CN101148724A - Aluminum-free heat-resistant die-casting rare earth magnesium alloy - Google Patents

Aluminum-free heat-resistant die-casting rare earth magnesium alloy Download PDF

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Publication number
CN101148724A
CN101148724A CNA2007100562808A CN200710056280A CN101148724A CN 101148724 A CN101148724 A CN 101148724A CN A2007100562808 A CNA2007100562808 A CN A2007100562808A CN 200710056280 A CN200710056280 A CN 200710056280A CN 101148724 A CN101148724 A CN 101148724A
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China
Prior art keywords
alloy
rare earth
magnesium
magnesium alloy
heat
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CNA2007100562808A
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Chinese (zh)
Inventor
孟健
王军
张景怀
张德平
房大庆
唐定骧
张洪杰
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Changchun Institute of Applied Chemistry of CAS
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Changchun Institute of Applied Chemistry of CAS
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Priority to CNA2007100562808A priority Critical patent/CN101148724A/en
Publication of CN101148724A publication Critical patent/CN101148724A/en
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Abstract

The heat resistant no-aluminum die cast Mg-RE alloy consists of Y 2-4 wt%, Gd 0.2-0.6 wt%, Zn 0.3-0.6 wt%, Mn 0.1-0.3 wt%, and Mg for the rest. Y as the excellent additive for raising the performance of Mg alloy can refine the dendrite crystal in the alloy, increase the rate of fiber structures in alloy fracture and raise the plasticity of the alloy; and Gd and Zn serve as the alloy reinforcing elements too. The heat resistant no-aluminum die cast Mg-RE alloy has excellent room temperature mechanical performance, high temperature mechanical performance superior to that of AE44 alloy, and excellent creep resistance in the conditions up to 250 deg.c and 30 MPa.

