Slip System Modification in NiAl

Miracle, Daniel B.; Russell, Scott M.; Law, C. C.

doi:10.1557/proc-133-225

Cited by 14 publications

(4 citation statements)

References 5 publications

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“…In the study of the modification of slip behavior of NiAl single crystals, Miracle et al [4] and Field et al [5] discovered the precipitation of α-Cr particles. Yang et al [6] investigated the α-Cr precipitation in the four-phase field of NiAl-Ti-Cr system to modify the microstructure of multi-phase ordered alloys.…”

Section: Introductionmentioning

confidence: 99%

RETRACTED ARTICLE: The behavior of α-Cr precipitation on the high temperature deformation of B2-ordered NiAl

2009

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Transmission electron microscope investigation has been performed concerning the effect of Cr-precipitation on the mechanical properties of B2-ordered NiAl containing 4 mol.% to 8 mol.% of Cr. By aging at temperatures around 973 K after solution annealing, fine spherical precipitates appeared homogeneously in the NiAl matrix and the alloys hardened appreciably. The selected area electron diffraction patterns have not revealed any additional extra-spots during aging, because the Cr-particles have a cube-cube orientation relationship and keep perfect coherency with the ordered matrix lattice. Dislocations bypass the particles during deformation. Although the dispersion of Cr-particles increases the yield strength of NiAl at intermediate temperature, the strength decreases appreciably at higher temperatures. Atom location by channeling enhanced microanalysis technique has been used to determine the site occupancy of Cr in NiAl.

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Section: Introductionmentioning

confidence: 99%

RETRACTED ARTICLE: The behavior of α-Cr precipitation on the high temperature deformation of B2-ordered NiAl

2009

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“…% Fe was replaced by Ni in FeAl (Patrick et al, ). Increasing temperature can also elicit a change from <111> slip to <100> slip in a number of B2 compounds (Baker and Gaydosh, ; Broom and Humble, ; Head et al, ; Kad and Horton, ; Mendiratta et al, ; Miracle et al, ; Mitchell et al, ; Munroe and Baker, ; Nohara and Imura, ; Nohara et al, ; Saka and Kawase, ; Saka et al, ; Umakoshi and Yamaguchi, ; Yoshimi et al, ). Thus, the difference in slip vector between the B2 phases in different FeNiMnAl alloys oberved here and earlier (Loudis and Baker, ) could be due to either differences in the composition of the phases or, possibly, due to the difference in the deformation temperature, a feature for future study.…”

Section: Resultsmentioning

confidence: 99%

Dislocations in nanostructured two‐phase Fe₃₀Ni₂₀Mn₂₀Al₃₀

Baker

2013

Microscopy Res & Technique

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In a previous study, the dislocations in Fe(30)Ni(20)Mn(25)Al(25) (at. %), which consist of 50 nm wide alternating b.c.c. and B2 phases, were shown to have a/2<111> Burgers vectors after room temperature deformation. The dislocations were found to glide in pairs on both {110} and {112} slip planes and were relatively widely separated in the b.c.c. phase, where the dislocations were uncoupled, and closely spaced in the B2 phase, where the dislocations were connected by an anti-phase boundary. In this article, we analyze the dislocations in the two ~5 nm-wide B2 phases in a related two-phase alloy Fe(30)Ni(20)Mn(20)Al(30), with compositions Fe-23Ni-21Mn-24Al and Fe-39Ni-12Mn-34Al, compressed to ~3% strain at a strain rate 5 × 10(-4) s(-1) at 873 K (the lowest temperature at which substantial plastic flow was observed). It is shown that slip occursby the glide of a<100> dislocations. A review of the literature suggests that the differences in the observed slip vector between these B2 phases could be due to the differences in composition, differences in deformation temperature, or possibly both.

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“…These precipitates are typically non-shearable as their slip system 100 {010} does not allow for order hardening via e.g. pairs of bcc 1 2 111 {110}-type dislocations [8]. However, the inclusion of Ni and other alloying additions for precipitate formation further increase the expense of such alloys.…”

Section: Introductionmentioning

confidence: 99%