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Microstructure and Mechanical Properties of an Extruded Fe30Ni20Mn25Al25 Alloy

Published online by Cambridge University Press:  26 February 2011

J. A. Loudis ,
T. C. Boyd ,
D. A. Coen  and
I. Baker
J. A. Loudis
Affiliation:
Loudis@Dartmouth.eduThayer School of Engineering at Dartmouth CollegeHanover NH 03755-8000, USAUnited States
T. C. Boyd
Affiliation:
Taniquea.Boyd@Dartmouth.edu, Thayer School of Engineering at Dartmouth College, Hanover, NH, 03755-8000, USA, United States
D. A. Coen
Affiliation:
David.Coen@Dartmouth.edu, Thayer School of Engineering at Dartmouth College, Hanover, NH, 03755-8000, USA, United States
I. Baker
Affiliation:
Ian.Baker@Dartmouth.edu, Thayer School of Engineering at Dartmouth College, Hanover, NH, 03755-8000, USA, United States
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Abstract

A spinodal alloy, Fe30Ni20Mn25Al25, was produced by casting followed by hot extrusion. The microstructure consisted of coherent, 20-30 nm wide rods of alternating body-centered cubic (b.c.c.) and ordered B2 phases aligned along <100>. The room temperature mechanical properties were determined under compression over a range of strain rates. The as-extruded yield strength, which was strain-rate dependent, was ~1400 MPa. Annealing at 550°C led to the precipitation of large unit cell cubic phase and to an increase in hardness. Post-mortem TEM analysis of the compressed specimens identified dislocations having <111> Burgers vectors.

Keywords

strengthcrystallographic structuredislocations
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 980: Symposium II – Advanced Intermetallic-Based Alloys , 2006 , 0980-II01-02
Copyright
Copyright © Materials Research Society 2007

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