A kind of quasi-single crystal pipe material and preparation method thereof

Abstract

The invention relates to the technical field of materials, in particular to a quasi-single crystal tube and a preparation method thereof; the crystallographic texture of the quasi-single crystal tube is continuously rotationally symmetrical around the axis of the tube, and the grain boundary orientation difference in the tube is greater than 15 The proportion of large-angle grain boundaries of °≤10%; a certain crystal orientation of the crystal in the quasi-single crystal tube material <uvw>The preferred orientation is parallel to the circumferential direction of the tube; the preferred orientation of a crystal plane {hkl} of the crystal in the quasi-single crystal tube is parallel to the tangent plane of the tube wall or the normal preferred orientation of the crystal plane is parallel to the radial direction of the tube; The quasi-single crystal of the present invention is formed by the orientation of each grain of the polycrystal gradually rotating to a macroscopic preferred direction during the deformation and annealing process, and there is no physical interface between the "new phase" and the parent phase during the preparation process.< / uvw>

Description

technical field [0001] The invention relates to the technical field of materials, in particular to a quasi-single crystal tube material and a preparation method thereof. Background technique [0002] Single crystal (mono-crystal, single crystal), the microscopic particles (atoms, ions, molecules, etc.) inside the crystal are regularly and periodically arranged in three-dimensional space, and the whole crystal is composed of the same spatial lattice in the three-dimensional direction - lattice The composition is 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 an angle of 2π / n, it completely coincides with the lattice when it is not rotated. A feature like a single crystal lattice that is rotated by a specific angle of 2π / n and coincides with itself is called discrete rotational symmetry. Corr...

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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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