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Determining the Mechanical Strength of Ultra-Fine-Grained Metals

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Dislocations in nanostructured two-phase Fe30Ni20Mn20Al30.

X Wu¹, I Baker

¹Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire 03755-8000, USA.

Microscopy Research and Technique

|January 22, 2013

Summary

Dislocations in Fe-Ni-Mn-Al alloys exhibit different slip behaviors. At high temperatures, slip occurs via a<100> dislocations in the B2 phase, contrasting previous findings at room temperature.

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Area of Science:

Materials Science
Metallurgy
Solid Mechanics

Background:

Previous research identified a/2<111> Burgers vectors for dislocations in Fe30Ni20Mn25Al25 at room temperature.
Dislocations in the previous study glided in pairs on {110} and {112} planes, uncoupled in the b.c.c. phase and connected by an anti-phase boundary in the B2 phase.

Purpose of the Study:

To analyze dislocation behavior in the B2 phases of a related two-phase alloy, Fe30Ni20Mn20Al30, at elevated temperatures.
To investigate the slip vector of dislocations in Fe-Ni-Mn-Al alloys under specific high-temperature deformation conditions.

Main Methods:

Compression testing of Fe30Ni20Mn20Al30 alloy at 873 K with a strain rate of 5 × 10⁻⁴ s⁻¹.
Analysis of dislocation structures and slip vectors within the B2 phases of the alloy post-deformation.

Main Results:

Slip in the ~5 nm-wide B2 phases of Fe30Ni20Mn20Al30 occurs via the glide of a<100> dislocations.
Observed slip vector differs from the a/2<111> Burgers vectors reported for room temperature deformation in a similar alloy.

Conclusions:

The study demonstrates a shift in dislocation glide mechanism to a<100> dislocations in the B2 phase at 873 K.
Differences in composition and/or deformation temperature are suggested as potential reasons for the observed variation in slip vectors between different B2 phases and deformation conditions.