Pseudo-single crystal pipe and preparation method thereof

Abstract

The invention relates to the technical field of materials, in particular to a pseudo-single crystal pipe and a preparation method thereof. The crystallographic texture of the pseudo-single crystal pipe is in continuous rotational symmetry around the axis of the pipe, and the proportion of large-angle grain boundaries with the grain boundary orientation difference larger than 15 degrees in the pipeis smaller than or equal to 10%. The preferred orientation of a certain crystal direction of the crystal in the pseudo-single crystal pipe is parallel to the circumferential direction of the pipe; the preferred orientation of a certain crystal face [hkl] of the crystal in the pseudo-single crystal pipe is parallel to the tangent plane of the pipe wall or the normal preferred orientation of the crystal face is parallel to the radial direction of the pipe. The pseudo-single crystal is formed by gradually rotating various crystal grain orientations to a macroscopic preferred direction in the deformation and annealing process of the polycrystal, and a physical interface between a'new phase 'and a parent phase does not exist in the preparation process.

Description

technical field [0001] The invention relates to the technical field of materials, in particular to a quasi-single crystal tube and a preparation method thereof. Background technique [0002] Single crystal (mono-crystal, single crystal), the microscopic particles (atoms, ions, molecules, etc.) Composition, arranged in a long-range order. The lattice exhibits strict translational symmetry and n-fold rotational symmetry (n=2, 3, 4, 6) in three-dimensional space. Here, n-fold rotational symmetry means that when the lattice is rotated by 2π / n angles, it completely coincides with the unrotated lattice. The feature of a single crystal lattice that rotates by a specific angle 2π / n and coincides with itself is called discrete rotational symmetry. Corresponding to discrete rotational symmetry is continuous rotational symmetry (Continuous rotational symmetry), that is, any angle of rotation of an object around a certain axis completely coincides with the object before rotation. Fo...

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Problems solved by technology

However, there is a clear physical interface between the quasi-single crystal and its parent phase that have been formed in the preparation process of the above preparation method.

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