Preparation method of magnesium alloy grain refining agent

Abstract

The invention belongs to related technical field of nonferrous metal casting formation, and relates to a preparation method of a magnesium alloy grain refining agent. An aluminum-contained magnesium alloy is mixed with magnesium carbonate powder for smelting, is insulated by 20 minutes at 740 DEG C, is cast in a low-carbon steel mold, and is cooled to 350-400 DEG C for solid solution treatment by 16-20 hours to obtain the magnesium alloy grain refining agent. The magnesium alloy grain refining agent obtained by the preparation method is low in cost, free of pollution and obvious in refining effect. The grain size of an AZ31 magnesium alloy, without the magnesium carbonate powder, cast after insulation by 20 minutes at 740 DEG C is about 370 microns, and is shown in the drawing 1. After the magnesium carbonate powder with 0.5-5% of mass percentage is added, the grain size of the AZ31 magnesium alloy cast after insulation by 20 minutes at 740 DEG C is about 117 microns, and is shown in the drawing 2; and the grain size is refined by 68.4%. After the magnesium carbonate powder is added in other aluminum-contained magnesium alloys, the excellent grain refining effect also can be achieved.

Description

technical field [0001] The invention belongs to the technical field related to non-ferrous metal casting and molding, and relates to a preparation method of a magnesium alloy grain refiner. Background technique [0002] Magnesium alloys have low density, high specific strength, high damping, high conductivity, good electromagnetic shielding and dimensional stability, especially magnesium alloys are rich in resources, low in manufacturing cost, easy to recycle, non-polluting and other environmental characteristics, and are regarded as For today's "green metal". As an important light-weight structural metal material, magnesium alloy has broad application prospects in industrial fields such as automobile manufacturing, communication electronics, and aerospace. [0003] Since magnesium is a hexagonal close-packed (HCP) structure material, its plastic deformation is limited to basal {0001}<11-20> slip and conical {10-12}<10-11> twinning at room temperature, so the ma...

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Problems solved by technology

[0003] Since magnesium is a hexagonal close-packed (HCP) structure material, its plastic deformation is limited to the basal plane {0001} slip and conical plane {10-12} twinning at room temperature, so the magnesium alloy The room temperature plastic processing ability is poor

Therefore, the processing of most magnesium alloy products is limited to casting (Casting), especially die-casting, while the deformed magnesium alloy products prepared by plastic processing such as forging (Forging), extrusion (Extrusion), and rolling (Rolling) are widely used in industry. few, which greatly limits the scope of application of magnesium alloys

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