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Magnesium, zinc, aluminum, chromium, bismuth and calcium alloy allowing age hardening and preparation method thereof

An age-hardening and alloying technology, which is applied in the field of metal material engineering, can solve problems such as low hardness and poor plasticity and toughness of alloys, and achieve the effect of increasing yield limit and heat resistance

Active Publication Date: 2014-12-24
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, this type of alloy has the following disadvantages: Mg 32 (Al, Zn) 49 As the main strengthening phase, it is mostly distributed on the grain boundary in the form of a network, and the room temperature plasticity and toughness of the alloy are poor, and the hardness is also relatively low

Method used

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  • Magnesium, zinc, aluminum, chromium, bismuth and calcium alloy allowing age hardening and preparation method thereof
  • Magnesium, zinc, aluminum, chromium, bismuth and calcium alloy allowing age hardening and preparation method thereof
  • Magnesium, zinc, aluminum, chromium, bismuth and calcium alloy allowing age hardening and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] An age-hardenable Mg-Zn-Cr-Bi-Zr alloy, its components and mass percentages are: Zn7.85%, Al4.02%, Cr0.20%, Ca1.05%, Bi0.8% , the balance is Mg, and the total mass is 100%.

[0044] Its preparation method is as follows:

[0045] 1. Calculated based on the mass percentage of the melt, and considering the burning loss rate of alloying elements during the smelting process, weigh 87% of pure magnesium ingot (purity is 99.9%), zinc ingot (purity is 99.9%) 8.5%, aluminum ingot ( Purity is 99.9%) 4.5%, pure metal Cr (purity is 99.9%) 0.21%, pure metal Bi (purity is 99.9%) 0.9% and pure metal Ca (purity is 99.9%) 1.2%;

[0046] 2. Put the raw materials into SX3-2.5-12 crucible resistance furnace after preheating and baking at 200°C;

[0047] 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, aluminum ingots and metal Cr to the crucible, and start feeding 0.1%...

Embodiment 2

[0051] An age-hardenable Mg-Zn-Cr-Bi-Zr alloy, its components and mass percentages are: Zn4%, Al2%, Cr0.1%, Ca0.5%, Bi0.1%, and the balance is Mg, total mass 100%.

[0052] Its preparation method is as follows:

[0053] 1. Calculated based on the mass percentage of the melt, and considering the burning loss rate of alloy elements in the smelting process, weigh 93% of pure magnesium ingot (purity is 99.9%), 4.5% of zinc ingot (purity is 99.9%), aluminum ingot ( Purity is 99.9%) 2.5%, pure metal Cr (purity is 99.9%) 0.11%, pure metal Bi (purity is 99.9%) 0.15% and pure metal Ca (purity is 99.9%) 0.6%;

[0054] 2. Put the raw materials into SX3-2.5-12 crucible resistance furnace after preheating and baking at 200°C;

[0055] 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, aluminum ingots and metal Cr to the crucible, and start feeding 0.1% SF 6 -99.9% CO 2...

Embodiment 3

[0059] An age-hardenable Mg-Zn-Cr-Bi-Zr alloy, its components and mass percentages are: Zn10%, Al6%, Cr0.5%, Ca2%, Bi1%, the balance is Mg, the total mass 100%.

[0060] Its preparation method is as follows:

[0061] 1. Calculated on the basis of the mass percentage of the melt, and considering the burning loss rate of alloying elements during the smelting process, weigh 82.5% of magnesium ingot (purity is 99.9%), zinc ingot (purity of 99.9%) 11%, aluminum ingot (purity 99.9%) 6.5%, metal Cr (purity 99.9%) 0.52%, metal Bi (purity 99.9%) 1.1% and metal Ca (purity 99.9%) 2.2%;

[0062] 2. Put the raw materials into the crucible resistance furnace after preheating and baking at 200°C;

[0063] 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, aluminum ingots and metal Cr to the crucible, and start feeding 0.1% SF 6 -99.9% CO 2 (volume fraction) mixed gas as ...

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Abstract

The invention discloses a magnesium, zinc, aluminum, chromium, bismuth and calcium alloy allowing age hardening and a preparation method thereof. Mass percent of components of the alloy is that 4 to 10% of zinc, 2 to 4% of aluminum, 0.1 to 0.5% of chromium, 0.1 to 1.0% of bismuth, 0.5 to 2.0% of calcium, the remaining is magnesium, and the total mass is 100%. The preparation method of the alloy comprises the following steps of preheating prepared alloy furnace materials, communicating a carbon dioxide and sulfur hexafluoride mixed gas to be served as a protection gas to perform smelting, performing diffusion annealing on obtained magnesium, zinc, aluminum, chromium, bismuth and calcium as-cast-condition alloy materials for 48 hours under 380 degrees, performing linear cutting to obtain aging thermal treatment samples and plate-shaped tensile samples, preserving heat of the above samples, performing water quenching and manual aging to obtain the magnesium, zinc, aluminum, chromium, bismuth and calcium alloy allowing age hardening. The preparation method can obtain preparation the magnesium, zinc, aluminum, chromium, bismuth and calcium alloy allowing age hardening and relatively thin in as-cast structure and high in thermal stability and mechanical property.

Description

technical field [0001] The invention relates to an age-hardenable Mg-Zn-Al-Cr-Bi-Ca alloy and a preparation method thereof, belonging to the technical field of metal material engineering. Background technique [0002] In order to meet the requirements of automobile lightweight and expand the application of magnesium alloys in automobiles, the research and development of high-strength heat-resistant magnesium alloys has become an inevitable development trend, which creates rare opportunities and challenges for the development of magnesium alloys. Ascertaining the microcosmic mechanism of strengthening and toughening magnesium alloys, and developing new high-strength and tough magnesium alloys and heat-resistant magnesium alloys with high performance and low cost have become one of the focuses of materials science and industry in recent years. The ZA series magnesium alloy is a magnesium alloy that has been studied more actively in recent years, and its main strengthening phas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/02C22C23/04C22C1/02
Inventor 叶杰林小娉董允樊志斌杨会光刘宁宁付守军关策罗晶
Owner NORTHEASTERN UNIV LIAONING
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