Low-temperature superplasticity of titanium aluminides

Imayev, R. M.; Салищев, Г. А.; Senkov, O.N.; Imayev, V. M.; Шагиев, М.Р.; Gabdullin, N.K.; Кузнецов, А. В.; Froes, F. H.

doi:10.1016/s0921-5093(00)01813-x

Cited by 69 publications

(38 citation statements)

References 19 publications

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“…1) Several SPD techniques such as equal channel angular pressing (ECAP), [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] torsion under high pressure 1,3,21) and multi-directional forging (MDF) [22][23][24][25][26][27][28] are now available for attaining of the UFG structures in numerous metals and alloys. There are several reports to date dealt with the investigation of the fine-grained structure evolution in Al alloys at different temperatures during SPD.…”

Section: Introductionmentioning

confidence: 99%

Partial Grain Refinement in Al-3%Cu Alloy during ECAP at Elevated Temperatures

et al. 2009

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Microstructural changes during equal channel angular pressing (ECAP) in a temperature interval from 523 to 748 K ($0:6{0:8 T m ) were studied in a coarse-grained binary aluminum alloy Al-3%Cu. Hot ECAP results in grain refinement taking place at all temperatures investigated, leading to a non-uniform development of deformation-induced fine grains and the remnant original grains containing subgrains with low-angle boundaries. Fine-grained structure is developed along microshear bands formed in grain interiors as well as along initial grain boundaries. The number and the average misorientation angle of the boundaries of microshear bands start to increase at above a critical strain of about 2, finally leading to development of new fine-grained structures. The volume fraction and the average misorientation of deformation-induced boundaries are reduced with rising temperature. The thermal stability of the evolved deformation microstructures and several factors controlling grain refinement during hot ECAP are discussed in details.

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Section: Introductionmentioning

confidence: 99%

Partial Grain Refinement in Al-3%Cu Alloy during ECAP at Elevated Temperatures

et al. 2009

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“…1) Several techniques, e.g. equal channel angular extrusion, [1][2][3][4][5][6][7][8] torsion under high pressure, 1,4,7) multidirectional forging (MDF) 1,4,[9][10][11][12][13][14] etc., are available for subjecting materials to ultra-high strains required to develop such fine grain structures. MDF seems to be especially attractive in these various SPD methods, because it is the easiest method without any special device and has great potentiality for scaling up of relatively large samples that can be suitable for industrial applications.…”

Section: Introductionmentioning

confidence: 99%

Effect of Pass Strain on Grain Refinement in 7475 Al Alloy during Hot Multidirectional Forging

et al. 2004

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Effect of pass strain (Á") on grain refinement was studied in multidirectional forging (MDF) of a coarse-grained 7475 Al alloy at 490 C under a strain rate of 3 Â 10 À4 s À1 . Samples of rectangular shape were deformed up to accumulated strains of around 6 with subsequent changes in loading direction 90 from pass to pass. The pass strains in each compression (Á") were 0.4 and 0.7. The cumulative flow curves integrated by each compression exhibit significant work softening just after yielding, followed by apparent steady state plastic flow at high strains. Structural changes were characterized by grain fragmentation due to frequent development of deformation and/or microshear bands followed by full evolution of new fine grains in the original grains. Increasing Á" accelerates significantly the kinetics of grain refinement, leading to more clear reduction of flow stresses at moderate to high strains. MDF of Á" ¼ 0:7 results finally in formation of a finer grained structure with an average size of around 7.5 mm at strains of above 3.5, while, the processing with Á" ¼ 0:4 develops a slightly coarser grain structure at higher strain of about 6. The effect of MDF on new grain evolution and the mechanisms of grain refinement are discussed in details.

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“…The above stated principles of producing bulk semiproducts with a uniform UFG structure have been successfully applied at IMSP RAS to dozens of different metals and alloys, such as titanium and titanium-based alloys, steels, aluminum, magnesium, copper, nickel based alloys including hard-todeform nickel-based superalloys and intermetallic alloys (based on the compounds TiAl, Ti 3 Al, Ti 2 AlNb) [18][19][20][21][22][23][24][25][26][27][28][29]. The largest and most uniform UFG semi-products have been produced from the Ti-based alloy VT6.…”

Section: The Main Idea Of the Techniquementioning

confidence: 99%

Principles of processing of an ultrafine-grained structure in large-section billets

Imayev¹,

Назаров²,

Mulyukov³

et al. 2014

LoM

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Summarizing the results of the studies performed at IMSP RAS, the principles of processing of a uniform ultrafine-grained (UFG) structure in large-section billets by means of the technique of multiple isothermal forging are formulated. These principles imply a uniform introduction of plastic strain energy into large-section billets, minimization of contact friction between the die-set and the billets, and deformation processing in the temperature and strain-rate conditions that are most favourable for the development of dynamic recrystallization.

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Low-temperature superplasticity of titanium aluminides

Cited by 69 publications

References 19 publications

Partial Grain Refinement in Al-3%Cu Alloy during ECAP at Elevated Temperatures

Partial Grain Refinement in Al-3%Cu Alloy during ECAP at Elevated Temperatures

Effect of Pass Strain on Grain Refinement in 7475 Al Alloy during Hot Multidirectional Forging

Principles of processing of an ultrafine-grained structure in large-section billets

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