http://eprints.iisc.ac.in/id/eprint/86591

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