Method for controlling long-periodic structure to strengthen magnesium alloy matrix crystallization texture through direct current magnetic field

Abstract

The invention relates to a method for controlling a long-periodic structure to strengthen magnesium alloy matrix crystallization texture through a direct current magnetic field, which comprises the following steps of: 1) melting the magnesium alloy; keeping the melted magnesium alloy warm under a certain degree of superheat; and then placing a preheated die in a direct current magnetic field solidification device, wherein the degree of superheat of the alloy is 10-150 DEG C, and the preheating temperature of the die is 100-700 DEG C; and 2) pouring the melted alloy into the die; switching on a direct current control device in the direct current magnetic filed solidification device after the completion of pouring so as to solidify the melted alloy completely under the effect of direct current magnetic field, wherein the strength of the direct current magnetic field is 0.1-1.0T; and placing the die between two magnetic poles of the direct current magnetic field solidification device, pouring the melted alloy into the die, and carrying out action on the melted alloy through the direct current magnetic field generated between two magnetic poles. The method can control the long-periodic structure to strengthen the magnesium alloy matrix crystallization texture effectively, thus having advantages of being free from contamination, simple in technology, convenient in operation, easy to control and the like.

Description

technical field [0001] The invention relates to a method for enhancing the crystalline texture of a magnesium alloy matrix by controlling a long-period structure with a DC magnetic field. Background technique [0002] As a green and environmentally friendly alloy, magnesium alloy has many properties superior to other commonly used metal materials, such as high specific strength, high specific stiffness, good vibration damping ability, excellent thermal conductivity and electrical conductivity, good dimensional stability and electromagnetic It has broad application prospects in the fields of aviation, automobiles and electronic communications. In many types of magnesium alloys, the long-period structural phase enhances the good comprehensive mechanical properties of magnesium alloys, mainly because the long-period structural phase hinders the movement of dislocations and leads to strain hardening. It is a high-temperature stable phase, so the long-period structural phase-rei...

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Problems solved by technology

However, in the DC magnetic field solidification experiment of the above-mentioned researchers, the DC magnetic field strength used was too small (less than 0.1T), and the influence of the alloy solidification rate was not considered, so the control effect of the DC magnetic field on the crystal texture of the alloy could not be fully utilized. At the same time, the above research did not involve magnesium alloy in the experimental materials, and the research on the effect of DC magnetic field on the crystallization texture of magnesium alloy with long-period structure reinforcement is still in a blank state

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