Method for quickly preparing magnesium alloy fine crystalline wire and superfine magnesium alloy wire based on drawing process

Abstract

The invention discloses a method for quickly preparing a magnesium alloy fine crystalline wire and a superfine magnesium alloy wire based on a drawing process, belongs to the field of nonferrous metalplastic forming, and aims to solve the technical problem that an existing magnesium alloy drawing process is liable to have wire breakage, and is not ideal in crystalline grain size. The method for preparing the magnesium alloy fine crystalline wire comprises the following steps: thermally extruding magnesium alloy cast ingots into bars with diameters Phi being 6mm-10mm, and annealing the bars; II, performing thermal drawing on the bars, and immediately water-cooling the bars to the room temperature after each-pass thermal drawing; III, performing continuous cold-drawing on the bars, and air-cooling the bars to the room temperature; and IV, repeating operations of steps II to III until the diameters Phi of the bars are 1.0mm-1.5mm. The method for preparing the superfine magnesium alloy wire comprises the following steps: step 1, performing continuous cold-drawing on the magnesium alloy fine crystalline wire until the diameter Phi of the wire is lower than 1.0 mm, and air-cooling the wire to the room temperature after annealing; and step 2, repeating the operation of step 1 until the diameter Phi of the wire is 0.10mm. The Phi 0.10mm wire prepared by the method has an average crystalline grain size of 1[mu]m.

Description

technical field [0001] The invention belongs to the field of plastic forming of non-ferrous metals; in particular, it relates to a method for preparing fine-grained magnesium alloy wires and ultra-fine magnesium alloy wires through high temperature hot drawing and room temperature cold drawing. Background technique [0002] Magnesium alloy is the lightest structural metal material in engineering applications. It is environmentally friendly and recyclable. However, magnesium has a close-packed hexagonal crystal structure, which leads to poor plastic deformation ability of magnesium alloy at room temperature and difficulty in processing and forming. This limits the application of magnesium alloys in the structural field. [0003] Hot working is one of the most important methods to improve the microstructure and properties of magnesium alloys and enhance their plastic working ability. However, when magnesium alloy filaments are prepared by hot extrusion, the requirements for t...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a combination of high temperature hot drawing and room temperature cold drawing to greatly reduce the grain size of magnesium alloys, increase the cumulative deformation of drawing, reduce the number of intermediate annealing times, and reduce the material selection requirements for drawing magnesium alloys at room temperature. Thereby improving production efficiency, reducing energy consumption, and improving the performance of the magnesium alloy fine-grained magnesium alloy wire and the preparation method of the ultra-fine magnesium alloy wire; it solves the problems of easy wire breakage and unsatisfactory grain size in the existing magnesium alloy drawing process question

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