CN104099507A - High-strength and high-toughness rare earth magnesium alloy - Google Patents

High-strength and high-toughness rare earth magnesium alloy Download PDF

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Publication number
CN104099507A
CN104099507A CN201410334746.6A CN201410334746A CN104099507A CN 104099507 A CN104099507 A CN 104099507A CN 201410334746 A CN201410334746 A CN 201410334746A CN 104099507 A CN104099507 A CN 104099507A
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China
Prior art keywords
alloy
rare earth
strength
magnesium alloy
earth magnesium
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CN201410334746.6A
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Chinese (zh)
Inventor
张思倩
陈立佳
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Shenyang University of Technology
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Shenyang University of Technology
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Priority to CN201410334746.6A priority Critical patent/CN104099507A/en
Publication of CN104099507A publication Critical patent/CN104099507A/en
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Abstract

The invention provides a high-strength and high-toughness rare earth magnesium alloy. The alloy comprises the following components in percentage by mass: 7.0-12.0% of Zn, 0.5-1.9% of Zr, 0.3-1.0% of Y, 0.1-0.5% of Nd, 0.05-0.1% of Ce, with the balance being Mg. The alloy not only has the characteristics of high strength and high toughness, but also has higher mechanical property, oxidation resistance and excellent structure stability. The alloy is specifically suitable for the field of automobile industry.

