Method for improving fluidness of magnesium alloy melt and special agitating apparatus

A magnesium alloy fluidity technology, applied in the field of a method to improve the fluidity of magnesium alloy melts and a special stirring device, can solve the problems of reducing the plasticity of magnesium alloys, the toxicity of Be elements, and the inability to add alloy elements. , to achieve the effects of low energy consumption and cost, wide application range and simple process

Inactive Publication Date: 2009-07-22
TSINGHUA UNIV
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Problems solved by technology

By increasing the content of Al in AZ91D magnesium alloy, its fluidity can be improved, but when the content of Al exceeds 10%, the plasticity of magnesium alloy will be greatly reduced; adding a small amount of calcium element in AZ91D magnesium alloy can significantly reduce its oxidation tendency, refine Grain and grain boundary structure, improve fluidity and reduce heat treatment sensitivity, but when the added calcium element exceeds a certain amount, it will greatly increase the tendency of the alloy to produce

Method used

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  • Method for improving fluidness of magnesium alloy melt and special agitating apparatus
  • Method for improving fluidness of magnesium alloy melt and special agitating apparatus
  • Method for improving fluidness of magnesium alloy melt and special agitating apparatus

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Embodiment 1

[0028] The alloy used in the test is AZ91D magnesium alloy, and its chemical composition is shown in Table 1; calcium element is added to the alloy in the form of master alloy Mg-30%Ca. The consumption of magnesium alloy in this test is 12Kg, and the molar ratio of the magnesium element in the magnesium alloy and the calcium element in the Mg-Ca master alloy is (0.15~1.5)×10 3 , the preferred molar ratio is (2.1~3.7)×10 2 .

[0029] Table 1 Chemical composition of AZ91D magnesium alloy (mass percentage, %)

[0030]

[0031] The stirring device used in this example is the sleeve screw type mechanical stirring device provided by the present invention. The device comprises a holding furnace 4 with a sealing cover whose outer wall is composed of heating elements 3; wherein, a crucible 17 with a sealing cover is provided in the holding furnace cavity; the agitator passes through the sealing cover of the holding furnace 4 and the sealing cover of the crucible 17 , placed in th...

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Abstract

The invention discloses a method for improving fluidity of magnesium alloy melts on the basis of revealing the isothermal viscosity changing law of magnesium alloy melts containing calcium and also discloses a special stirring device. The method composes the following steps: (1) the magnesium alloy and Mg-Ca master alloy are heated and melted to obtain overheat magnesium alloy melt containing calcium; and (2) the overheat magnesium alloy melt containing calcium is transferred to a holding furnace for stirring treatment. The 'modification+stirring' composite technology processing treatment is carried out on the overheat magnesium alloy melt and the effect is not a simple cumulative effect but a superimposed compound effect, so the method makes full use of advantages of two melts processing treatment and effectively improves the structure property and fluidity of alloys. The method has the advantages of simple technology, wide application scope, and the like.

Description

technical field [0001] The invention belongs to the technical field of magnesium alloy production, and relates to the viscosity change rule and processing method of magnesium alloy melt, in particular to a method for improving the fluidity of magnesium alloy melt and a special stirring device. Background technique [0002] Magnesium alloys are widely used in automobiles, communications, electronics and other fields due to their excellent shock absorption performance, good casting performance, high specific strength and specific stiffness. At present, with the rapid development of lightweight technology, higher requirements are put forward for the comprehensive performance of magnesium alloys. How to further improve the alloy structure and formability is a common concern of the majority of researchers. [0003] AZ91D magnesium alloy is one of the most widely used casting magnesium alloys, and the amount used in die casting magnesium alloys alone accounts for nearly 90%, showi...

Claims

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Application Information

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IPC IPC(8): C22C1/03C22C23/00B22D21/04
Inventor 李培杰弭光宝何良菊王晶
Owner TSINGHUA UNIV
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