CN1210424C - Cast magnesium alloy containing Nd and Sr and its prepn - Google Patents
Cast magnesium alloy containing Nd and Sr and its prepn Download PDFInfo
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- CN1210424C CN1210424C CN 02109834 CN02109834A CN1210424C CN 1210424 C CN1210424 C CN 1210424C CN 02109834 CN02109834 CN 02109834 CN 02109834 A CN02109834 A CN 02109834A CN 1210424 C CN1210424 C CN 1210424C
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Abstract
The present invention relates to a cast magnesium alloy containing Nd-Sr and a preparation method thereof. Aiming at the problems of the low strength and the insufficient strong-toughness of the existing AM50 magnesium alloy, the present invention provides a high-strength and high-toughness cast magnesium alloy containing Nd-Sr and a preparation method thereof. The alloy comprises the chemical compositions: 90.0 to 93.6 of Mg, 4.5 to 5.5 of Al, 0.3 to 0.6 of Mn, less than 0.02 of Zn, less than 0.025 of Si, less than 0.003 of Fe, less than 0.003 of Ni, less than 0.003 of Cu, 0.75 to 1.5 of Nd, 0.75 to 1.5 of Sr and less than 0.06 of other impurity. The preparation method of the present invention comprises the steps that an AM50 master alloy ingot is preheated to 100 to 200 DEG C and is melted in a furnace with the protection of SF6/CO2 gas; when a temperature reaches 680 DEG C, the Sr is wrapped by aluminium foil and then is directly added to the melt, and the Nd is firstly arranged in a special tool for preheating to 200 DEG C and then is added to the magnesium alloy melt for slightly stirring and warming to 720 to 750 DEG C; after being made to stand for half an hour, the magnesium alloy melt is reduced to 680 DEG C for compression casting. Compared with AM50, the alloy totally enhances room-temperature strong-toughness indexes.
Description
Technical field
The invention belongs to a kind of Magnuminium and preparation method thereof, specially refer to some high-strength and high ductility automobile structures, space flight and aviation and 3C field, require the cast magnesium alloys under the high security occasion, use.
Background technology
Current, magnesium alloy is low owing to having density, advantages such as specific tenacity and specific rigidity height, thereby be widely applied to space flight and aviation, automobile and 3C field.Wherein, AZ91 and AM50 are present commercial applications magnesium alloy materials the most widely.Compare with AZ91, the toughness of AM50 and impact resistance value are slightly high, but intensity is on the low side, and obdurability all awaits further raising.
Summary of the invention
The object of the invention is exactly at above-mentioned AM50 alloy and the deficiencies in the prior art, and a kind of novel high strength high toughness casting magnesium alloy of Nd-Sr and preparation method thereof that contains is provided.By on the basis of AM50 alloy, adding rear earth element nd (Nd) and Preparation of Metallic Strontium (Sr), improve the toughness of alloy, further improve the intensity of alloy, to satisfy the demand of above-mentioned industrial circle better.
Magnesium alloy of the present invention is the high strength high toughness casting magnesium alloy that contains Nd-Sr.Its method is to be mother alloy with industrial magnesium alloy AM50 ingot casting, and to wherein adding an amount of Nd and Sr, both add-ons are controlled at 0.75～1.5% (weight percent) respectively, and wherein Nd and Sr add by 1: 1 weight ratio.Alloy composition is: (weight percent) Al4.5～5.5%; Mn0.3～0.6%; Nd0.75～1.5%; Sr0.75～1.5%; Zn＜0.02%; Si＜0.025%; Fe＜0.003%; Ni＜0.003%; Cu＜0.003%; Other impurity＜0.06%; Surplus is Mg.
Manufacture method of the present invention is that to select industrial magnesium alloy AM50 ingot casting for use be mother alloy, and master alloy ingot is preheating to 100～200 ℃ and SF is being arranged
6/ CO
2The melt in furnace of gas shield when temperature reaches 680 ℃, directly joins Sr (wrapping up with aluminium foil) in the melt.Nd then places special tool to be preheated to 200 ℃ earlier, joins in the magnesium alloy fused mass again, and gentle agitation also is warming up to 720～750 ℃, leave standstill half an hour after, reduce to 680 ℃, carry out die casting.
The die casting casting flaw and the room temperature tensile performance that obtain reach:
Volume porosity (shrinkage cavity+loose rate) can reach＜1.2% scope; Tensile strength sigma
b=240～260MPa; Yield strength σ
0.2=110～120MPa; Unit elongation δ
10=15～20%.Under the same process condition, new alloy is than the room temperature obdurability index (σ of original mother alloy AM50
b=210MPa; σ
0.2=120MPa, δ=10%) all increase.This alloy is compared with former alloy A M50, and the increase of production cost is no more than 10%.
The high strength high toughness casting magnesium alloy that contains Nd-Sr that uses the inventive method to produce is improving the alloy flexible simultaneously, further obviously improves tensile strength.Characteristics of the present invention: (1) obtains best highly malleablized effect owing to selected pure rare earth element Nd when realizing microalloying, and can reduce the impurity that produces owing to alloying to greatest extent and be mingled with; (2) select metallic element Sr for use, when reaching minimizing Nd add-on, played the high highly malleablized effect of " polynary on a small quantity " alloying; (3) be mother alloy owing to selecting AM50 for use, make that the preparation of alloy is easy, highly versatile, thus make production operation simple.
