Effect of ultrasound on the characteristics of superplastic deformation

Myshlyaev, М. M.; Шпейзман, В. В.; Klubovich, V. V.; Кулак, М. М.; Lyu, G.

doi:10.1134/s1028335815120046

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“…Microstructure of Ti-6Al-4V alloy after ECAP (a) and ECAP followed by UST (b) Table 2. Volume fractions of phases and specific areas of phases and grains in Ti-6Al-4V after ECAP and ECAP followed by UST It should be noted that in situ action of ultrasound during superplastic tension studied in [10] has the same effect on superplastic elongation and flow stress, as the prior-deformation UST studied here, but the value of strain rate sensitivity does not change. Therefore, the mechanisms of the effect are different in these two cases.…”

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confidence: 52%

“…However, all studies carried out up to date have been related to the properties of UFG materials at ambient temperature and, by the authors' knowledge, there have been no studies on the effect of ultrasound on high-temperature mechanical properties of UFG materials except [10], where superplastic deformation of aluminum-lithium alloy 1420 under the simultaneous action of tension load and axial ultrasonic vibrations was studied.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Ultrasonic Treatment on the Characteristics of Superplasticity of Titanium Alloy Ti-6Al-4V

Samigullina

Murzinova

Mukhametgalina

et al. 2018

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Effect of ultrasonic treatment (UST) with an amplitude of oscillating tension-compression stresses 100 MPa on the characteristics of superplastic deformation of Ti-6Al-4V alloy with an ultrafine grained (UFG) structure processed by equal-channel angular pressing (ECAP) is studied. During tensile tests at 600°C with initial strain rates in the interval from 10-4 to 10-3 s-1, ultrasonically irradiated samples exhibit a reduced flow stress, higher values of the strain rate sensitivity coefficient and elongation to failure as compared to the samples tested directly after ECAP. Detailed studies of the microstructure of samples subjected to ECAP only and ECAP followed by UST revealed no considerable differences. It is suggested that the UST affected fine structure of the material bringing them to a state with a higher ability of relaxation of deformation-induced defects.

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confidence: 52%

Section: Introductionmentioning

confidence: 99%