Selection of α variants during microstructural evolution in<b><i>α/β</i></b>titanium alloys

Lee, Eunha; Banerjee, Rajarshi; Kar, Sujoy Kumar; Bhattacharyya, Dhriti; Fraser, Hamish L.

doi:10.1080/14786430701373672

Cited by 88 publications

(30 citation statements)

References 12 publications

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“…1d. All the variants appear as either long or short laths, which are similar to those observed in experiments [12,20,49,50].…”

Section: An Infinite Straight Edge Dislocationsupporting

confidence: 75%

“…4e and h). These clusters have also been observed frequently in experiments [20,22,52]. Interestingly, the tent structure obtained is similar in terms of morphology to that observed during a diffusionless phase transformation when martensite bulged out on the sample surface [53].…”

Section: Effects Of Interaction Among Different a Variants On Variantsupporting

confidence: 51%

“…This suggests that the elastic interaction energy may not be the only parameter that controls the operating mechanisms underlying variant selection. As a matter of fact, during a phase transformation the local stress state keeps evolving as the microstructure evolves, and so does the variant selection process via so-called self-accommodation [20,21] and autocatalysis [22]. For instance, the average transformation-induced shape strains of diverse a clusters have been calculated by Wang et al [21] and the results indicate that the most frequently observed a clusters are formed by simultaneous nucleation of three or four variants that self-accommodate with each other to achieve the smallest shape strain components, especially for the shear components.…”

Section: Introductionmentioning

confidence: 99%

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Variant selection by dislocations during α precipitation in α/β titanium alloys

et al. 2015

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“…1d. All the variants appear as either long or short laths, which are similar to those observed in experiments [12,20,49,50].…”

Section: An Infinite Straight Edge Dislocationsupporting

confidence: 75%

Section: Effects Of Interaction Among Different a Variants On Variantsupporting

confidence: 51%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Variant selection by dislocations during α precipitation in α/β titanium alloys

et al. 2015

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“…Grain boundary can have significant effect on mechanical behaviour, especially toughness and ductility [1]. Consequently its formation has been extensively investigated [2][3][4][5][6][7][8]. These studies confirm that gb is usually related to one of the adjacent grains by the Burgers orientation relationship (BOR):…”

Section: Introductionmentioning

confidence: 67%

Grain Boundary α and β Grain Boundary Orientation in Titanium Alloys

Pilchak

Banerjee

Williams

2016

Proceedings of the 13th World Conference on Titanium

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The formation of grain boundary in titanium alloys has been extensively investigated in the past since its morphology, crystallography and distribution affect the mechanical behavior of titanium alloys. It is known that grain boundary forms with the Burgers orientation relationship to one the grains on either side of the grain boundary and therefore can form with 24 possible variants arising from this orientation relationship. The criteria for variant selection have been explored but lack of knowledge on the grain boundary plane in prior investigations has inhibited a complete understanding of the variant selection process. In this study we have developed a technique using EBSD and stereo pair imaging to relate crystallography to the prior grain boundary plane and reexamine the criteria for variant selection.

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“…Thus, limited defects are present at the interface, which is inferred to be a result of the atom rearrangement at the interface, reducing the interfacial energy, which is similar to the self-accommodation between α 2 variants [38]. The reported self-accommodation effects were observed in titanium alloys and the angle between (0001)α 2 planes was 60 • , which was caused by the Burgers orientation relationship during the disordered β to α transformation [38]. For TiAl alloys, the 71 • deviation is easy to understand in the massive transformation; however, detailed observation of the interface is scarce.…”

Section: Precipitation Behavior Of α2 Phase During Annealing At 1250 °Cmentioning

confidence: 99%

Microstructure Evolution of a Ti-45Al-8.5Nb-0.2W-0.2B-0.02Y Alloy during Massive Transformation and Subsequent Annealing

Song

Wang

Xue

et al. 2018

Metals

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It has been widely reported that the microstructure refinement of TiAl alloys can be achieved by massive transformation and subsequent annealing in α 2 + γ two phase field. To achieve this goal, several heat treatment parameters must be adjusted, including the heat treatment temperature around single α phase field, the annealing temperature, and the annealing time for the precipitation of α 2 phase. Thus, a systematic study is needed for each alloy with different compositions. In this study, the heat treatment parameters for grain refinement via massive transformation of a high Nb-containing TiAl are investigated. Precipitation of α 2 phase during annealing is observed by transmission electron microscopy. It is found that 30 min at single α phase field is appropriate for the massive transformation; a full, massively transformed microstructure cannot be obtained by oil or water quenching. A short annealing time can result in a refined microstructure, whereas the sizes of the precipitated α 2 phase increases with the increase of annealing time. The α 2 phase can form at the interface of twin boundaries of the γ phase, following the Blackburn orientation relationship with both sides. The Vickers hardness is measured for the annealed samples, which remains relatively stable for different annealing times.

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Selection of α variants during microstructural evolution inα/βtitanium alloys

Cited by 88 publications

References 12 publications

Variant selection by dislocations during α precipitation in α/β titanium alloys

Variant selection by dislocations during α precipitation in α/β titanium alloys

Grain Boundary α and β Grain Boundary Orientation in Titanium Alloys

Microstructure Evolution of a Ti-45Al-8.5Nb-0.2W-0.2B-0.02Y Alloy during Massive Transformation and Subsequent Annealing

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