Specific embodiments
The AM50 ingot casting is preheated to 150 ℃ in preheating oven, puts into smelting furnace at SF
6/ CO
2Be heated to 680 ℃ in the shielding gas atmosphere, Nd (being preheating to 200 ℃) and Sr (Sr wraps up with aluminium foil) are placed the container that has mesh, this container is inserted in bath, and ceaselessly rock and all dissolve until Nd-Sr.Gentle agitation is warmed up to 730 ℃, leave standstill half an hour after, reduce to 680 ℃ again, carry out die casting.The casting composition (by weight percentage) as shown in the table that obtains:
Other impurity of Mg Al Mn Zn Si Fe Ni Cu Nd Sr
92.6 5.237 0.304 0.013 0.015 0.0024 0.0022 0.00089 0.835 0.932 ＜0.06
Alloy die cast is become tension specimen, and the tensile property that records is: σ
b=255.5MPa; σ
0.2=114.162MPa; δ
10=17%.
Claims (2)
1, a kind of cast magnesium alloys that contains Nd-Sr is characterized in that the compositions in weight percentage of this alloy is: Al4.5～5.5%; Mn0.3～0.6%; Nd0.75～1.5%; Sr0.75～1.5%; Zn＜0.02%; Si＜0.025%; Fe＜0.003%; Ni＜0.003%; Cu＜0.003%; Other impurity＜0.06%; Surplus is Mg.
2, a kind of preparation contains the method for Nd-Sr cast magnesium alloys according to claim 1, it is characterized in that the AM50 master alloy ingot is preheating to 100-200 ℃ and SF is being arranged
6/ CO
2The melt in furnace of gas shield; when temperature reaches 680 ℃; directly join in melt with the aluminium foil parcel Sr; Nd then places special tool to be preheated to 200 ℃ earlier; join in the magnesium alloy fused mass, gentle agitation also is warming up to 720～750 ℃ again, leave standstill half an hour after; reduce to 680 ℃, carry out die casting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02109834 CN1210424C (en) | 2002-06-12 | 2002-06-12 | Cast magnesium alloy containing Nd and Sr and its prepn |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02109834 CN1210424C (en) | 2002-06-12 | 2002-06-12 | Cast magnesium alloy containing Nd and Sr and its prepn |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1403614A CN1403614A (en) | 2003-03-19 |
| CN1210424C true CN1210424C (en) | 2005-07-13 |
Family
ID=4740812
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02109834 Expired - Fee Related CN1210424C (en) | 2002-06-12 | 2002-06-12 | Cast magnesium alloy containing Nd and Sr and its prepn |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1210424C (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1306052C (en) * | 2004-09-17 | 2007-03-21 | 中国科学院上海微系统与信息技术研究所 | High corrosion resisting as cast magnalium and preparation method |
| IL181797A (en) * | 2007-03-08 | 2011-10-31 | Dead Sea Magnesium Ltd | Creep-resistant magnesium alloy for casting |
| CN101665944B (en) * | 2008-09-05 | 2011-06-15 | 淄博宏泰防腐有限公司 | Mg-Mn-Ca-Zn-Sr sacrificial anode with high current efficiency |
| CN104561716B (en) * | 2015-02-04 | 2017-10-17 | 威海万丰镁业科技发展有限公司 | A kind of magnesium alloy and preparation method thereof |
| CN106811641A (en) * | 2015-12-01 | 2017-06-09 | 镇江市润州金山金属粉末厂 | A kind of high-strength magnesium al-sr alloy |
| CN111286654A (en) * | 2020-04-13 | 2020-06-16 | 五台云海镁业有限公司 | High-performance magnesium alloy and preparation method thereof |
-
2002
- 2002-06-12 CN CN 02109834 patent/CN1210424C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1403614A (en) | 2003-03-19 |
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Owner name: SHENYANG UNIVERSITY OF SCIENCE AND TECHNOLOGY, SC Free format text: FORMER OWNER: SHENYANG POLYTECHNIC UNIV. Effective date: 20071012 |
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Effective date of registration: 20071012 Address after: 110027 No. 20, four street, economic and Technological Development Zone, Liaoning, Shenyang Patentee after: SHENYANG UNIVERSITY OF TECHNOLOGY SCIENCE PARK CO., LTD. Address before: 110023 No. 58 Xinghua South Street, Tiexi District, Liaoning, Shenyang Patentee before: Shenyang University of Technology |
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| ASS | Succession or assignment of patent right |
Owner name: SHENYANG JINBEI MAGNESIUM AUTOMOTIVE PARTS CO.LTD Free format text: FORMER OWNER: SHENYANG UNIVERSITY OF SCIENCE AND TECHNOLOGY, SCIENCE PARK CO., LTD. Effective date: 20071207 |
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Effective date of registration: 20071207 Address after: No. eight road in Liaoning city of Shenyang Province Economic and Technological Development Zone No. 6 Patentee after: Shenyang Jinbei magnesium Auto Parts Co., Ltd. Address before: No. four, 20 street, economic and Technological Development Zone, Liaoning, Shenyang Patentee before: SHENYANG UNIVERSITY OF TECHNOLOGY SCIENCE PARK CO., LTD. |
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Granted publication date: 20050713 Termination date: 20110612 |