Precipitation of ordered α2 phase in Ti–6–22–22 alloy

Zhang, X.D; Wiezorek, J.M.K.; Baeslack, W.A.; Evans, Daniel J.; Fraser, Hamish L.

doi:10.1016/s1359-6454(98)00158-x

Cited by 38 publications

(13 citation statements)

References 7 publications

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“…Through increasing the cooling rate the 2 precipitation would decrease and could be further suppressed with water quench. Such a result was similar to the situation in Ti-6-22-22 alloy as reported by Zhang et al [10] who pointed out that the 2 precipitation behavior is sensitive to the applied cooling rate. The effect of aging temperature on the 2 precipitation, including both the amount and morphology, has been investigated for this new alloy.…”

Section: Microstructure Characterizationsupporting

confidence: 90%

“…The low strain energy during the precipitation could account for the preferred growth of 2 precipitates. As pointed out by Zhang et al [10], a lattice misfit normal to the basal plane of the matrix and the precipitates was negligible, but the misfit in the direction of [1 00] has been determined to be about 1.5%. …”

Section: Microstructure Characterizationmentioning

confidence: 94%

“…It has been reported that the presence of the intermetallic 2 precipitates in the parent matrix of + titanium alloys can lead to the formation of intensive slip bands during deformation and result in a significant loss of ductility and fracture toughness [5,9,10,13,15]. Although the 2 precipitates in the present alloy were very fine, they still had obvious detrimental effect on ductility and toughness, which was different from the result on Ti-6-22-22 alloy [10]. Secondly, the strength and toughness of + titanium alloys can also be affected by the secondary phase morphology [6,16].…”

Section: Mechanical Testingmentioning

confidence: 99%

“…The fracture toughness decreases with increase in strength level. The factors affecting the above two properties of titanium alloys mainly include the content of interstitial element, the morphology of phase, volume fraction of aged [8], and the 2 precipitates in the parent matrix [5,[9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

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Microstructure, Processing and Properties of A New Two‐Phase Titanium Alloy

Lei

Qiu

et al. 2016

Proceedings of the 13th World Conference on Titanium

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In many applications alloys with higher strength than Ti-6Al-4V ELI and a similar level of fracture toughness and similar fatigue crack growth behavior are desirable. To achieve an excellent combination of high strength and good fracture toughness, a new two-phase titanium alloy based on Ti-Al-Mo-Cr-Sn-X was developed. The precipitation of 2 phase after various heattreatment was investigated, and its influence on the strength and toughness was discussed. Basketweave and equiaxed microstructures were respectively obtained after and / processing, and the mechanical properties of the two kinds of microstructures were compared. The basketweave microstructure of the designed alloy exhibits a remarkable combination of tensile strength and fracture toughness and fatigue crack growth rate similar to Ti-6Al-4V ELI. The designed alloy with good damage tolerance is an attractive material for aviation structural application.

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Section: Microstructure Characterizationsupporting

confidence: 90%

Section: Microstructure Characterizationmentioning

confidence: 94%

Section: Mechanical Testingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Microstructure, Processing and Properties of A New Two‐Phase Titanium Alloy

Lei

Qiu

et al. 2016

Proceedings of the 13th World Conference on Titanium

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“…The high level of impact toughness and tensile ductility obtained after the second vacuum anneal is believed to be the result of a microstructure consisting of undecomposed a phase. As observed by Zhang et al [9], the a 2 precipitation is affected not only by aluminum and oxygen contents, but also by processing history and heat treatment.…”

Section: Discussionmentioning

confidence: 63%

Embrittlement of the titanium alloy VT-5

Rao¹,

Shenoy²

2006

Mat.-wiss. u. Werkstofftech.

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The binary titanium-5wt% aluminum alloy (VT-5) is a commonly used Russian grade of titanium. It has much higher strength compared to the well known commercially pure titanium grades; at the same time it exhibits reasonable toughness values. Hot rolled bars of this grade were to be manufactured and supplied conforming to OST I 90173-75 specification. Material was hot rolled to final size; as the hydrogen level was higher than the specified maximum, the bars were subjected to vacuum annealing. The vacuum annealed material did not meet the specification with reference to Charpy impact toughness. Repeat vacuum heat treatment was therefore carried out at a higher temperature; material was then found to be meeting all specification requirements. The paper brings out the details of failure, analysis carried out to identify the factors responsible for the failure and the rejuvenation steps taken to render the product acceptable.Keywords

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