CN109943737A - The technique of isotropic high-ductility magnesium lithium alloy plate in preparation face - Google Patents
The technique of isotropic high-ductility magnesium lithium alloy plate in preparation face Download PDFInfo
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- CN109943737A CN109943737A CN201910228095.5A CN201910228095A CN109943737A CN 109943737 A CN109943737 A CN 109943737A CN 201910228095 A CN201910228095 A CN 201910228095A CN 109943737 A CN109943737 A CN 109943737A
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- lithium alloy
- magnesium lithium
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- ingot casting
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Abstract
The invention discloses a kind of techniques for preparing isotropic high-ductility magnesium lithium alloy plate in face: 1) taking melting raw material, aluminium alloy is obtained by vacuum melting, quenching is cooling to obtain as cast condition magnesium lithium alloy, and ingot casting carries out stress relief annealing in 150~250 DEG C of 8~14h of heat preservation immediately after casting；2) in 250~350 DEG C of 1~5h of heat preservation, then water cooling；3) up-down rollers revolving speed the rolling and forming of magnesium lithium alloy ingot casting: is disposed as 5~15r/min；8~24 passages of the operation of rolling point carry out, and magnesium lithium alloy ingot casting carries out the first passes along long side, and draught per pass is 3%~10%, magnesium lithium alloy ingot casting are rotated 15 °~45 ° in the same direction per pass, overall reduction is 50~70%；4) it dries, anneals after the magnesium lithium alloy after rolling being rolled plate cleaning, temperature is 200~350 DEG C, and the time is 1~5h, and the type of cooling is water cooling.
Description
Technical field
The present invention relates to magnesium lithium alloy forming technique fields, prepare isotropic high-ductility in face more particularly, to a kind of
The technique of magnesium lithium alloy plate.
Background technique
Since magnesium alloy has, light weight, intensity is high, rigidity is good, processing performance is good, dimensional stability is high, shock resistance, declines
It is good and the advantages that be easily recycled to subtract performance, is the good material for manufacturing the devices such as automobile, space flight and aviation, electric equipment products, magnesium
The rolling technique research of sheet alloy has become an important topic of field of material processing.Two-phase magnesium lithium alloy is different from general
Logical single-phase magnesium alloy, two-phase magnesium lithium alloy have two phase structure, and α phase is close-packed hexagonal structure, and β phase is body-centered cubic structure.
Rolling magnesium lithium alloy plate often will appear anisotropy especially plastic anisotropy due to the tissue opposite sex；In the processing of plate
In the process, researcher wishes that plate plasticity in all directions and intensity are average, and it is further to be conducive to plate in this way
Processing, but at present there is no preferable two-phase magnesium lithium alloy plate forming technology.
Summary of the invention
The purpose of the present invention is provide a kind of to prepare isotropic high-ductility magnesium lithium alloy plate in face regarding to the issue above
The technique of material, elongation and intensity of the plate of technique preparation in face in all directions are average at room temperature.
Realizing the technical solution of the purpose is:
A kind of technique preparing isotropic high-ductility magnesium lithium alloy plate in face, includes the following steps:
1) taking pure magnesium, pure lithium, fine aluminium, pure zinc and fine silver is melting raw material, and material composition mass percent is Li:7.0-
9.5%, Zn:0.4-1.2%, Al:0.03-0.1%, Ag:0.02-0.06%, remaining is Mg；Alloy is obtained by vacuum melting
Liquid, quenching is cooling to obtain as cast condition magnesium lithium alloy, and ingot casting answer in 150~250 DEG C of 8~14h of heat preservation immediately after casting
Power annealing；
2) Homogenization Treatments are carried out in 250~350 DEG C of 1~5h of heat preservation, then water cooling；
3) the up-down rollers revolving speed of roller mill the rolling and forming of magnesium lithium alloy ingot casting: is disposed as 5~15r/min；Rolling
Process point 8~24 passages carry out, and magnesium lithium alloy ingot casting carries out the first passes along long side, and draught per pass is 3%~
12%, magnesium lithium alloy ingot casting is rotated to 15 °~45 ° (clockwise or counter-clockwise) in the same direction per pass, overall reduction is
50~70%；
4) it dries, anneals after the magnesium lithium alloy after rolling being rolled plate cleaning, temperature is 200~350 DEG C, and the time is 1~5h,
The type of cooling is water cooling.
