CN103849799A - High-toughness deformed Mg-Zn-Nd-Zr magnesium alloy and preparation method thereof - Google Patents
High-toughness deformed Mg-Zn-Nd-Zr magnesium alloy and preparation method thereof Download PDFInfo
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- CN103849799A CN103849799A CN201210496119.3A CN201210496119A CN103849799A CN 103849799 A CN103849799 A CN 103849799A CN 201210496119 A CN201210496119 A CN 201210496119A CN 103849799 A CN103849799 A CN 103849799A
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Abstract
The invention relates to a high-toughness deformed Mg-Zn-Nd-Zr magnesium alloy, which is characterized in that industrial pure magnesium and industrial pure zinc are taken as a raw material to obtain an Mg-Zn alloy melt, and a proper amount of Nd and Zr are added into the Mg-Zn alloy melt in a Mg-Nd and Mg-Zr intermediate alloy way. A preparation method comprises the following steps: preheating industrial pure magnesium and industrial pure zinc to the temperature of 100-200 DEG C, and fusing in a crucible electric resistance furnace protected by SF6/CO2 gas, respectively adding the Mg-Nd and Mg-Zr intermediate alloy in the Mg-Zn alloy melt when the melt temperature reaches 680 DEG C, stirring an alloy liquid during a melting process to ensure the uniform distribution of the alloy element; completely fusing the solid material, standing the alloy melt for 10 minutes, casting in a metal mold; preheating a magnesium alloy ingot casting to the temperature of 350 DEG C, preheating an extrusion die to the temperature of 350 DEG C, and using a metal extruder for extruding the magnesium alloy ingot casting to form bar materials.
Description
Technical field
The present invention relates to a kind of Magnuminium and preparation method thereof, particularly a kind of automobile and field of aerospace adopt plastic molding method to manufacture high tenacity distortion Mg-Zn-Nd-Zr magnesium alloy of dependency structure part and preparation method thereof.
Background technology
Magnesium alloy is low owing to having density, the advantages such as specific tenacity and specific rigidity height, thereby be widely used in automobile and field of aerospace.But, because magnesium alloy is close-packed hexagonal structure, be a structural metallic materials that quasi-plastic property deformability is low, pressure machining characteristics is poor, therefore magnesium alloy structural part is to adopt castmethod to be shaped mostly.
Compared with cast magnesium alloys, wrought magnesium alloys has higher intensity, better plasticity and more diversified specification, has great advantage widening aspect the Application Areas of magnesium alloy materials.Current commercial applications the most widely deformed magnesium alloy material mainly contains ZK60 (δ=9～14%, σ
b=304MPa, σ
0.2=236MPa), AZ31 (δ=14～17%, σ
b=260MPa, σ
0.2=195～200MPa.)、WE43(δ＝6～8％，σ
b＝238MPa，σ
0.2＝131MPa。) etc., but the toughness of these alloys is on the low side, is difficult to adopt forging equipressure complete processing to carry out the manufacture of complex structural member or load-bearing structural member.
Summary of the invention
The object of the invention is to solve prior art above shortcomings, for the deficiency of existing commercialization wrought magnesium alloys forming property, provide a kind of novel high tenacity wrought magnesium alloys and preparation method thereof.Add rear earth element nd (Nd) by being associated at Mg-Zn-Zr on golden basis, improve the toughness of alloy, and in conjunction with the ageing treatment after extruding, further put forward heavy alloyed intensity, to meet better the demand of above-mentioned industrial circle.
The technical scheme that the present invention provides is:
This high tenacity distortion Mg-Zn-Nd-Zr magnesium alloy, be characterized in obtaining Mg-Zn alloy melt take pure magnesium and industrial-purity zinc as starting material, and add wherein appropriate Nd and Zr with the form of Mg-Nd and Mg-Zr master alloy, the chemical composition of alloy is (weight percent):
The manufacture method of this high tenacity distortion Mg-Zn-Nd-Zr magnesium alloy is:
Pure magnesium and industrial-purity zinc are preheating to 100～200 ℃ and having SF
6/ CO
2in the crucible electrical resistance furnace of gas shield, melt, in the time that melt temperature reaches 680 ℃, more respectively Mg-Nd and Mg-Zr master alloy are added in Mg-Zn alloy melt, in fusion process, stir aluminium alloy, to guarantee being uniformly distributed of alloying element; After solid material all melts, alloy melt is left standstill to 10 minutes, then pour in metal die;
Magnesium alloy ingot is preheated to 350 ℃, extrusion mould is preheated to 350 ℃, utilize metal extrusion press that magnesium alloy ingot is squeezed into bar, corresponding extrusion temperature is 370～390 ℃, and extruding rate is 0.5m/min, and extrusion ratio is 17.5: 1.
