A comparative analysis of low temperature deformation in B2 aluminides

Pollock, Tresa M.; Lu, Damin; Xiao-li, Shi; Eow, K.

doi:10.1016/s0921-5093(01)01163-7

Cited by 42 publications

(27 citation statements)

References 32 publications

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“…/s, consistent with prior observations for NiAl [9,10,45]. Following this, a polycrystal RuAl sample of the same dimensions was tested in the same apparatus.…”

Section: Preliminary Creep Experimentssupporting

confidence: 73%

“…Additionally, strain rate change experiments were conducted to measure rate sensitivity. Rate sensitivities in binary RuAl (as well as a large number of ternary RuAl-based compositions) were very low compared to NiAl and similar to those observed for FeAl [9], even at low temperatures, where dislocation mobility is often limited for intermetallics. These low rate sensitivities suggest relatively high activation volumes for deformation and are an indication that the RuAl system is likely to possess good intrinsic deformability over a range of composition [9,10].…”

Section: Slip Systems In Rual -Low Temperaturessupporting

confidence: 56%

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Ruthenium Aluminides: Deformation Mechanisms and Substructure Development

Pollock¹

2005

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“…/s, consistent with prior observations for NiAl [9,10,45]. Following this, a polycrystal RuAl sample of the same dimensions was tested in the same apparatus.…”

Section: Preliminary Creep Experimentssupporting

confidence: 73%

Section: Slip Systems In Rual -Low Temperaturessupporting

confidence: 56%

Ruthenium Aluminides: Deformation Mechanisms and Substructure Development

Pollock¹

2005

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“…At the same time, dislocation mobility is also limited in many high temperature B2 intermetallics [6]. Brittleness arises due to lack of dislocation mobility and/or insufficient number of independent slip systems to satisfy the Von Mises criterion [7].…”

Section: Intermetallic Aluminides and Selection Of Materials Systemmentioning

confidence: 99%

“…It exhibits both unusually high room temperature "chisel toughness" [8] and diverse deformation characteristics [6,[9][10][11][12][13]. From an applications point of view, this B2 intermetallic is of interest as a bond coat material for thermal barrier coating systems that are utilized to extend the temperature capabilities of nickel-base single crystal superalloys.…”

Section: Intermetallic Aluminides and Selection Of Materials Systemmentioning

confidence: 99%

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Local Strain Development and Property Variability in B2 Intermetallics

Pollock¹,

Graef²

2005

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The public reporting burden for this collection of information is estimated to average 1 hour per response, including the tin" and maintaining the data needed, and completing end reviewing the collection of information. Send comments regarding I tiec including suggestions for reducing the burden, to Department of Defense, Washington Headquarters Services, Directorati ) SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES) 10. SPONSOR/MONITOR'S ACRONYM(S)USAF/AFRL AFOSR AFOSR 875 North Randolph Street SPONSOR/MONITOR'S REPORTArlington VA 22203 NUMBER(S)12. DISTRIBUTION/AVAILABILITY STATEMENT Distribution Statement A. Approved for public release; distribution is unlimited. SUPPLEMENTARY NOTES ABSTRACTThe overall objective of this research program was to develop a quantitative understanding of the relationship of straining processes at the scale of microstructure to macroscopic mechanical properties of structural materials. To accomplish this, experimental high-resolution displacement mapping techniques for analysis of strains at the micron scale were developed and validated. Strain accumulation and its relationship to microstruGtural features in several variants of the B2 intermetallic RuAl were investigated. Significant heterogeneity of straining was observed within individual grains and among neighboring grains in all materials studied. The scale of strain heterogeneity was influenced by grain size and the presence of second phases along grai boundaries. Grain to grain strain distributions developed early in the straining process and strain maps revealed self-similar straining patterns during progressive loading. The relationship between grain-scale strains and deformation mechanisms was studied via dislocation substructure analysis with "targeted" removal of TEM foils with a focused ion beam system. The strain mapping tool proved useful for the identification of active slip systems in the intennetallic RuAl system. Finally. high resolution

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Strength of Disordered and Ordered Al‐Containing Refractory High‐Entropy Alloys

Laube,

Winkens,

Kauffmann

et al. 2024

Adv Eng Mater

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Body‐centered cubic refractory high entropy alloys (RHEA) are promising for high‐temperature structural application due to their exceptional properties, particularly in terms of yield strength at elevated temperatures. For certain alloy systems, such as Mo‐Ti‐Cr‐Al, both disordered (A2) and ordered (B2) crystal structures are possible. In this particular system, a solid‐state transformation from A2 to B2 during cooling occurs. For Al concentrations above approximately 10 at.%, B2 order is obtained from the transformation temperature down to room temperature, while A2 is stable above room temperature below the critical Al content. In this study, two alloys from the Mo‐Ti‐Cr‐Al system close to the transition between A2 and B2 were investigated. Nanoindentation tests revealed that the magnitude of strain rate sensitivity for both alloys is small compared to classical alloys, however, significantly temperature dependent up to the strength plateau temperatures. The yield strength plateau, which is insensitive to the strain rate, was observed at temperatures exceeding 573 K. Modelling of solid solution strengthening reproduces the experimental data in the Al‐lean A2 alloys. However, the observed discontinuous increase of strength in the Al‐rich B2 alloys can only be rationalized by the appearance of B2 order and to no significant other obvious strengthening mechanisms.This article is protected by copyright. All rights reserved.

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A comparative analysis of low temperature deformation in B2 aluminides

Cited by 42 publications

References 32 publications

Ruthenium Aluminides: Deformation Mechanisms and Substructure Development

Ruthenium Aluminides: Deformation Mechanisms and Substructure Development

Local Strain Development and Property Variability in B2 Intermetallics

Strength of Disordered and Ordered Al‐Containing Refractory High‐Entropy Alloys

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