Microplasticity and fracture in a Ti-15V-3Cr-3Al-3Sn alloy

Rabeeh, Bakr Mohamed; Rokhlin, S. I.; Soboyejo, W. O.

doi:10.1016/s1359-6462(96)00328-4

Cited by 17 publications

(9 citation statements)

References 4 publications

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“…It was reported that grain boundary sliding at room temperature has been observed in titanium alloys. 14,15) In the present study, the existence of relatively soft films at grain boundaries relative to þ structures in the grain interior facilitated grain boundary sliding during notched tensile tests. EDS analysis confirmed that the grain boundary sliding regions were rich in Al and poor in V, Fe, and Mo, i.e.…”

Section: Resultsmentioning

confidence: 58%

Influence of Microstructures on the Notched Tensile Strength of Ti-4.5Al-3V-2Fe-2Mo Alloy

et al. 2008

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The notched tensile strength (NTS) of Ti-4.5Al-3V-2Fe-2Mo specimens with distinct heat treatment conditions was investigated and correlated to microstructures. The specimens were solution-treated at either 980 or 870 C (above or below the -transus) and then waterquenched prior to aging treatments. After aging at 482, 593, and 704 C, titanium martensite ( 0 or 00 ) decomposed into and with distinct sizes. Additionally, the specimens aged at 482 C were particularly susceptible to notch brittleness, regardless of the solution temperature. As the aging temperature increased, the lower hardness associated with coarsened þ structures resulted in decreased notch brittleness of the alloy. In general, the specimens containing primary in microstructure were prone to brittle fracture and reduced NTS. The alignment of martensite packets (or needles) with respect to the crack growth direction could affect the fracture appearance of the specimens, particularly for the coarsegrained specimens which were solution-treated at 980 C. Furthermore, the existence of grain boundary for the specimens aged at 593 C or higher promoted grain boundary sliding during notched tensile tests.

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Section: Resultsmentioning

confidence: 58%

Influence of Microstructures on the Notched Tensile Strength of Ti-4.5Al-3V-2Fe-2Mo Alloy

et al. 2008

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“…Fatigue striations and faceted observed in earlier studies on the metastable ␤ Ti-15V-3Cr-3Al-3Sn alloy. [25] The initially localized plasticity is distribfracture modes were observed on the fracture surfaces of the specimens that were tested at 750 ЊC at a ⌬K of ϳ20 uted randomly, presumably within favorably oriented grains. However, the localized microplasticity spreads gradually MPaΊm (Figure 12(a)).…”

Section: Fatigue-life Behaviormentioning

confidence: 99%

An investigation of the fatigue and fracture behavior of a Nb-12Al-44Ti-1.5Mo intermetallic alloy

Soboyejo

Dipasquale

et al. 1999

Metall Mater Trans A

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This article presents the results of a study of the fatigue and fracture behavior of a damage-tolerant Nb-12Al-44Ti-1.5Mo alloy. This partially ordered B2 ϩ orthorhombic intermetallic alloy is shown to have attractive combinations of room-temperature ductility (11 to 14 pct), fracture toughness (60 to 92 MPaΊm), and comparable fatigue crack growth resistance to IN718, Ti-6Al-4V, and pure Nb at room temperature. The studies show that tensile deformation in the Nb-12Al-44Ti-1.5Mo alloy involves localized plastic deformation (microplasticity via slip-band formation) which initiates at stress levels that are significantly below the uniaxial yield stress (ϳ9.6 pct of the 0.2 pct offset yield strength (YS)). The onset of bulk yielding is shown to correspond to the spread of microplasticity completely across the gage sections of the tensile specimen. Fatigue crack initiation is also postulated to occur by the accumulation of microplasticity (coarsening of slip bands). Subsequent fatigue crack growth then occurs by the "unzipping" of cracks along slip bands that form ahead of the dominant crack tip. The proposed mechanism of fatigue crack growth is analogous to the unzipping crack growth mechanism that was suggested originally by Neumann for crack growth in single-crystal copper. Slower near-threshold fatigue crack growth rates at 750 ЊC are attributed to the shielding effects of oxide-induced crack closure. The fatigue and fracture behavior are also compared to those of pure Nb and emerging high-temperature niobium-based intermetallics.

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“…It is well known that the glide of grain or phase boundaries becomes easier as the deformation temperature is increased [21][22][23]. Therefore, the accommodation deformations through the glide of grain or phase boundaries were developed observably, and the stress concentration, which resulted in crack nucleation, was relaxed duly in the boundaries.…”

Section: Deformation At 600 • Cmentioning

confidence: 99%

The effect of microstructure on tensile properties, deformation mechanisms and fracture models of TG6 high temperature titanium alloy

Wang

Guo

Wang

et al. 2011

Materials Science and Engineering: A

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Microplasticity and fracture in a Ti-15V-3Cr-3Al-3Sn alloy

Cited by 17 publications

References 4 publications

Influence of Microstructures on the Notched Tensile Strength of Ti-4.5Al-3V-2Fe-2Mo Alloy

Influence of Microstructures on the Notched Tensile Strength of Ti-4.5Al-3V-2Fe-2Mo Alloy

An investigation of the fatigue and fracture behavior of a Nb-12Al-44Ti-1.5Mo intermetallic alloy

The effect of microstructure on tensile properties, deformation mechanisms and fracture models of TG6 high temperature titanium alloy

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