Description

High strength, high-ductility rare earth magnesium alloy
Technical field
The invention belongs to magnesium-rare earth technical field, be specifically related to mainly be applicable to automobile component.
Background technology
Magnesium and magnesium alloy are the lightest current structural metallic materials, have high specific tenacity and specific rigidity, good diamagnetism, high electronegativity and thermal conductivity, good shock absorbing and machinability.But the intensity of magnesium alloy is not high, and particularly high-temperature behavior is poor, greatly limited its application.So improving room temperature strength and the hot strength of magnesium alloy is the matter of utmost importance that will solve in magnesium alloy research.
Summary of the invention
Goal of the invention: the invention provides a kind of high strength, high-ductility rare earth magnesium alloy, its objective is and solve that the intensity of magnesium alloy is in the past low, high tenacity is poor and the problem such as poor fatigue properties
Technical scheme:
High strength, a high-ductility rare earth magnesium alloy, is characterized in that: described alloy consists of the composition of following quality percentage composition:
Zn:7.0~12.0%, Zr:0.5~1.9%, Y:0.3~1.0%, Nd:0.1~0.5%, Ce:0.05~0.1%, all the other are Mg.
2, high strength according to claim 1, high-ductility rare earth magnesium alloy, is characterized in that:
Zn:7.0~11.0%, Zr:0.5~1.8%, Y:0.3~0.9%, Nd:0.1~0.3%, Ce:0.05~0.08%, all the other are Mg.
In described magnesium-rare earth, the composition of impurity and quality percentage composition meet following requirement: O≤0.002, N≤0.001, S≤0.004.
Prepare above-mentioned high strength, the method for high-ductility rare earth magnesium alloy, it is characterized in that: concrete grammar is as follows: get in proportion each component, adopt resistance furnace melting, the crucible that raw material is housed is put into the resistance furnace that is warming up in advance 680 ℃, passing into protection gas is N2+0.1%SF6, when temperature rises to after 680 ℃ again, is incubated 20 minutes, until Mg and Zn, all after fusing, add again the master alloy containing Zr, Y, Nd and Ce, avoid oxidation; Pour into after the satisfactory mother alloy of chemical composition, then be squeezed into bar by extrusion machine, extrusion temperature is 300~320 ℃, and extrusion ratio is about 47.5, before using, must process through T5, at 180 ℃, carries out artificial aging, air cooling after insulation 24h.
Advantageous effect: the invention provides a kind of high strength, high-ductility rare earth magnesium alloy, this alloy, when obtaining high strength, high tenacity, has the good feature of fatigue property.
The atomic size radius of most of rare earth element and magnesium differs in ± 15% scope, has larger solid solubility in magnesium, has good solution strengthening, precipitation strength effect; Can effectively improve alloy structure and microtexture, raising Alloy At Room Temperature and mechanical behavior under high temperature, enhancing alloy corrosion resistance and thermotolerance etc.; Rare earth element atomic diffusion ability, has remarkable effect to improving magnesium alloy recrystallization temperature and slowing down recrystallization process; Rare earth element also has good ageing strengthening effect, can separate out highly stable disperse phase particle, thereby can increase substantially hot strength and the creep resistance of magnesium alloy.Therefore in magnesium alloy field, develop a series of magnesium alloy containing rare earth, make them there is the performances such as high-strength, heat-resisting, anti-corrosion, will effectively expand the Application Areas of magnesium alloy
The chemical composition design of alloy of the present invention is mainly based on following reason:
In Mg, add after Zn element, can play solution strengthening and precipitation strength effect.Zn can improve creep resistance and the safe range of stress of foundry goods.Due to the existence of metastable transition phase, Mg-Zn is associated gold and in ag(e)ing process, often presents good precipitation strength effect.Due to Mg-Zn be alloy grain conventionally comparatively thick time also than being easier to form the casting flaws such as micropore and cavity, therefore this is associated in gold, often add Zr with the microstructure of refinement alloy.The interpolation of Zr has become the conventional means of Refining Mg Alloy tissue.
At magnesium alloy, add a small amount of Y element can significantly improve the intensity of alloy, and its strengthening effect is even higher than Al, Mn element.Add appropriate Y element, can play the crystal boundary that narrows, the effect of crystal grain thinning.When Y content is 0.3~1.0%, the tensile strength of Mg-Zn-Zr alloy significantly improves, and elongation reaches peak value.
The solid solubility of element Nd in Mg is larger, is about 4%, so the ageing strengthening effect of the magnesium-rare earth of interpolation Nd is better.Nd can improve room temperature strength and the hot strength of magnesium alloy, so rare earth element nd becomes one of master alloying rare earth element of action effect the best.
The interpolation of appropriate Ce element can be carried heavy alloyed intensity, hardness and elongation.Ce can significantly reduce the grain-size of alloy, and can effectively put forward heavy alloyed tensile strength and yield strength.
In a word, add mishmetal and can cause pushing the formation of texture and tiny microtexture, thereby also can carry heavy alloyed intensity, hardness and elongation.
Magnesium-rare earth of the present invention utilizes pure Mg, Zn, Zr, Y, Nd, the melting in resistance furnace of Ce element, and pours into the satisfactory mother alloy of chemical composition, and then is squeezed into bar by extrusion machine.Before use, need through Overheating Treatment.
In sum, concrete advantage of the present invention and beneficial effect are as follows:
(1) compare with existing other magnesium alloy, alloy of the present invention has high strength, high tenacity feature.
(2) fatigue property of alloy of the present invention is more excellent than the alloy that does not add rare earth element.
Accompanying drawing explanation
Fig. 1 is the microstructure of alloy of the present invention after hot extrusion;
Fig. 2 is alloy of the present invention and does not add the S-N curve of rare earth Mg-Zn-Zr alloy after hot extrusion.
Embodiment
Following examples will be further described the present invention, but not thereby limiting the invention.
Concrete preparation method requires: adopts resistance furnace melting, first pours into the satisfactory mother alloy of chemical composition, and then be squeezed into bar by extrusion machine, and must be through Overheating Treatment before use.
Embodiment 1:
The chemical composition of magnesium-rare earth sample of the present invention is all referring to table 1.
The chemical composition of table 1 alloy of the present invention forms list (wt.%)
Alloy Zn Zr Y Nd Ce Mg
Embodiment 1 7.5 0.8 0.3 0.3 0.08 More than
Embodiment 2 8 0.6 0.5 0.4 0.06 More than
Embodiment 3 8.2 0.7 0.6 0.3 0.05 More than
Embodiment 4 7.8 0.5 0.4 0.5 0.08 More than
Embodiment 5 7.0 0.8 1.0 0.1 0.05 More than
Embodiment 6 12 0.5 0.5 0.4 0.1 More than
Embodiment 7 11 1.9 0.6 0.3 0.08 More than
Embodiment 8 7.2 1.8 0.9 0.5 0.06 More than
Note: in table, " remaining " implication on Mg content one hurdle is " surplus ".In described magnesium-rare earth, the composition of impurity and quality percentage composition meet following requirement: O≤0.002, N≤0.001, S≤0.004.
Microstructure after alloy hot extrusion of the present invention is shown in Fig. 1.
The mechanical property of the alloy of the embodiment of the present invention sees the following form.
Embodiment 1
Embodiment 2
The mechanical property of alloy of the present invention
Embodiment 3
The mechanical property of alloy of the present invention
Embodiment 4
The mechanical property of alloy of the present invention
Embodiment 5
The mechanical property of alloy of the present invention
Embodiment 6
The mechanical property of alloy of the present invention
Embodiment 7
The mechanical property of alloy of the present invention
Embodiment 8
The mechanical property of alloy of the present invention
After alloy hot extrusion of the present invention, and do not add rare earth alloy low cycle fatigue property relatively see Fig. 2.

