Microstructural correlation with tensile and creep properties of AZ91 alloy in three casting techniques

Shastri, H and Mondal, AK and Dutta, K and Dieringa, H and Kumar, S (2020) Microstructural correlation with tensile and creep properties of AZ91 alloy in three casting techniques. In: Journal of Manufacturing Processes, 57 . pp. 566-573.

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Abstract

The relationships among microstructure, tensile and creep behaviour of the AZ91 Mg alloy produced by three different casting techniques have been investigated. All the as-cast alloys consist of primary Mg (α-Mg) and β-Mg17Al12 phases. The volume fraction of β-Mg17Al12 phase is the highest in the gravity casting (GC), intermediate in the squeeze-casting (SC) and the lowest in the high-pressure die-casting (HPDC). The best tensile properties are exhibited by the SC alloy at all the temperatures employed in the present investigation owing to the presence of negligible porosity and relatively finer grain size. Fracture surfaces of the broken tensile specimens reveal the quasi-cleavage fracture. The best and the worst creep resistance are exhibited by the SC and HPDC alloys respectively with the GC alloy exhibiting the intermediate creep resistance. The inferior creep resistance of the HPDC alloy is attributed to the presence of a higher amount of porosity that allows easy crack initiation and growth during creep tests. On the contrary, the negligible porosity and continuous network of eutectic phase contributes to the superior creep resistance of the SC alloy. © 2020 The Society of Manufacturing Engineers

Item Type:	Journal Article
Publication:	Journal of Manufacturing Processes
Additional Information:	All the copyrights belongs to the publisher.
Keywords:	Creep; Magnesium alloys; Porosity; Squeeze casting; Tensile strength, Casting techniques; Creep properties; Fracture surfaces; High pressure die casting; Micro-structural; Quasi cleavage fracture; Superior creep resistance; Tensile specimens, Creep resistance
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	16 Dec 2024 12:25
Last Modified:	16 Dec 2024 12:25
URI:	http://eprints.iisc.ac.in/id/eprint/66087

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