Mg-RE alloy aging structure regulation and control method based on pre-deformation
A pre-deformation and alloying technology, applied in the field of metal material processing, can solve the problems of limiting the improvement of the mechanical properties of alloys and its development and application, and achieve the effects of increasing the nucleation rate, strengthening the alloy, and improving the mechanical properties of the alloy.
Inactive Publication Date: 2020-09-29
JIANGSU UNIV OF SCI & TECH
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[0003] Purpose of the invention: The purpose of the invention is to provide a method for regulating the aging structure of Mg-RE alloy based on pre-deformation, to solve the problem that the existing treatment process only optimizes the uniform precipitated phase structure, which limits the improvement of the mechanical properties of the alloy and the development and application of the problem
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[0017] The present invention will be further described below in conjunction with the accompanying drawings.
[0018] The method for regulating the aging structure of Mg-RE alloy based on pre-deformation disclosed by the present invention specifically includes the following:
[0019] (1) Select the ingot and cut it into thick plates of 100*100*8mm, the ingot is Mg-RE cast alloy, the specific composition is: Y4.17%, Nd 2.17%, Zr 0.42, the rest is Mg and non-removable Impurity elements, the total amount of non-removable impurity elements is ≤0.6%. ;
[0020] (2) Place the above sample in a box-type resistance furnace with sulfur powder and pyrite at a solution temperature of 525±5°C for 4-8 hours of solid solution treatment to ensure the eutectic phase of the ingot Basic ablation; after solid solution treatment, quench in warm water at 60-80°C, and the quenching interval time is ≤10s to prevent the precipitation of rare earth elements. The SEM test was carried out on the cast s...
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The invention discloses a Mg-RE alloy aging structure regulation and control method based on pre-deformation. The aging structure regulation and control method adopting solid solution, rolling and aging treatment is adopted on a magnesium alloy casting ingot, and a precipitation behavior of phases in the aging process is changed, regulated and controlled through twin crystals generated by rollingbefore aging and residual stress, specifically, the non-uniform precipitated phases are precipitated at the twin crystals generated by deformation through nucleation, the non-uniform precipitated phases are distributed along the twin crystals to form a sub-grain boundary, and the characteristic is utilized to regulate and control the twin crystals by controlling the rolling process, so that the purpose of regulating and controlling the sub-grain boundary is achieved; the residual stress after rolling enables matrix energy to be improved, the energy required for uniform nucleation in the agingprocess is reduced, and the nucleation rate is improved, so that the uniform precipitated phases are refined. By means of the Mg-RE alloy aging structure regulation and control method, the aging structure is effectively regulated and controlled, the aging performance of an alloy is improved by 10% or above compared with conventional heat treatment, the regulation and control method is simple, andindustrial application is easy.
Description
technical field [0001] The invention relates to the field of metal material processing, in particular to a method for regulating the aging structure of Mg-RE alloys based on pre-deformation. Background technique [0002] Mg-RE alloy has good heat resistance and excellent high-temperature performance, and can work for a long time at a temperature of 200-300 ° C. It has wider application prospects in the fields of automobiles, national defense, aerospace and electronics. The heat treatment process of solid solution + aging is one of the most conventional and effective strengthening methods for Mg-RE alloys at present. During the aging treatment, the Mg-RE alloy precipitated phase can be divided into two phases according to the nucleation and precipitation conditions: the fine uniform phase that nucleates uniformly in the magnesium matrix and the preferential nucleation and precipitation at defect sites such as twins and dislocations. heterogeneous precipitated phase. However...
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IPC IPC(8): C22F1/06C22C23/06
CPCC22C23/06C22F1/06
Inventor 宋京润伊军英邹波孙聪黄升姜洁
Owner JIANGSU UNIV OF SCI & TECH