Preparation method of wrought magnesium alloy sheet with mixcrystal structure and non-basal plane texture

Abstract

The invention discloses a preparation method of a wrought magnesium alloy sheet with a mixcrystal structure and a non-basal plane texture. The preparation method comprises the following steps of S1, conducting hot rolling, shearing and continuous bending on the wrought magnesium alloy sheet at the rolling pass reduction of 10-15%, and then conducting quenching; S2, cutting the quenched smooth sheet, reheating the quenched smooth sheet to the rolling temperature, turning over the wrought magnesium alloy sheet by 180 degrees to exchange the upper surface and the lower surface, conducting hot rolling, shearing and continuous bending on the wrought magnesium alloy sheet at the rolling pass reduction of 10-15%, and then conducting quenching; S3, repeating the step S2 until the accumulated reduction of the wrought magnesium alloy sheet is not less than 40%; S4, conducting recrystallization annealing at the annealing temperature of 300-450 DEG C and the heat preservation time of 1-8 min, andthen conducting quenching; and S5, conducting recovery annealing at the annealing temperature of 100-220 DEG C and the heat preservation time of 60-600 min. Through the preparation method, intercoordination of the mixcrystal structure and the non-basal plane texture can be realized in the wrought magnesium alloy sheet, and accordingly, intercoordination of the strength property, the plasticity property and the indoor-temperature forming property of the wrought magnesium alloy sheet can be realized.

Description

technical field [0001] The invention relates to the technical field of metal plate rolling, in particular to a method for preparing a magnesium alloy plate with mixed crystal structure and non-basal surface texture. Background technique [0002] The deformed magnesium alloy sheet has limited independent slip system at room temperature due to its hexagonal close-packed crystal structure, which makes the plastic deformation ability of the deformed magnesium alloy sheet poor at room temperature. In addition, wrought magnesium alloy sheets tend to form a strong basal texture during processing and preparation, which leads to difficulties in subsequent forming and processing, which restricts its large-scale application. Realizing the weak / non-basal texture of deformed magnesium alloy sheet through texture regulation is an important means to improve its deformation ability at room temperature. [0003] At present, extensive research has been carried out on special processing techn...

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Problems solved by technology

At present, the liner rolling process based on the concept of severe plastic deformation has been able to prepare deformed magnesium alloy sheets with mixed crystal structure, achieving a significant increase in the strength of the sheet (yield strength ~221MPa) and plasticity (fracture elongation rate~26%), but the prepared sheet is still basal texture, therefore, the room temperature formability of the sheet is not significantly improved compared with the general basal texture deformed magnesium alloy sheet

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