Effect of aluminiumon ordering of highly stabilised β-Ti-V-Cr alloys

Li, Y. G.; Blenkinsop, P. A.; Loretto, M. H.; Walker, N. A.

doi:10.1179/026708398790300927

Cited by 6 publications

(1 citation statement)

References 4 publications

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“…The loop-like feature observed in the 77(TaMoTi)-8Cr-15Al sample are at a first glance similar to thermal anti-phase domain boundaries, which separate adjacent ordered domains. These are known from ordered compounds, like NiAl [46] and TiAl [47,35,48] and were recently reported in B2 RCCA [19,49]. In case of 77(TaMoTi)-8Cr-15Al, it seems like these planar faults exhibit a lower degree of order (as they appear darker than the matrix phase in the TEM-DF images) and Mo and Ta segregate to them, as shown in the EDS mappings in Fig.…”

Section: Preceding Ordering Followed By Phase Separationmentioning

confidence: 58%

Microstructure tailoring of Al-containing compositionally complex alloys by controlling the sequence of precipitation and ordering

et al. 2021

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Section: Preceding Ordering Followed By Phase Separationmentioning

confidence: 58%

Microstructure tailoring of Al-containing compositionally complex alloys by controlling the sequence of precipitation and ordering

et al. 2021

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Fatigue and fracture toughness of a Nb-Ti-Cr-Al-X single-phase alloy at ambient temperature

Davidson

Chan

Loloee

et al. 2000

Metall Mater Trans A

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The fatigue and fracture resistance of a commercially made, single-phase Nb-base alloy with 35 at. pct Ti, 5 at. pct Cr, 6 at. pct Al, and several elements to increase solid solution strengthening have been investigated. The threshold for fatigue crack growth was determined to be Ϸ7 MPaΊm and fracture toughness Ϸ35 MPaΊm. Crack growth was intermittent and sporadic; the fracture path was tortuous, crystallographic, and appeared to favor the {100} and {112} planes. Fatigue crack closure was measured directly at the crack tip. The fatigue and fracture properties of the commercial alloy are compared against those of Nb-Cr-Ti and Nb-Cr-Ti-Al alloys. The comparison indicated that Ti addition is beneficial for, but Al addition is detrimental to, both fracture toughness and fatigue crack resistance.

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The fatigue and fracture resistance of a Nb-Cr-Ti-Al alloy

Davidson

Chan

1999

Metall Mater Trans A

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The microstructure, fatigue, and fracture behaviors of a cast and heat-treated Nb-Cr-Ti-Al alloy were investigated. The microstructure of the cast alloy was manipulated by annealing at a temperature ranging from 500 ЊC to 1500 ЊC for 1 to 24 hours. The heat treatment produced Cr 2 Nb precipitates along grain boundaries in all cases except in the 500 ЊC heat-treated material. Fracture toughness tests indicated low fracture resistance in both the as-cast and heat-treated materials. Fatigue crack growth tests performed on the 500 ЊC heat-treated material also indicated a low fatigue crack growth resistance. Direct observations of the near-tip region revealed a cleavage-dominated fracture process, in accordance with fractographic evidence. The fracture behavior of the Nb-Cr-Ti-Al alloy was compared to that of other Nb-Cr-Ti alloys. In addition, theoretical calculations of both the unstable stacking energy (USE) and Peierls-Nabarro (P-N) barrier energy are used to elucidate the role of Al additions in cleavage fracture of the Nb-Cr-Ti-Al alloy. The results indicate that an Al alloying addition increases the USE, which, in turn, prevents the emission of dislocations, promotes the nucleation and propagation of cleavage cracks from the crack tip, and leads to a reduction in the fracture toughness.

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Effect of aluminiumon ordering of highly stabilised β-Ti-V-Cr alloys

Cited by 6 publications

References 4 publications

Microstructure tailoring of Al-containing compositionally complex alloys by controlling the sequence of precipitation and ordering

Microstructure tailoring of Al-containing compositionally complex alloys by controlling the sequence of precipitation and ordering

Fatigue and fracture toughness of a Nb-Ti-Cr-Al-X single-phase alloy at ambient temperature

The fatigue and fracture resistance of a Nb-Cr-Ti-Al alloy

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