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Age-hardenable mg-zn-cr-bi-zr alloy and its preparation method

A technology of age hardening and alloying, which is applied in the field of metal material engineering, can solve the problems of inhibiting the rapid growth of age hardening phase and increasing the cost of alloys, etc., and achieve the goal of improving thermal stability and mechanical properties, increasing strength, and increasing hindering effect Effect

Active Publication Date: 2016-08-24
NORTHEASTERN UNIV LIAONING
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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, it has no effect on inhibiting the rapid growth of the age-hardening phase and prolonging the overaging of the alloy. Ideal; the addition of Nd increases the cost of the alloy

Method used

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  • Age-hardenable mg-zn-cr-bi-zr alloy and its preparation method

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 mass percentages of the alloy components are: Zn 4% to 10%, Cr 0.1% to 0.5%, Bi 0.1% to 1.0%, Zr 0.3% to 0.5%, and the balance is Mg; the method of preparing the alloy includes: preheating the prepared alloy charge, and passing in a mixed gas of CO2 / SF6 as a protective gas for smelting , the obtained Mg-Zn-Cr-Bi-Zr as-cast alloy material was diffusion annealed at 380°C for 48 hours, and then wire-cut to obtain samples for aging heat treatment and plate-shaped tensile samples. The above samples were solid-solved, and then Aging at 160°C for 0 to 400 hours can be obtained. The invention can prepare Mg-Zn-Cr-Bi-Zr cast magnesium alloy with relatively fine as-cast structure, good age hardening effect, thermal stability and mechanical properties, and low cost.

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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Patent Type & Authority Patents(China)
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 LIAONING
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