Description

Not aluminiferous heat-resistant die-casting rare earth magnesium alloy
Technical field
The present invention relates to not aluminiferous heat-resistant die-casting rare earth magnesium alloy, belong to the magnesium alloy materials field.
Background technology
In recent years, because the enhancing of environmental protection pressure and awareness of saving energy is applied on automobile based on the lightweight diecast magnesium alloy of Mg-Al base alloy.Yet compare with aluminium alloy, also there is a big difference for Application of Magnesium, and one of its reason is to lack enough high-temperature behaviors.AZ, the AM series diecast magnesium alloy life-time service temperature of widespread use at present can not surpass 120 ℃, makes it can't be used for making to the demanding vehicle transmission parts of high temperature creep property, has therefore hindered the further application of magnesium alloy greatly.Studies show that, improve the sedimentary stability of smectic circle, can improve the resistance toheat of diecast magnesium alloy, its method is added rare earth element exactly and is reduced aluminium content, is exactly the not aluminiferous diecast magnesium alloy of design in addition.Based on this, rare earth is introduced into the magnesium alloy that the exploitation of Mg-Al base alloy has high-temperature creep resistance, for example AE42, AE44 etc.MEL company has also developed a kind of not aluminiferous die-casting rare earth magnesium alloy MEZ (Mg-1.92%RE-0.33%Zn-0.26%Mn), this alloy has the better creep-resistant property than AE42 at 150 ℃~175 ℃, but, very low (the I.P.Moreno of its yield strength and tensile strength, Scripta Materialia 2003, the 1029-1034 page or leaf).
Rare earth is approved by domestic and international research unit and manufacturer as alloying (microalloying) element that improves traditional magnesium alloy resistance toheat and development of new heat resistance magnesium alloy, employed rare earth comprises single pure rare earth, as Nd, Y, Gd, and mishmetal, at present use maximum mishmetals to be cerium-rich mischmetal, main component is La, Ce, Pr, Nd; Rich yttrium mixed rare earth, main component is Y, Ho, Er, Gd; Praseodymium neodymium mixed rare-earth, main component are Pr and Nd.
Summary of the invention
The present invention is directed to the weakness of present diecast magnesium alloy, not aluminiferous heat-resistant die-casting rare earth magnesium alloy is provided, it is moderate that this alloy has intensity, and the characteristics of fine heat-resisting performance can be for a long time 200~250 ℃ of uses.
Implement technical scheme of the present invention: not aluminiferous heat-resistant die-casting rare earth magnesium alloy, its composition and mass percent are: yttrium: 2%~4%, gadolinium: 0.2%~0.6%, zinc: 0.3%~0.6%, manganese: 0.1%~0.3%, the total amount of impurity element Fe, Cu and Ni is less than 0.03%, and surplus is a magnesium.
The preparation method's of aluminiferous heat-resistant die-casting rare earth magnesium alloy step and condition are not as follows:
By the proportioning weighing; Earlier pure magnesium, zinc, magnesium manganese master alloy are put into and be preheated to 650 ℃ of crucibles, and feed shielding gas SF 6And N 2Mixed gas; after the furnace charge of 720 ℃ of addings melts fully; continue to be warming up to 750 ℃, add magnesium-yttrium and magnesium-gadolinium rare earth intermediate alloy, and continue logical shielding gas; after magnesium-yttrium and magnesium-gadolinium rare earth intermediate alloy fusing; stir down at 750 ℃, logical argon gas refining is left standstill then; be cooled to 700~680 ℃ and carry out die casting, obtain not aluminiferous heat-resistant die-casting rare earth magnesium alloy.
Beneficial effect: 1) yttrium the present invention is used to improve the principal element of alloy strength and resistance toheat, it is the good additive that improves magnesium alloy mechanical property, be considered to improve in the rare earth element one of effective elements of magnesium alloy high-temperature behavior, it can make the dendrite refinement of alloy, generates Mg at crystal boundary 2The Y precipitated phase, Mg 2Y has high thermostability mutually, can effectively stop crystal boundary slippage under hot conditions, and alloy fracture fibrous tissue ratio and alloy plasticity improve.2) a spot of gadolinium can also improve the castability of alloy, plays certain solution strengthening effect simultaneously.Simultaneously, rare earth element is the surface active element of magnesium alloy, and rare earth forms MgO, RE at alloy liquid surface aggregation during alloy melting 2O 3Etc. polynary composite compact oxide skin, alleviate oxidative phenomena, improve the combustion initiation temperature of alloy, help the founding of alloy; In the alloy liquid process of setting, rare earth improves the constitutional supercooling degree in the enrichment of solid-liquid forward position, helps the refinement alloy structure.Therefore rare earth element helps to improve the over-all properties of alloy.3) in the Mg-Y alloy, add the creep-resistant property (MayumiSuzuki that a small amount of Zn can improve alloy, Materials Science and Engineering 2004, the 706-709 page or leaf) 4) effect of manganese mainly is the corrosion resistance nature that improves alloy, manganese can form compound with iron in the magnesium alloy or other heavy metal elements, it is excluded as slag, thereby elimination iron or other heavy metal elements are to the harmful effect of corrosion stability of magnesium alloy.
Description of drawings
Fig. 1 is the as-cast structure figure of the embodiment 4 of interalloy of the present invention.
Fig. 2 is the composition analysis figure of precipitated phase.
Fig. 3 be embodiment 4 at 200 ℃, the creep curve figure under 70MPa and the 90MPa condition.
Curve 1,2 be respectively embodiment 4 at 200 ℃, the creep curve under 70MPa and the 90MPa condition, curve 3 are at 200 ℃, the creep curve of AE44 under the 70MPa condition.
Fig. 4 be embodiment 4 at 250 ℃, the creep curve figure under 30MPa and the 50MPa condition.
Curve 1,2 be respectively embodiment 4 at 250 ℃, the creep curve under 30MPa and the 50MPa condition.
Five, embodiment
Embodiment 1
A kind of not aluminiferous heat-resistant die-casting rare earth magnesium alloy is made up of yttrium, gadolinium, zinc, manganese and magnesium, and its proportioning (mass percent) is: yttrium: 2%, gadolinium: 0.2%, zinc: 0.3%, manganese: 0.15%, the total amount of impurity element Fc, Cu and Ni is less than 0.03%, and surplus is a magnesium.
The preparation method's of aluminiferous heat-resistant die-casting rare earth magnesium alloy step and condition are not as follows:
By the proportioning weighing; Earlier pure magnesium, zinc, magnesium manganese master alloy are put into and be preheated to 650 ℃ of crucibles, and feed shielding gas SF 6And N 2Mixed gas.At 720 ℃, wait the furnace charge of adding to melt fully after, continue to be warming up to 750 ℃, add magnesium-yttrium and magnesium-gadolinium rare earth intermediate alloy, and continue logical shielding gas.After magnesium-yttrium and magnesium-gadolinium rare earth intermediate alloy fusing, stir down at 750 ℃, logical argon gas refining is left standstill then, and being cooled to 700~680 ℃ carries out die casting, obtains not aluminiferous heat-resistant die-casting rare earth magnesium alloy.
Embodiment 2
A kind of not aluminiferous heat-resistant die-casting rare earth magnesium alloy is made up of yttrium, gadolinium, zinc, manganese and magnesium, and its proportioning (mass percent) is: yttrium: 2%, gadolinium: 0.6%, zinc: 0.5%, manganese: 0.2%, the total amount of impurity element Fe, Cu and Ni is less than 0.03%, and surplus is a magnesium.Alloy property sees Table 1 and table 2.
The not preparation method's of aluminiferous heat-resistant die-casting rare earth magnesium alloy step and condition such as embodiment 1.
Embodiment 3
A kind of not aluminiferous heat-resistant die-casting rare earth magnesium alloy is made up of yttrium, gadolinium, zinc, manganese and magnesium, and its proportioning (mass percent) is: yttrium: 3%, gadolinium: 0.4%, zinc: 0.6%, manganese: 0.2%, the total amount of impurity element Fe, Cu and Ni is less than 0.02%, and surplus is a magnesium.
The not preparation method's of aluminiferous heat-resistant die-casting rare earth magnesium alloy step and condition such as embodiment 1.
Embodiment 4
A kind of not aluminiferous heat-resistant die-casting rare earth magnesium alloy is made up of yttrium, gadolinium, zinc, manganese and magnesium, and its proportioning (mass percent) is: yttrium: 4%, gadolinium: 0.4%, zinc: 0.6%, manganese: 0.3%, the total amount of impurity element Fe, Cu and Ni is less than 0.03%, and surplus is a magnesium.
The not preparation method's of aluminiferous heat-resistant die-casting rare earth magnesium alloy step and condition such as embodiment 1.
Table 1 is the room-temperature mechanical property of the embodiment of the invention 1, example 2, example 3 and example 4.
Table 2 is the mechanical behavior under high temperature of the embodiment of the invention 4.
Table 3 is high-temperature creep resistances of the embodiment of the invention 4.
Wherein, AE44 is the novel anti high temperature creep diecast magnesium alloy of Norway Hydro magnesium industry company in 2005 exploitation, has been used to produce auto parts, for example the engine bracker of automobile, the data of AE44 are the samples that prepare under similarity condition in the table 3, and the data that obtain under same test condition.
The room-temperature mechanical property of table 1 embodiment of the invention 1, example 2, example 3 and example 4
Alloy number Tensile strength (MPa) Yield strength (MPa) Unit elongation (%)
Embodiment 1 embodiment 2 embodiment 3 embodiment 4 AE44 182 194 205 220 248 105 116 132 143 140 11 10 13 12 11
The mechanical behavior under high temperature of table 2 embodiment of the invention 4.
Temperature Tensile strength (MPa) Yield strength (MPa) Unit elongation (%)
100℃ 150℃ 200℃ AE44(200℃) 250℃ 300℃ 194 192 186 115 178 137 118 115 115 100 109 95 13 14 11 19 15 25
Table 3 embodiment of the invention 4 high-temperature creep resistances
Temperature/load Creep rupture life (hour) Hundred hours unit elongation (%) Minimum creep rate (10 -9s -1)
200℃/70MPa 200℃/90MPa 250℃/30MPa 250℃/50MPa AE44(200℃/70MPa) >100 >100 >100 >100 >100 0.03 0.09 0.30 1.17 0.18 0.87 2.12 3.41 35.7 3.42

