Strain-induced structural and phase transitions in superplastic eutectic

Korshak, V. F.; Kryshtal, A. P.; Mateychenko, P.V.; Sirenko, A. F.

doi:10.3103/s1062873807120064

Cited by 6 publications

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“…The X ray diffraction studies performed previously [5] revealed that in the preliminarily swaged (in a hydraulic press) samples of the alloy cast onto a copper substrate there is present an amorphized interlayer. The analysis performed indicates that an X ray amor phous component is also present in swaged and cast samples studied in this work.…”

Section: Resultsmentioning

confidence: 99%

“…It has been shown in [5], based on the X ray dif fraction investigations, in particular, from an analysis of the angular dependence of the intensity of the dif fuse scattering of X ray radiation by samples deformed under superplasticity conditions, that the SP flow in the Sn-38 wt % Pb alloy occurs against the back ground of the phase transformation-decomposition of supersaturated solid solutions. Such decomposition starts from the formation of regions of short range order decomposition, which are further transformed into precipitates of stable phases.…”

Section: Introductionmentioning

confidence: 99%

“…It has been shown that, at the rates of solidification that ensure the manifesta tion of the superplasticity effect, the volume proportion between the tin based and lead based phases in the alloy do not correspond to that predicted by the equilib rium tin-lead phase diagram [3][4][5]. In the experiments performed in [6,7], it has been established that the aging is accompanied by changes in the phase state of the Sn-38 wt % Pb alloy.…”

Section: Introductionmentioning

confidence: 99%

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X-ray diffraction study of structural and phase states of a superplastic Sn-38 wt % Pb alloy and their variations under the effect of external mechanical stresses and aging

Korshak

Shapovalov

Samsonik

et al. 2012

Phys. Metals Metallogr.

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Structural and phase states of the eutectic alloy Sn-38 wt % Pb, which exhibits superplastic prop erties at room temperature, have been studied using samples that were cast, forged in a hydraulic press tõ 73%, aged in the as cast state, as well as preliminarily forged samples and samples deformed in the regime of superplasticity. It has been shown that the phase state of the alloy in as cast condition does not correspond to the equilibrium tin-lead phase diagram. The superplastic flow of the alloy occurs against the background of processes of decomposition of the supersaturated solid solution. In the preliminarily forged samples, the aging is accompanied by an increase in the concentration of lead in the surface layers. This is related, in par ticular, to the existence of tensile stresses in the tin based phase and to their relaxation in the process of aging. In the structure of cast and preliminarily forged samples, an amorphous crystalline component has been revealed, which most likely is located at grain boundaries. The experimental results agree well with the previ ously obtained results that are indicative of the nonequilibrium character of the initial structural phase state of the Sn-38 wt % Pb alloy and of the occurrence of structural phase transformations under conditions of superplastic deformation, and substantially supplement them.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%