FEATURES OF DESTRUCTION AT TENSILE TESTING OF THE Zr-BASED BULK AMORPHOUS ALLOY SUBJECTED HPT

D. Gunderov, E. Boltynuk, E. Ubyivovk, A. Churakova, A. Lukyanov, A.G. Raab, D. Khasanova, A. Churyumov show affiliations and emails
Received 29 September 2016; Accepted 29 September 2016;
This paper is written in Russian
Citation: D. Gunderov, E. Boltynuk, E. Ubyivovk, A. Churakova, A. Lukyanov, A.G. Raab, D. Khasanova, A. Churyumov. FEATURES OF DESTRUCTION AT TENSILE TESTING OF THE Zr-BASED BULK AMORPHOUS ALLOY SUBJECTED HPT. Lett. Mater., 2016, 6(4) 322-326
BibTex   https://doi.org/10.22226/2410-3535-2016-4-322-326

Abstract

The microstructure and mechanical properties of the Zr62Cu22Al10Fe5Dy1 amorphous alloy processed by high-pressure torsion at temperatures of 20° and 150°С were investigated. Study by transmission electron microscopy and XRD did not reveal any structural transformations. The samples of the amorphous alloy, prior to and after processing by HPT, fracture in a brittle manner during tensile testing at different temperatures, including 300°С. In the initial amorphous state, the maximum fracture stress is 1410 MPa. During testing of the samples after HPT processing, the samples fracture under different stress values. Fractography after tests on samples of stretching before and after HPT differs. On the surface, the destruction of the original break BMG observed close to the "patching" with large deep ridges separation. The average distance between the crests of such separation is about 5 microns. The area between the crests of separation is preferably not noticeable relief, rounded, cup-shaped. The BMG subjected to HPT n=5 at T=20°C, the area of separation between the large ridges have an internal relief, i.e., the area between the crests of separation is further fragmented "secondary" crests separation. Drops, which were formed in the tops of the ridges in the process of separation of local heating on the surface of fracture BMG «HPT 20°C» have become more dispersed. It can be assumed that it shows an increase of local plastic deformation in the fracture. Thus, a preliminary HPT processing evidently changes the structural evolution during a subsequent crystallization annealing.

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