Heat resistant magnesium alloy and composite material containing heat resistant magnesium alloy and its preparation method

Abstract

The invention provides a heat-resistant magnesium alloy, and the compositions in mass percentage of the alloy are: more than or equal to 3 percent and less than or equal to 7 percent of Al, more than or equal to 0.5 percent and less than or equal to 7 percent of Zn more than or equal to 0.5 percent and less than or equal to 2 percent of Ti, more than or equal to 1 percent and less than or equal to 6 percent of Sn, more than or equal to 0.01 percent and less than or equal to 0.1 percent of La, more than or equal to 0.5 percent and less than or equal to 4 percent of Si and more than or equal to 0.05 percent and less than or equal to 0.6 percent of Zr and the balance being manganese. The heat-resistant magnesium alloy uses only such normal non-precious rare elements as Al, Zn, Ti, Sn, La, Si and Zr, has low cost and keeps good heat-resistant property without adding the elements; and the plastic deformation rate of the alloy is 0.2 to 0.35 percent at the temperature of 250 DEG C and under the stress of 30Mpa, and the alloy can be widely applied in the working environment of high temperature. The heat-resistant magnesium-based porous composite material consists of heat-resistant magnesium alloy and a minimum-density heat-resistant inorganic porous material, has heat-resistant function and good damping property below the temperature of 250 DEG C, can be widely applied to the heat-resistant vibration-absorption parts and components of rapid machinery like an automobile, and has the advantages of good vibration-absorption, sound insulation and voice confusion. The composite material is simple in preparation process and low in production cost.

Description

1. Technical field [0001] The invention belongs to the technical field of magnesium alloys, in particular to a heat-resistant magnesium alloy, a composite material containing the heat-resistant magnesium alloy and a preparation method thereof. 2. Background technology [0002] Magnesium alloys are widely used in the manufacture of industrial products because of their high specific strength and specific stiffness. However, the existing common magnesium alloys have poor heat resistance. If such an alloy is used as the matrix of the composite material, the heat resistance of the composite material will also be poor. At present, there are many studies on heat-resistant magnesium alloys: patent 200710056175.4 proposes a preparation method of porous magnesium-expanded perlite composite material. The matrix used in this patent is metal Mg or AZ91 magnesium alloy, which has low resistance to heat resistance. In addition, due to the vacuum infiltration method, the requirements for p...

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Problems solved by technology

The technical defect in the above patents is that the element Ca is used, because the nature of Ca is very active, and the absorption rate in the alloy is unstable, which ultimately affects the performance of the alloy.

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