Claims (4)

1. high strength, a high-ductility rare earth magnesium alloy, is characterized in that: described alloy consists of the composition of following quality percentage composition:
Zn:7.0~12.0%, Zr:0.5~1.9%, Y:0.3~1.0%, Nd:0.1~0.5%, Ce:0.05~0.1%, all the other are Mg.
2. high strength according to claim 1, high-ductility rare earth magnesium alloy, is characterized in that:
Zn:7.0~11.0%, Zr:0.5~1.8%, Y:0.3~0.9%, Nd:0.1~0.3%, Ce:0.05~0.08%, all the other are Mg.
3. high strength according to claim 1 and 2, high-ductility rare earth magnesium alloy, is characterized in that: in described magnesium-rare earth, the composition of impurity and quality percentage composition meet following requirement: O≤0.002, N≤0.001, S≤0.004.
4. prepare the method for high strength claimed in claim 1, high-ductility rare earth magnesium alloy, it is characterized in that: concrete grammar is as follows: get in proportion each component, adopt resistance furnace melting, the crucible that raw material is housed is put into the resistance furnace that is warming up in advance 680 ℃, passing into protection gas is N2+0.1%SF6, when temperature rises to after 680 ℃ again, is incubated 20 minutes, until Mg and Zn, all after fusing, add again the master alloy containing Zr, Y, Nd and Ce, avoid oxidation; Pour into after the satisfactory mother alloy of chemical composition, then be squeezed into bar by extrusion machine, extrusion temperature is 300~320 ℃, and extrusion ratio is about 47.5, before using, must process through T5, at 180 ℃, carries out artificial aging, air cooling after insulation 24h.
CN201410334746.6A 2014-07-14 2014-07-14 High-strength and high-toughness rare earth magnesium alloy Pending CN104099507A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105420577A (en) * 2015-12-25 2016-03-23 嘉瑞科技(惠州)有限公司 High-strength magnesium alloy and preparation method thereof
CN107190189A (en) * 2017-05-19 2017-09-22 宝鸡市金得利新材料有限公司 A kind of magnesium alloy for having mechanics and corrosion resistance concurrently and preparation method thereof

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Publication number Priority date Publication date Assignee Title
CN1616697A (en) * 2004-11-11 2005-05-18 重庆大学 High plasticity magnesium alloy containing rare-earth yttrium
CN1789458A (en) * 2005-12-12 2006-06-21 西安理工大学 In-situ synthesizing quasi-crystal and approximate phase reinforced high-strength ultra-tough magnesium alloy and preparation method thereof
CN101050500A (en) * 2007-05-09 2007-10-10 南京云海特种金属股份有限公司 Wrought magnesium alloys in high intensity, high plasticity, and preparation method
CN101787472A (en) * 2010-03-18 2010-07-28 上海交通大学 Heat-resistant forged magnesium-rare earth alloy and preparation method thereof
EP2395119A1 (en) * 2010-05-21 2011-12-14 Helmholtz-Zentrum Geesthacht Zentrum für Material- und Küstenforschung GmbH Method for shaping a magnesium-based alloy by means of extrusion
CN103498086A (en) * 2013-09-13 2014-01-08 郑州大学 High-strength high-ductility magnesium alloy and preparation process thereof

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1616697A (en) * 2004-11-11 2005-05-18 重庆大学 High plasticity magnesium alloy containing rare-earth yttrium
CN1789458A (en) * 2005-12-12 2006-06-21 西安理工大学 In-situ synthesizing quasi-crystal and approximate phase reinforced high-strength ultra-tough magnesium alloy and preparation method thereof
CN101050500A (en) * 2007-05-09 2007-10-10 南京云海特种金属股份有限公司 Wrought magnesium alloys in high intensity, high plasticity, and preparation method
CN101787472A (en) * 2010-03-18 2010-07-28 上海交通大学 Heat-resistant forged magnesium-rare earth alloy and preparation method thereof
EP2395119A1 (en) * 2010-05-21 2011-12-14 Helmholtz-Zentrum Geesthacht Zentrum für Material- und Küstenforschung GmbH Method for shaping a magnesium-based alloy by means of extrusion
CN103498086A (en) * 2013-09-13 2014-01-08 郑州大学 High-strength high-ductility magnesium alloy and preparation process thereof

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张思倩等: "热处理对挤压变形Mg-7%Zn-0.6%Zr-0.5%Y合金低周疲劳行为的影响", 《金属学报》 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105420577A (en) * 2015-12-25 2016-03-23 嘉瑞科技(惠州)有限公司 High-strength magnesium alloy and preparation method thereof
CN105420577B (en) * 2015-12-25 2018-04-17 嘉瑞科技(惠州)有限公司 A kind of magnesium alloy of high intensity and preparation method thereof
CN107190189A (en) * 2017-05-19 2017-09-22 宝鸡市金得利新材料有限公司 A kind of magnesium alloy for having mechanics and corrosion resistance concurrently and preparation method thereof
CN108728709A (en) * 2017-05-19 2018-11-02 曹丹丹 A kind of preparation method of magnesium alloy
CN109022978A (en) * 2017-05-19 2018-12-18 曹丹丹 The preparation method of magnesium alloy

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