Compared with prior art, the invention has the beneficial effects as follows:
The Mg-Zn-Nd-Zr series deformation magnesium alloy that uses the inventive method to produce, in obtaining high tenacity, also guarantee that alloy has higher tensile strength and yield strength, feature of the present invention:
(1), owing to having selected rare earth element nd, in realizing microalloying, can obtain best malleableize effect, and can reduce to greatest extent the impurity producing due to alloying and be mingled with;
(2) because the form that adopts Mg-Nd and Mg-Zr master alloy adds Nd and Zr element, guarantee the accurate control of alloying constituent, made preparation technology's highly versatile of this alloy, simple to operate.
Embodiment
Embodiment 1
According to the proportioning of mass percent Zn4%, Nd0.8%, Zr0.5%, Mg surplus, pure magnesium and industrial-purity zinc are preheating to 100～200 ℃, and are having SF
6/ CO
2in the crucible electrical resistance furnace of gas shield, melt, in the time that melt temperature reaches 680 ℃, more respectively Mg-Nd and Mg-Zr master alloy are added in Mg-Zn alloy melt, in fusion process, stir aluminium alloy, to guarantee being uniformly distributed of alloying element; After solid material all melts, alloy melt is left standstill to 10 minutes, then pour in metal die;
Magnesium alloy ingot is preheated to 350 ℃, extrusion mould is preheated to 350 ℃, utilize metal extrusion press that magnesium alloy ingot is squeezed into bar, corresponding extrusion temperature is 370～390 ℃, and extruding rate is 0.5m/min, and extrusion ratio is 17.5: 1.
Adopt the room temperature tensile performance of the bar obtaining after above-mentioned technique extruding to be: elongation at break δ=22.6%, tensile strength sigma
b=264.9MPa, yield strength σ
0.2=177.1MPa.
Embodiment 2
According to the proportioning of mass percent Zn4.2%, Nd1%, Zr0.4%, Mg surplus, pure magnesium and industrial-purity zinc are preheating to 100～200 ℃, and are having SF
6/ CO
2in the crucible electrical resistance furnace of gas shield, melt, in the time that melt temperature reaches 680 ℃, more respectively Mg-Nd and Mg-Zr master alloy are added in Mg-Zn alloy melt, in fusion process, stir aluminium alloy, to guarantee being uniformly distributed of alloying element; After solid material all melts, alloy melt is left standstill to 10 minutes, then pour in metal die;
Magnesium alloy ingot is preheated to 350 ℃, extrusion mould is preheated to 350 ℃, utilize metal extrusion press that magnesium alloy ingot is squeezed into bar, corresponding extrusion temperature is 370～390 ℃, and extruding rate is 0.5m/min, and extrusion ratio is 17.5: 1.
Adopt the room temperature tensile performance of the bar obtaining after above-mentioned technique extruding to be: elongation at break δ=21.8%, tensile strength sigma
b=263.1MPa, yield strength σ
0.2=174.6MPa.
Embodiment 3
According to the proportioning of mass percent Zn3.8%, Nd1.2%, Zr0.5%, Mg surplus, pure magnesium and industrial-purity zinc are preheating to 100～200 ℃, and are having SF
6/ CO
2in the crucible electrical resistance furnace of gas shield, melt, in the time that melt temperature reaches 680 ℃, more respectively Mg-Nd and Mg-Zr master alloy are added in Mg-Zn alloy melt, in fusion process, stir aluminium alloy, to guarantee being uniformly distributed of alloying element; After solid material all melts, alloy melt is left standstill to 10 minutes, then pour in metal die;
Magnesium alloy ingot is preheated to 350 ℃, extrusion mould is preheated to 350 ℃, utilize metal extrusion press that magnesium alloy ingot is squeezed into bar, corresponding extrusion temperature is 370～390 ℃, and extruding rate is 0.5m/min, and extrusion ratio is 17.5: 1.
Adopt the room temperature tensile performance of the bar obtaining after above-mentioned technique extruding to be: elongation at break δ=22.3%, tensile strength sigma
b=265.1MPa, yield strength σ
0.
2=178.3MPa.
Embodiment 4
According to the proportioning of mass percent Zn4%, Nd1%, Zr0.6%, Mg surplus, pure magnesium and industrial-purity zinc are preheating to 100～200 ℃, and are having SF
6/ CO
2in the crucible electrical resistance furnace of gas shield, melt, in the time that melt temperature reaches 680 ℃, more respectively Mg-Nd and Mg-Zr master alloy are added in Mg-Zn alloy melt, in fusion process, stir aluminium alloy, to guarantee being uniformly distributed of alloying element; After solid material all melts, alloy melt is left standstill to 10 minutes, then pour in metal die;
Magnesium alloy ingot is preheated to 350 ℃, extrusion mould is preheated to 350 ℃, utilize metal extrusion press that magnesium alloy ingot is squeezed into bar, corresponding extrusion temperature is 370～390 ℃, and extruding rate is 0.5m/min, and extrusion ratio is 17.5: 1.
Adopt after above-mentioned technique extruding, then alloy carries out the follow-up ageing treatment of 175 ℃ × 10 hours.After ageing treatment, the room temperature tensile performance of alloy is: elongation at break δ=24.8%, tensile strength sigma
b=281.7MPa, yield strength σ
0.
