High-temperature transformation pathways for metastable ferromagnetic binary Heusler (Al-55 at.%Mn) alloy

Palanisamy, Dhanalakshmi and Srivastava, Chandan and Madras, Giridhar and Chattopadhyay, Kamanio (2017) High-temperature transformation pathways for metastable ferromagnetic binary Heusler (Al-55 at.%Mn) alloy. In: JOURNAL OF MATERIALS SCIENCE, 52 (7). pp. 4109-4119.

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Abstract

The present manuscript probes the decomposition behaviour of the ferromagnetic binary metastable Heusler alloy in the Al-Mn system. The ferromagnetic ordered tetragonal phase (L1(0), popularly known as tau phase), which is metastable in nature, was synthesised from the melt through a copper mould chill casting process using 10-mm diameter mould. Isothermal and non-isothermal heat treatments were carried out to understand the decomposition sequence of tau phase at high temperatures. The metastable phase undergoes, on heating, a eutectoid-like decomposition of , where is the intermetallic phase Al8Mn5. Both the phases are present in the equilibrium diagram. The two phases at higher temperature further transform to a single phase epsilon having a hexagonal structure. We show through in situ X-ray diffraction studies that transforms to a disordered bcc phase () prior to the transformation to the epsilon-phase. The overall sequence of phase decomposition during heating can be given as . The high-temperature phase cannot be retained through quenching experiment and its existence can only be established by in situ studies.

Item Type:	Journal Article
Publication:	JOURNAL OF MATERIALS SCIENCE
Publisher:	SPRINGER, 233 SPRING ST, NEW YORK, NY 10013 USA
Additional Information:	Copy right for this article belongs to the SPRINGER, 233 SPRING ST, NEW YORK, NY 10013 USA
Department/Centre:	Division of Mechanical Sciences > Chemical Engineering Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	09 Mar 2017 04:21
Last Modified:	09 Mar 2017 04:21
URI:	http://eprints.iisc.ac.in/id/eprint/56321

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