Claims (1)

1. not aluminiferous heat-proof compression casting magnesium-rare earth alloy is characterized in that moiety and weight percent thereof are: Y:2%~4%, Gd:0.2%~0.6%, Zn:0.3%~0.6%, Mn:0.1%~0.3%, the total amount of impurity element Fe, Cu and Ni is less than 0.03%, and surplus is a magnesium.
CNA2007100562808A 2007-11-06 2007-11-06 Aluminum-free heat-resistant die-casting rare earth magnesium alloy Pending CN101148724A (en)

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Application Number Priority Date Filing Date Title
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103014468A (en) * 2012-12-20 2013-04-03 常熟市东方特种金属材料厂 Magnesium-gadolinium-yttrium alloy
CN106119647A (en) * 2016-08-27 2016-11-16 冉兴 High-strength magnesium alloy and the manufacture method of component thereof with water generation controllable reaction
CN107739947A (en) * 2017-10-24 2018-02-27 重庆理工大学 A kind of Mg Y Mn Sc heat resistance magnesium alloys and preparation method thereof
CN109797332A (en) * 2019-03-29 2019-05-24 南京航空航天大学 High-toughness heat-resistant Mg-Gd-Y alloy and preparation method thereof suitable for low pressure casting

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103014468A (en) * 2012-12-20 2013-04-03 常熟市东方特种金属材料厂 Magnesium-gadolinium-yttrium alloy
CN106119647A (en) * 2016-08-27 2016-11-16 冉兴 High-strength magnesium alloy and the manufacture method of component thereof with water generation controllable reaction
CN107739947A (en) * 2017-10-24 2018-02-27 重庆理工大学 A kind of Mg Y Mn Sc heat resistance magnesium alloys and preparation method thereof
CN109797332A (en) * 2019-03-29 2019-05-24 南京航空航天大学 High-toughness heat-resistant Mg-Gd-Y alloy and preparation method thereof suitable for low pressure casting
CN109797332B (en) * 2019-03-29 2021-01-19 南京航空航天大学 High-strength-toughness heat-resistant Mg-Gd-Y alloy suitable for low-pressure casting and preparation method thereof

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