2=194.9MPa.
Claims (6)
1. a high tenacity distortion Mg-Zn-Nd-Zr magnesium alloy, it is characterized in that obtaining Mg-Zn alloy melt take pure magnesium and industrial-purity zinc as starting material, and add wherein appropriate Nd and Zr with the form of Mg-Nd and Mg-Zr master alloy, the chemical composition of alloy is (weight percent):
2. a kind of high tenacity distortion Mg-Zn-Nd-Zr magnesium alloy according to claim 1, the chemical composition that it is characterized in that alloy is (weight percent):
Zn4%, Nd0.8%, Zr0.5%, Mg surplus.
3. a kind of high tenacity distortion Mg-Zn-Nd-Zr magnesium alloy according to claim 1, the chemical composition that it is characterized in that alloy is (weight percent):
Zn4.2%, Nd1%, Zr0.4%, Mg surplus.
4. a kind of high tenacity distortion Mg-Zn-Nd-Zr magnesium alloy according to claim 1, the chemical composition that it is characterized in that alloy is (weight percent):
Zn3.8%, Nd1.2%, Zr0.5%, Mg surplus.
5. a kind of high tenacity distortion Mg-Zn-Nd-Zr magnesium alloy according to claim 1, the chemical composition that it is characterized in that alloy is (weight percent):
Zn4%, Nd1%, Zr0.6%, Mg surplus.
6. a manufacture method for high tenacity distortion Mg-Zn-Nd-Zr magnesium alloy, is characterized in that:
Pure magnesium and industrial-purity zinc are preheating to 100～200 ℃ and having SF
6/ CO
2in the crucible electrical resistance furnace of gas shield, melt, in the time that melt temperature reaches 680 ℃, more respectively Mg-Nd and Mg-Zr master alloy are added in Mg-Zn alloy melt, in fusion process, stir aluminium alloy, to guarantee being uniformly distributed of alloying element; After solid material all melts, alloy melt is left standstill to 10 minutes, then pour in metal die;
Magnesium alloy ingot is preheated to 350 ℃, extrusion mould is preheated to 350 ℃, utilize metal extrusion press that magnesium alloy ingot is squeezed into bar, corresponding extrusion temperature is 370～390 ℃, and extruding rate is 0.5m/min, and extrusion ratio is 17.5: 1.
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| CN201210496119.3A CN103849799A (en) | 2012-11-28 | 2012-11-28 | High-toughness deformed Mg-Zn-Nd-Zr magnesium alloy and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104498791A (en) * | 2014-12-15 | 2015-04-08 | 苏州昊卓新材料有限公司 | Method for preparing high-strength magnesium alloy |
| CN113802039A (en) * | 2021-09-26 | 2021-12-17 | 太原理工大学 | Preparation method of microalloyed ultrahigh-strength magnesium alloy |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06293944A (en) * | 1993-04-06 | 1994-10-21 | Nippon Steel Corp | Production of magnesium alloy sheet excellent in press formability |
| JPH07126790A (en) * | 1993-10-29 | 1995-05-16 | Kobe Steel Ltd | Highly corrosion resistant mg-base alloy |
| CN1587430A (en) * | 2004-08-12 | 2005-03-02 | 上海交通大学 | Deformed magnesium alloy and its casting and deforming processing process |
| JP2006089772A (en) * | 2004-09-21 | 2006-04-06 | Toyota Motor Corp | Magnesium alloy |
| CN101407880A (en) * | 2008-11-17 | 2009-04-15 | 江苏科技大学 | Mg-Zn-Zr-Nd magnesium alloy and preparation thereof |
-
2012
- 2012-11-28 CN CN201210496119.3A patent/CN103849799A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06293944A (en) * | 1993-04-06 | 1994-10-21 | Nippon Steel Corp | Production of magnesium alloy sheet excellent in press formability |
| JPH07126790A (en) * | 1993-10-29 | 1995-05-16 | Kobe Steel Ltd | Highly corrosion resistant mg-base alloy |
| CN1587430A (en) * | 2004-08-12 | 2005-03-02 | 上海交通大学 | Deformed magnesium alloy and its casting and deforming processing process |
| JP2006089772A (en) * | 2004-09-21 | 2006-04-06 | Toyota Motor Corp | Magnesium alloy |
| CN101407880A (en) * | 2008-11-17 | 2009-04-15 | 江苏科技大学 | Mg-Zn-Zr-Nd magnesium alloy and preparation thereof |
Non-Patent Citations (1)
| Title |
|---|
| 杨林等: "Microstructural evolution of rolled Mg-5Zn-3Nd(-Zr) alloy", 《TRANS. NONFERROUS MET. SOC. CHINA》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104498791A (en) * | 2014-12-15 | 2015-04-08 | 苏州昊卓新材料有限公司 | Method for preparing high-strength magnesium alloy |
| CN113802039A (en) * | 2021-09-26 | 2021-12-17 | 太原理工大学 | Preparation method of microalloyed ultrahigh-strength magnesium alloy |
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