Content of impurities is no more than 0.1% in the melting raw material.
The rolling temperature of step 3) is room temperature.
The roll forming of step 3) magnesium lithium alloy ingot casting is carried out on vertical roller mill.
The beneficial effects of the present invention are: to roll plate yield strength of all directions in face poor for magnesium lithium alloy produced by the invention
Different 10% for being no more than 8MPa, average elongation >=40%, and the elongation percentage difference of all directions and being no more than average elongation.This
Invention, which is effectively reduced, rolls the intra-face anisotropy situation occurred in plate in magnesium alloy, and plasticity is in a higher water
It is flat, it is more advantageous to following process.
Detailed description of the invention
Fig. 1 is tensile stress strain curve figure of the magnesium lithium alloy of sample 5 in face in all directions.
Fig. 2 is that the tensile stress-strain by the magnesium lithium alloy of the reference substance 1 of unidirection rolling in face in all directions is bent
Line chart.
Specific embodiment
Below with reference to embodiment, the invention will be further described, but not thereby limiting the invention.
Experimental method in following embodiments is unless otherwise instructed conventional method.
Embodiment 1
Isotropic high-ductility magnesium lithium alloy plate in preparation face operates in accordance with the following steps:
1) taking high purity magnesium, pure lithium, fine aluminium, pure zinc and fine silver is melting raw material, ingredient percent Li:7.0-
9.5%, Zn:0.4-1.2%, Al:0.03-0.1%, Ag:0.02-0.06%, impurity include S and Si etc., and wherein impurity always contains
Amount is no more than 0.1%, remaining is Mg.It melts magnesium, lithium and zinc first by vacuum melting and obtains aluminium alloy, sufficiently add again after heat preservation
Enter zinc, silver, it is finally cooling to melting kettle direct quenching to obtain as cast condition magnesium lithium alloy, ingot casting cast after immediately 150~
250 DEG C of 8~14h of heat preservation carry out stress relief annealing.
2) Homogenization Treatments are carried out in 250~350 DEG C of 1~5h of heat preservation, then water cooling.
3) rolling and forming of magnesium lithium alloy ingot casting is carried out on vertical roller mill:
1. rolling temperature is room temperature；
2. up-down rollers revolving speed is disposed as 5~15r/min, up-down rollers distance is adjusted, prepares rolling；
3. 8~24 passages of the operation of rolling point carry out, magnesium lithium alloy ingot casting carries out the first passes along long side, presses per pass
Lower amount be 3%~12%, per pass by magnesium lithium alloy ingot casting along clockwise (or counterclockwise, same ingot casting to be processed is each
Direction of rotation is the same) 15 °~45 ° of rotation, overall reduction is 50~70%.
4) it dries after the magnesium lithium alloy after rolling being rolled plate cleaning, anneals after being put into chamber type electric resistance furnace, temperature 200
~350 DEG C, the time is 1~5h, and the type of cooling is water cooling.
Sample 1~5 is prepared using the above method, the magnesium lithium alloy raw material used, the mass percent of each ingredient such as 1 institute of table
Show:
Each composition quality score of magnesium lithium alloy raw material that 1 sample 1~5 of table uses
In abovementioned steps 1) after magnesium lithium alloy ingot casting is cut into 45mm × 50mm × 4.3mm plate, then carry out
Homogenization Treatments and cooling, the type of cooling are water cooling.Then rolled on milling train.Provide that the first passage rolling direction is RD
Direction, plate is rotated clockwise certain degree and rolled by every a time later.It anneals after the completion of rolling to plate
And cooling treatment, the type of cooling are water cooling.
It is as shown in table 2 below to prepare each process parameter when sample 1--5:
The preparation process design parameter of 2 sample 1--5 of table
It respectively obtains after the completion of preparation with a thickness of the magnesium lithium alloy plate of 1.5,1.9,1.6,2.0,1.3mm.
The magnesium lithium alloy plate surface of obtained sample 5 is polished, oxide skin is removed, with linear cutter at stretching
Sample.Tension test, rate of extension 1mm/min are carried out at room temperature.Table 3 gives the rolled plate of sample 2,4,5 each
Tensile mechanical properties on a direction, Fig. 1 are stretching of the multidirectional rolled plate of magnesium lithium alloy of sample 5 in face in all directions
Stress-strain curve diagram.
