1. Structural changes during superplastic deformation of high-strength alloy 1933 of the Al-Mg-Zn-Cu-Zr system
- Author
-
A. L. Samsonik, V. V. Litvinenko, A. V. Poida, V. P. Poida, R. V. Sukhov, D. E. Pedun, and V. V. Bryukhovetskii
- Subjects
Materials science ,Metallurgy ,Alloy ,Superplasticity ,engineering.material ,Condensed Matter Physics ,Tension (geology) ,Phase (matter) ,Materials Chemistry ,engineering ,Fracture (geology) ,Fiber ,Deformation (engineering) ,Chemical composition - Abstract
The strain rate-temperature conditions of manifestation of the effect of high-temperature superplasticity by samples of an 1933 alloy have been established. Features of the structural state, phase composition, and deformation relief of samples of this alloy have been investigated. It has been established that grain-boundary sliding occurs intensely along both boundaries of ultrafine grains and boundaries of coarse polygonized grains parallel to the tension axis of the sample. In near-surface grain-boundary pores and in cracks that were formed and developed at the surface of the working part of these samples in the course of superplastic deformation, fiber structures were detected. The chemical composition of fibers has been investigated. The kinetics of the occurrence of phase transformations in the 1933 alloy in the course of heating of its samples to the temperature of tests has been studied, and probable causes for partial melting of the 1933 alloy have been analyzed. Fracture mechanisms for the samples deformed superplastically under the optimum conditions have been established.
- Published
- 2013