Effect of long term aging on the microstructural stability and mechanical properties of Ti–6Al–2Cr–2Mo–2Sn–2Zr alloy

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

doi:10.1016/s0921-5093(02)00448-3

Cited by 39 publications

(16 citation statements)

References 22 publications

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“…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].…”

Section: Mechanical Testingmentioning

confidence: 55%

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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: Mechanical Testingmentioning

confidence: 55%

“…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%

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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“…Precipitation of Ti 3 Al zones (a 2 ) in a phase has been a wellstudied subject [7][8][9][10][11][12][13][14][15][16]. Previous workers showed that this precipitation can lead to embrittlement of a-Ti [7][8][9][10][11]14,15] The relatively low level of aluminum and the absence of Zr and Sn in VT-5, on the face of it, is not expected to lead to embrittlement / a 2 precipitation.…”

Section: Discussionmentioning

confidence: 99%

“…Previous workers showed that this precipitation can lead to embrittlement of a-Ti [7][8][9][10][11]14,15] The relatively low level of aluminum and the absence of Zr and Sn in VT-5, on the face of it, is not expected to lead to embrittlement / a 2 precipitation. However the exact position of the a / a +a 2 boundary has been a matter of controversy.…”

Section: Discussionmentioning

confidence: 99%

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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“…Some Ti alloys after TRIPLEX heat treatment have a good combination of properties such as tensile, fracture toughness and fatigue crack growth resistance. 7,13,14) Moreover, tensile properties and thermal stability of in situ synthesized Ti matrix composites after TRIPLEX heat treatment are better than those after heat treatment. 15) So, it is necessary to investigate fracture toughness of in situ synthesized Ti matrix composite after TRIPLEX heat treatment.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Heat Treatment on Microstructure and Fracture Toughness of In Situ Synthesized (TiB+La2O3)/Ti Composite

Wang

Qin

et al. 2011

Mater. Trans.

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The effects of and TRIPLEX heat treatment on the microstructure, tensile properties and fracture toughness of in situ synthesized (TiB+La 2 O 3 )/Ti composite were studied. TRIPLEX heat treatment was beta solution plus alpha-beta annealing plus aging. The microstructure of materials after and TRIPLEX heat treatment was widmanstätten. Compared with heat treatment, the length of laminar after TRIPLEX heat treatment was longer, the þ colony width was thinner. The width of laminar after TRIPLEX heat treatment followed by oil quenching was coarser than that after water quenching. Compared with heat treatment, the ductility of specimens after TRIPLEX heat treatment (oil and water quenching) was improved significantly. The fracture toughness of composite treated by TRIPLEX heat treatment was better than those by heat treatment. The composites after TRIPLEX heat treatment (oil quenching), had the best tensile properties and fracture toughness.

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Effect of long term aging on the microstructural stability and mechanical properties of Ti–6Al–2Cr–2Mo–2Sn–2Zr alloy

Cited by 39 publications

References 22 publications

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

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

Embrittlement of the titanium alloy VT-5

The Effect of Heat Treatment on Microstructure and Fracture Toughness of <I>In Situ</I> Synthesized (TiB+La<SUB>2</SUB>O<SUB>3</SUB>)/Ti Composite

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