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Rare-earth-free low-alloy ultra-high-strength magnesium alloy and preparation method thereof

An ultra-high toughness, low-alloy technology, applied in the field of magnesium alloy and its preparation, can solve the problem of low yield strength of magnesium alloy, and achieve the effect of high mechanical properties, excellent surface quality and low cost

Active Publication Date: 2020-06-09
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of low yield strength of existing magnesium alloys, and provide ultra-high strength and toughness magnesium alloys containing no rare earth and low alloys and preparation methods thereof

Method used

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  • Rare-earth-free low-alloy ultra-high-strength magnesium alloy and preparation method thereof

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specific Embodiment approach 1

[0018] Embodiment 1: This embodiment is a rare earth-free low-alloy ultra-high-strength magnesium alloy, which is composed of Mg and alloy elements, and the mass fraction of alloy elements is ≤ 2.5%, and the balance is Mg; the alloy elements are composed of Al, Composed of Ca and Mn, the mass fraction of Al is 0.2%-2.0%, the mass fraction of Ca is 0.2%-2.0%, and the mass fraction of Mn is 0.4%.

specific Embodiment approach 2

[0019] Specific embodiment 2: The present embodiment as described in specific embodiment 1 is a method for preparing a rare earth-free low-alloy ultra-high-strength magnesium alloy, which is specifically completed according to the following steps:

[0020] 1. Casting: using pure Mg, pure Al, Mg-Ca master alloy and Mg-Mn master alloy as raw materials, successively smelting and casting to obtain a cast alloy; the mass fraction of Al in the cast alloy is 0.2% to 2.0%, The mass fraction of Ca is 0.2%-2.0%, the mass fraction of Mn is 0.4%, the balance is Mg, and the total mass fraction of Al, Ca and Mn≤2.5%;

[0021] 2. Homogenization treatment: place the cast alloy in a resistance heating furnace for homogenization treatment, and obtain the alloy after homogenization treatment;

[0022] 3. Extrusion deformation: preheat the homogenized alloy and the extrusion die respectively to obtain the preheated alloy and the preheated extrusion die, and then put the preheated alloy into the p...

specific Embodiment approach 3

[0026] Specific implementation mode three: the difference between this implementation mode and specific implementation mode two is: in step one, in SF 6 +CO 2Under a mixed protective atmosphere, first place pure Mg in a crucible, heat up to 680-760°C, keep warm at a temperature of 680-760°C to completely melt pure Mg, and then add pure Al, Mg-Ca intermediate alloy and Mg-Mn in sequence The alloy is mechanically stirred at a temperature of 680-760°C for 15min-30min, then left to stand for 15min-30min to obtain an alloy melt, and then the alloy melt is made into an ingot by a metal mold water cooling solidification process to obtain a cast alloy. Others are the same as in the second embodiment.

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Abstract

The invention provides a rare earth-free low-alloy super-high-toughness magnesium alloy and a preparation method thereof, relates to the fields of metal materials and metal material processing, and particularly relates to a magnesium alloy and a preparation method thereof. The invention aims to solve the problem of low yield strength of the existing magnesium alloy, and to provide a rare earth-free low-alloy super-high-toughness magnesium alloy and a preparation method thereof. The low-alloy super-high-toughness magnesium alloy is prepared from Mg and alloying elements, wherein the mass fraction of the alloying elements is equal to or less than 2.5%, and the balance of Mg; the alloying elements are composed of Al, Ca and Mn, or Al, Ca, Sr and Mn. The preparation method comprises the following steps: 1, smelting and casting to obtain a cast alloy; 2, performing homogenization treatment; 3, performing extrusion deformation to obtain the rare earth-free low-alloy super-high-toughness magnesium alloy. The advantages are as follows: the yield strength at the room temperature reaches up to 334 to 430 MPa, the tensile strength reaches 356 to 440 MPa, and the ductility is 5.0% or above. The preparation method provided by the invention is mainly used for preparing the rare earth-free low-alloy super-high-toughness magnesium alloy.

Description

technical field [0001] The invention relates to the field of metal materials and metal material processing, in particular to a magnesium alloy and a preparation method thereof. Background technique [0002] Magnesium and magnesium alloys, due to their low density (about 1.74g / cm 3 , is 2 / 3 of aluminum, 1 / 4 of iron), high specific strength, abundant reserves and easy recycling, etc., and is known as "21st century green engineering material". , energy saving and emission reduction, green development and other aspects have great development prospects. [0003] After six decades of development, the application fields of magnesium alloys are still far inferior to those of aluminum alloys and steel, and the commercialization process has been greatly hindered. The main reason is that magnesium alloys still have some significant defects: ①The yield strength and tensile strength are low, It cannot meet the demand for ultra-high-strength magnesium alloys in high-tech fields; ②Low el...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/00C22C1/03C22F1/06B21C23/00
CPCB21C23/001C22C1/03C22C23/00C22F1/002C22F1/06
Inventor 郑明毅汪杰乔晓光李子彤
Owner HARBIN INST OF TECH
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