Age hardenable Mg-Zn-Cr-Bi-Zr alloy and preparation method thereof

An age-hardening and alloying technology, which is applied in the field of metal material engineering, can solve the problems of increasing the cost of the alloy and inhibiting the rapid growth of the age-hardening phase, so as to increase the strength, improve the thermal stability and mechanical properties, and improve the uniformity of the structure Effect

Active Publication Date: 2015-01-21
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The above method also has problems: although adding Cu and Zr to the Mg-Zn alloy can increase the precipitation amount of the age-hardening phase and refine the structure

Method used

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  • Age hardenable Mg-Zn-Cr-Bi-Zr alloy and preparation method thereof
  • Age hardenable Mg-Zn-Cr-Bi-Zr alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] An age-hardenable Mg-Zn-Cr-Bi-Zr alloy, its components and mass percentages are: Zn: 5.5%, Cr: 0.2%, Bi: 0.5%, Zr: 0.3%, and the balance is Mg , 100% total mass.

[0035] Its preparation method is as follows:

[0036] 1. Calculated based on the mass percentage of the melt, take by weighing 94% of magnesium ingot (purity is 99.9%), zinc ingot (purity is 99.9%) 6%, metal Cr (purity is 99.9%) 0.21%, metal Bi (purity is 99.9%) %) 0.55%, Mg-Zr master alloy MgZr30 (containing 30% Zr) 1.05%;

[0037] 2. Put the weighed metal charge into the crucible resistance furnace after preheating and baking at 200°C;

[0038] 3. Set the heating temperature of the crucible resistance furnace to 760°C. When the temperature of the crucible rises to 400°C, first add magnesium ingots, zinc ingots, metal Cr and MgZr30 intermediate alloys into the crucible, and feed 0.1% SF 6 -99.9% CO 2 The mixed gas is used as the protective gas; continue to heat up, after the magnesium ingot, zinc ingot, ...

Embodiment 2

[0045] An age-hardenable Mg-Zn-Cr-Bi-Zr alloy, its components and mass percentages are: Zn: 5.5%, Cr: 0.2%, Bi: 0.8%, Zr: 0.3%, and the balance is Mg , 100% total mass.

[0046] Its preparation method is as follows:

[0047] 1. Calculated based on the mass percentage of the melt, take by weighing 94% of magnesium ingot (purity is 99.9%), zinc ingot (purity is 99.9%) 6%, metal Cr (purity is 99.9%) 0.21%, metal Bi (purity is 99.9%) %) 0.9%, MgZr30 master alloy 1.05%;

[0048] 2. Put the weighed metal charge into the crucible resistance furnace after preheating and baking at 200°C;

[0049] 3. Set the heating temperature of the crucible resistance furnace to 740°C. When the temperature of the crucible rises to 350°C, first add magnesium ingots, zinc ingots, metal Cr and MgZr30 intermediate alloys into the crucible, and feed 0.1% SF 6 -99.9% CO 2 The mixed gas is used as a protective gas; continue to heat up, after the magnesium ingot, zinc ingot, metal Cr and MgZr30 intermedi...

Embodiment 3

[0054] An age-hardenable Mg-Zn-Cr-Bi-Zr alloy, its components and mass percentages are: Zn: 8%, Cr: 0.2%, Bi: 0.5%, Zr: 0.3%, and the balance is Mg , 100% total mass.

[0055] Its preparation method is as follows:

[0056] 1. Based on the melt mass percentage, take by weighing 91% of magnesium ingot (purity is 99.9%), zinc ingot (purity is 99.9%) 9%, metal Cr (purity is 99.9%) 0.21%, metal Bi (purity is 99.9%) %) 0.55%, MgZr30 master alloy 1.05%;

[0057] 2. Put the weighed metal charge into the crucible resistance furnace after preheating and baking at 200°C;

[0058] 3. Set the heating temperature of the crucible resistance furnace to 750°C. When the temperature of the crucible rises to 380°C, first add magnesium ingots, zinc ingots, metal Cr and MgZr30 intermediate alloys to the crucible, and then pass in CO 2 / SF 6 The mixed gas is used as the protective gas; continue to heat up, after the magnesium ingot, zinc ingot, metal Cr and MgZr30 intermediate alloy in the cruci...

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Abstract

The invention discloses an age hardenable Mg-Zn-Cr-Bi-Zr alloy and a preparation method thereof. The alloy comprises the following components in percentage by mass: 4-10% of Zn, 0.1-0.5% of Cr, 0.1-1.0% of Bi, 0.3-0.5% of Zr, and the balance of Mg. The preparation method of the alloy comprises the following steps: preheating a prepared alloy burden, feeding CO2/SF6 mixed gas as a shielding gas for smelting, and carrying out diffusion annealing on the obtained Mg-Zn-Cr-Bi-Zr as-cast alloy material for 48 h at a temperature of 380 DEG C; carrying out wire cutting on the obtained object, so that a sample for aging heat treatment and a platy tensile sample are obtained; carrying out solid dissolving on the samples; and aging the obtained product for 0-400 hours at a temperature of 160 DEG C, so that the age hardenable Mg-Zn-Cr-Bi-Zr alloy is obtained. According to the invention, a Mg-Zn-Cr-Bi-Zr alloy which has a relatively thin as-cast structure and is good in age hardening effect, thermal stability and mechanical properties and low in cost can be prepared.

Description

technical field [0001] The invention relates to an age-hardenable Mg-Zn-Cr-Bi-Zr alloy and a preparation method thereof, belonging to the technical field of metal material engineering. Background technique [0002] Magnesium alloy is currently the lightest metal structural material in practical application. It has excellent specific strength, specific stiffness, shock absorption, thermal conductivity, machinability and recyclability, and has become the most promising metal material. Known as the "green engineering material" of the 21st century, it has been valued by many countries. However, due to the low strength and poor plasticity of magnesium alloys, its further application in industry is limited. Therefore, improving the mechanical properties of magnesium alloys is the focus of research and development in the field of magnesium alloy technology. [0003] Mg-Zn alloys are an important basis for practical magnesium alloys. There are metastable solubility gaps in their s...

Claims

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Application Information

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IPC IPC(8): C22C23/04C22F1/06
CPCC22C1/03C22C23/04C22F1/06
Inventor 叶杰林小娉董允杨会光樊志斌付守军吴厚卜尹世攀
Owner NORTHEASTERN UNIV
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