Embrittlement of Ti-6Al-2Sn-4Zr-2Mo alloy by α2-phase precipitation

Mendiratta, M. G.; Chakrabarti, A.K.; Roberson, J. A.

doi:10.1007/bf02644166

Cited by 11 publications

(8 citation statements)

References 2 publications

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“…[152][153][154][155] Mendiratta et al [152] have reported the a 2 (Ti 3 Al) precipitation in Ti-6Al-2Sn-4Zr-2Mo during creep, and found that the a 2 (Ti 3 Al) particles are extremely small and, therefore, are likely to be sheared by the dislocations in the a matrix. [153] Li et al [154] investigated formation of the Ti 3 X (where X = Al, V, and Zr) phases in titanium alloy, and found that when the content of X in the alloy reaches a critical solution degree, the long-region ordered phase (Ti 3 X) with superlattice structure starts to occur in a-Ti.…”

Section: The A¢-martensite Transformation Within the Bandsmentioning

confidence: 99%

Shear Localization in Dynamic Deformation: Microstructural Evolution

Jing-hua

Bai

et al. 2008

Metall Mater Trans A

244

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Investigations made by the authors and collaborators into the microstructural aspects of adiabatic shear localization are critically reviewed. The materials analyzed are low-carbon steels, 304 stainless steel, monocrystalline Fe-Ni-Cr, Ti and its alloys, Al-Li alloys, Zircaloy, copper, and Al/SiC p composites. The principal findings are the following: (a) there is a strain-ratedependent critical strain for the development of shear bands; (b) deformed bands and whiteetching bands correspond to different stages of deformation; (c) different slip activities occur in different stages of band development; (d) grain refinement and amorphization occur in shear bands; (e) loss of stress-carrying capability is more closely associated with microdefects rather than with localization of strain; (f) both crystalline rotation and slip play important roles; and (g) band development and band structures are material dependent. Additionally, avenues for new research directions are suggested.

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Section: The A¢-martensite Transformation Within the Bandsmentioning

confidence: 99%

Shear Localization in Dynamic Deformation: Microstructural Evolution

Jing-hua

Bai

et al. 2008

Metall Mater Trans A

244

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“…Extending Shamblen's study on Ti-6Al-2Sn-4Zr-2Mo alloy, Mendiratta et al have reported [11] that the decomposition of a and precipitation of a 2 is accompanied by a loss of ductility at room temperature. Both K Ic and percent RA values showed significant reduction, whereas increase in strength and decrease in percent elongation were relatively insignificant [11]. It is seen in the case under study that it is the impact toughness, which has suffered the most.…”

Section: Discussionmentioning

confidence: 94%

“…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: 98%

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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“…[1][2][3][4] The previous two problems can be solved by the application of oxidation-resistant coatings on the surface of the titanium alloy. [5][6][7][8][9] These coated titanium alloys, however, can not yet work above 600°C for a reasonably long time because of the loss of plasticity due to the precipitation of undesired thermal products such as Ti 3 X or silicides.…”

Section: Introductionmentioning

confidence: 99%

“…[5][6][7][8][9] These coated titanium alloys, however, can not yet work above 600°C for a reasonably long time because of the loss of plasticity due to the precipitation of undesired thermal products such as Ti 3 X or silicides. [1][2][3] Also, the high-temperature fatigue failure is still limiting the further wide application of the titanium alloy. [10][11][12] To promote its maximum longterm service temperature, a titanium alloy should be protected not only by the oxidation-resistant coating, but also by the thermal insulation coating.…”

Section: Introductionmentioning

confidence: 99%

Thermal failure of thermal barrier coating with thermal sprayed bond coating on titanium alloy

Zhou

et al. 2008

J Coat Technol Res

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A thermal spray technology high-velocity oxygen fuel (HVOF) was used to deposit NiCoCrAlY as a bond coating between the titanium alloy substrate and top 8 wt% yttria-stabilized zirconia thermal-barrier coating (TBC) deposited by electron beam-physical vapor deposition (EB-PVD). The thermal cycling and isothermal exposure tests were conducted to evaluate the durability of the TBC. Investigations using OM, SEM, EPMA, and XRD revealed that the thermalsprayed BC makes the TBC more durable in isothermal exposure tests but more short-lived in thermal cycling tests, in comparison to our previous study in which the BC was prepared by EB-PVD. This is because the thermal-sprayed imperfections, such as microcracks and voids, elevate the diffusion resistance and degrade the mechanical properties of the BC, simultaneously. To current TBC systems in which the BC is deposited by HVOF, thermal failure behaviors-such as the formation of the Ti/Al mixture oxides at some individual places in the BC, and the Ti 2 Ni gaps formed around the BC/substrate interface-were also discussed.

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Embrittlement of Ti-6Al-2Sn-4Zr-2Mo alloy by α2-phase precipitation

Cited by 11 publications

References 2 publications

Shear Localization in Dynamic Deformation: Microstructural Evolution

Shear Localization in Dynamic Deformation: Microstructural Evolution

Embrittlement of the titanium alloy VT-5

Thermal failure of thermal barrier coating with thermal sprayed bond coating on titanium alloy

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