Low-cost high-strength high-toughness high-thermal conductivity wrought magnesium alloy and preparation method thereof

A low-cost technology for deforming magnesium alloys, applied in the field of deformation processing of metal materials and non-ferrous metal materials, can solve the problems of high cost and failure to solve the thermal conductivity of alloys, and achieve the effect of low cost, excellent comprehensive performance and excellent comprehensive performance.

Active Publication Date: 2016-07-13
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of rare earth elements (0.1-10%) in this alloy series leads to high cost and low strength (yield strength less than 150MPa, tensile strength less than 240MPa), and the problem of thermal conductivity of the alloy cannot be solved.
[0015] Looking at the existing technology, the current magnesium alloys have not yet taken into account the concerns of thermal conductivity, strength and plasticity. It is necessary to develop new high-strength and high-toughness thermally conductive magnesium alloys to meet the needs of thermal conductivity, strength and elongation. higher demand situations

Method used

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  • Low-cost high-strength high-toughness high-thermal conductivity wrought magnesium alloy and preparation method thereof
  • Low-cost high-strength high-toughness high-thermal conductivity wrought magnesium alloy and preparation method thereof
  • Low-cost high-strength high-toughness high-thermal conductivity wrought magnesium alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] (1) The design mass percentage of Mg-2.5Zn-0.3Ca-0.4La-0.3Mn is proportioned according to the above, and the materials described are pure Mg ingot, pure Zn ingot, Mg-15wt%Ca, Mg-1.5wtMn intermediate alloy, Mg-20wt%La master alloy;

[0056] (2) Melting:

[0057] Put the above-mentioned pure Mg ingot and Zn ingot into the melting furnace, at 780°C, SF 6 After complete melting under gas protection, add Mg-Ca\Mg-Mn master alloy, adjust the temperature and set the temperature at 750℃, SF 6 Melt completely under gas protection; then add Mg-La master alloy, at 750℃, SF 6 Melt completely under gas protection, and add RJ-5 flux to cover the surface of the melt at the same time; then adjust the temperature in the furnace to 780°C, and pass Ar gas preheated at 750°C into the melt, and add RJ-5 flux at the same time Carry out refining for 5-15 minutes to obtain a refined melt; then transfer the refined melt to a static furnace under a pressure of 0.01-0.02 MPa, let it stand at 7...

Embodiment 2

[0063] The difference between this embodiment 2 and the embodiment 1 is that: the ratio of the alloy components by mass percentage is Mg-1.5Zn-0.3Ca-0.4La-0.4Mn.

[0064] The performance at room temperature of the low-cost, high-strength, high-toughness, and high-thermal conductivity deformable magnesium alloy prepared in Example 2: the tensile strength is 336MPa, the yield strength is 311MPa, the elongation is 30%, and the thermal conductivity is about 135W.(m.K) -1 .

Embodiment 3

[0066] The difference between Example 3 and Example 1 is: the alloy composition ratio is Mg-1.5Zn-0.3Ca-0.4La-0.1Mn in mass percent;

[0067] It is detected that the comprehensive properties of the low-cost, high-strength, high-toughness, and high-thermal conductivity deformed magnesium alloy prepared in Example 3 at room temperature: the tensile strength is 330MPa, the yield strength is 325MPa, the elongation is 33%, and the thermal conductivity is about 140W. ( m.K) -1 .

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Abstract

The invention discloses a low-cost high-strength high-toughness high-thermal conductivity wrought magnesium alloy and a preparation method thereof. The low-cost high-strength high-toughness high-thermal conductivity wrought magnesium alloy comprises, by mass, 0.5-3% of Zn, 0.1-0.5% of Ca, 0.1-0.5% of La, 0.1-0.4% of Mn and the balance Mg and unavoidable impurities. The preparation method comprises 1, preparing a magnesium alloy cast ingot, 2, preparing an extruded blank, and 3, carrying out extrusion deformation treatment to obtain the low-cost high-strength high-toughness high-thermal conductivity wrought magnesium alloy. The low-cost high-strength high-toughness high-thermal conductivity wrought magnesium alloy has thermal conductivity of 125-140W.(m.k)<-1>, tensile strength of 330-360MPa, yield strength of 310-330MPa and an elongation percentage of 15-35%.

Description

technical field [0001] The invention relates to the technical field of deformation processing of nonferrous metal materials, and belongs to the technical field of metal materials, in particular to a low-cost, high-strength, high-toughness, high-thermal-conduction deformed magnesium alloy and a preparation method thereof. Background technique [0002] Magnesium alloy is the lightest structural material currently used. Its density is 2 / 3 of aluminum and 1 / 5 of steel. It has high specific strength and specific modulus, rich resources, energy saving and environmental protection, and has a wide range of applications. It is recognized as "the most promising new material in the 21st century" by the world. [0003] The thermal conductivity of pure magnesium at room temperature is high, about 157W / m*K, but the strength is too low, and the tensile yield strength in the cast state is about 21MPa. After pure magnesium is alloyed, its strength is significantly improved, but the thermal ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/04C22C23/06C22C23/00C22F1/06
Inventor 徐世伟唐伟能秦云蒋浩民张丕军
Owner BAOSHAN IRON & STEEL CO LTD
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