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Microstructure and Mechanical Properties of Fe-Ni-Mn-Al Alloys

Published online by Cambridge University Press:  26 February 2011

M. W. Wittmann ,
I. Baker  and
J. A. Hanna
M. W. Wittmann
Affiliation:
Thayer School of Engineering, Dartmouth College, Hanover, NH 03755–8000, USA, P. R. Munroe, Electron Microscope Unit, University of New South Wales, Sydney, NSW 2052, Australia
I. Baker
Affiliation:
Thayer School of Engineering, Dartmouth College, Hanover, NH 03755–8000, USA, P. R. Munroe, Electron Microscope Unit, University of New South Wales, Sydney, NSW 2052, Australia
J. A. Hanna
Affiliation:
Thayer School of Engineering, Dartmouth College, Hanover, NH 03755–8000, USA, P. R. Munroe, Electron Microscope Unit, University of New South Wales, Sydney, NSW 2052, Australia
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Abstract

In an attempt to produce a two-phase alloy consisting of a L21–structured (Fe, Ni)2MnAl-based phase in either a B2 or b.c.c. matrix, seven Fe-Ni-Mn-Al alloys were cast. Transmission electron microscopy (TEM) of the as-cast alloys revealed a range of microstructures including single phase L21, a f.c.c./B2 eutectic, and alternating, coherent 10–60 nm wide ordered and disordered b.c.c. rods aligned along <100>. A description of the phases, including chemical compositions and hardnesses is presented.

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