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High strength and high thermal conductivity magnesium alloy and preparation method thereof

A magnesium alloy, high thermal conductivity technology, applied in the field of non-ferrous metal materials and processing, can solve the problems of increased frequency of electron and phonon diffraction, increased grain boundary distortion, low mechanical strength of pure magnesium, etc. Enhanced fatigue resistance, excellent fatigue resistance, and the effect of environmental protection

Active Publication Date: 2021-11-05
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in terms of heat dissipation of electronic components and large structural parts, the existing magnesium alloys still cannot meet the use standards of high strength and fast heat conduction. The reasons are as follows: First, the room temperature thermal conductivity of pure magnesium is 156W / (m·K) -1 , second only to copper and aluminum, but the mechanical strength of pure magnesium is extremely low, its yield strength is difficult to exceed 100MPa, and the fatigue limit is even lower than 50MPa; second, pure magnesium after high alloying and grain refinement, The mechanical strength has been greatly improved, but high alloying will cause the increase of solid solution elements and the degree of grain boundary distortion. Grain refinement will increase the density of grain boundaries and increase the frequency of diffraction of electrons and phonons, which will seriously damage the thermal conductivity. , often less than 70W / (m·K) -1

Method used

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  • High strength and high thermal conductivity magnesium alloy and preparation method thereof
  • High strength and high thermal conductivity magnesium alloy and preparation method thereof
  • High strength and high thermal conductivity magnesium alloy and preparation method thereof

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preparation example Construction

[0037] As a general inventive concept, the present invention also provides a method for preparing a high-strength and high-thermal-conductivity magnesium alloy, the steps of which are as follows:

[0038] According to the requirements of the alloy composition, the raw materials are prepared, the bar is prepared, and the combined drawing and torsion deformation is carried out on the magnesium alloy several times at room temperature to 180°C. Each pass of the combined drawing and torsion deformation includes one drawing deformation and one torsion deformation. The drawing processing rate in each pass is 5-15%, and the torsion accumulated surface shear strain of each pass is 0.1-0.5. After each pass, stress-relief annealing and water quenching are performed after the torsion deformation. After all passes are completed, directly Water quenching to obtain magnesium alloy rods or wires.

[0039] Specifically, in this solution, the following steps can be adopted to prepare the rods: ...

Embodiment 1

[0048] A high-strength and high-thermal-conductivity magnesium alloy, by mass %, containing 0.6% Mn, 0.3% Sb, 0.9% Ca and 0.5% Nd, the balance being Mg and unavoidable impurities, wherein the total amount of Mn and Sb is 0.9% , the mass percentage ratio of Mn, Sb and Ca is 1.

[0049] A method for preparing the above-mentioned high-strength and high-thermal-conductivity magnesium alloy of the present embodiment comprises the following steps:

[0050] According to the raw material Mg-0.6Mn-0.3Sb-0.9Ca-0.5Nd (mass percentage), casting into a magnesium alloy ingot billet, processing it into a rod with a diameter of 10mm, and homogenizing annealing; heating the rod to 150°C for several times Combined deformation of drawing and unidirectional torsion, each combined deformation includes 1 drawing deformation and 1 unidirectional torsion deformation, in each pass, the drawing processing rate is 10%, and the surface shear strain accumulated by torsion is 0.3 ; After each pass of comb...

Embodiment 2

[0058] A high-strength and high-thermal conductivity magnesium alloy, by mass %, contains 0.1% In, 0.5% Sr and 1% Cu, the balance is Mg and unavoidable impurities, wherein the total amount of In and Sr is 0.6%, In, Sr The mass percentage ratio with Cu is 0.6.

[0059] A method for preparing the above-mentioned high-strength and high-thermal-conductivity magnesium alloy of the present embodiment comprises the following steps:

[0060] According to the raw material Mg-0.1In-0.5Sr-1.0Cu (mass percentage), cast a magnesium alloy ingot billet, process it into a bar with a diameter of 6mm, and homogenize annealing; carry out several drawing and grinding on the No. 3 bar at room temperature Combined deformation of two-way reciprocating torsion, each combined deformation includes one drawing and one bidirectional reciprocating torsion, the drawing processing rate in each pass is 8%, and the surface shear strain accumulated by torsion is 0.2; Finally, No. 3 bar was subjected to stress...

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Abstract

The invention provides a high-strength and high-thermal conductivity magnesium alloy, which contains 0.05-1.0% of element X and 0.2-1.5% of element Y in terms of mass %, and the element X is one or more of cobalt, indium, manganese, antimony and strontium Two or more, the element Y is one or more of calcium, copper and nickel, and the mass ratio of the element X to the element Y is less than 1; the present invention also provides a magnesium alloy with high strength and high thermal conductivity Preparation. The magnesium alloy of the present invention is low in cost and has high strength, high fatigue resistance and high thermal conductivity at the same time. The preparation method of the present invention has reasonable process design, simple equipment requirements, convenient operation, low cost, and high efficiency. Magnesium alloy with symmetrical gradient microstructure, high strength, high fatigue resistance and high thermal conductivity.

Description

technical field [0001] The invention belongs to the technical field of non-ferrous metal materials and processing, and relates to a high-strength, high-thermal-conductivity magnesium alloy and a preparation method thereof, in particular to a radially symmetrical gradient-structured microstructure with high strength and high fatigue resistance Microalloyed magnesium alloy rod or wire with high thermal conductivity and its preparation method. Background technique [0002] Magnesium alloy is currently the most ideal lightweight structural material, and has great application potential in the fields of national defense, transportation, and 3C products. However, in terms of heat dissipation of electronic components and large structural parts, the existing magnesium alloys still cannot meet the use standards of high strength and fast heat conduction. The reasons are as follows: First, the room temperature thermal conductivity of pure magnesium is 156W / (m·K) -1 , second only to c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/00C22F1/06C22C23/06
CPCC22C23/00C22C23/06C22F1/06
Inventor 霍庆欢冯慧娟
Owner CENT SOUTH UNIV