The mechanical property of the multidirectional rolled plate of 3 sample of table 2,4,5 in all directions
Prepare reference substance 1, raw material of the alloy raw material of use with sample 5, the technological parameter of technological parameter reference sample 5,
But reference substance 1 is multi-pass unidirection rolling, rolling direction is always along the direction RD, and draught per pass 8%, total passage is 8.
1 surface of reference substance is polished, removes oxide skin by the magnesium lithium alloy plate that 1.3mm thickness is also obtained after rolling, with wire cutting plus
Work carries out tension test, rate of extension 1mm/min at tensile sample at room temperature.Table 4 gives the magnesium by unidirection rolling
Tensile mechanical properties of the lithium alloy plate (i.e. reference substance 1) in face in all directions, Fig. 2 are each side in face of reference substance 1
Upward tensile stress strain curve figure.
The mechanical property of the magnesium lithium alloy unidirection rolling plate of 4 reference substance 1 of table in all directions
Reference substance 2 is prepared, the alloy raw material used is AZ31 magnesium alloy materials, the mass content of each ingredient are as follows: Al contains
It is 0.95%, Mn content is 0.28% that amount, which is 3.01%, Zn content, impurity element S i, Fe, Cu content is respectively 0.022%,
0.012% and 0.0104%, remaining is Mg.The preparation process of reference sample 5 processes, the ground different from the technique of sample 5
Side are as follows: rolling temperature is 350 DEG C, it is specified that the first passage rolling direction is the direction RD, and every a time is by plate along clockwise later
45 ° of rotation is rolled, draught per pass 11%, and total passage is 8, and total roll reduction is 60%.It will be obtained after rolling
AZ31 magnesium alloy plate surface polish, remove oxide skin, with linear cutter at tensile sample.It is drawn at room temperature
Stretch test, rate of extension 1mm/min.Table 5 gives drawing of the magnesium alloy rolling plates of reference substance 2 in face in all directions
Stretch mechanical property.
The mechanical property of the multidirectional rolled plate of AZ31 of 5 reference substance 2 of table in all directions
Claims (4)
1. a kind of technique for preparing isotropic high-ductility magnesium lithium alloy plate in face, characterized by the following steps:
1) taking pure magnesium, pure lithium, fine aluminium, pure zinc and fine silver is melting raw material, and material composition mass percent is Li:7.0-9.5%,
Zn:0.4-1.2%, Al:0.03-0.1%, Ag:0.02-0.06%, remaining is Mg；Aluminium alloy is obtained by vacuum melting, is quenched
Fire is cooling to obtain as cast condition magnesium lithium alloy, and ingot casting carries out destressing in 150~250 DEG C of 8~14h of heat preservation immediately after casting and moves back
Fire；
2) Homogenization Treatments are carried out in 250~350 DEG C of 1~5h of heat preservation, then water cooling；
3) the up-down rollers revolving speed of roller mill the rolling and forming of magnesium lithium alloy ingot casting: is disposed as 5~15r/min；The operation of rolling
8~24 passages are divided to carry out, magnesium lithium alloy ingot casting carries out the first passes along long side, and draught per pass is 3%~10%, often
Magnesium lithium alloy ingot casting is rotated 15 °~45 ° by passage in the same direction, and overall reduction is 50~70%；
4) it dries, anneals after the magnesium lithium alloy after rolling being rolled plate cleaning, temperature is 200~350 DEG C, and the time is 1~5h, cooling
Mode is water cooling.
2. technique as described in claim 1, it is characterised in that: content of impurities is no more than 0.1% in the melting raw material.
3. technique as described in claim 1, it is characterised in that: the rolling temperature of step 3) is room temperature.
4. technique as described in any one of claims 1 to 3, it is characterised in that: step 3) magnesium lithium alloy ingot casting is rolled into
Type is carried out on vertical roller mill.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114277295A (en) * | 2021-11-30 | 2022-04-05 | 郑州大学 | High-strength magnesium-lithium alloy with weak basal plane texture and preparation method thereof |
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| CN101857933A (en) * | 2009-04-10 | 2010-10-13 | 中国科学院金属研究所 | Hot rolling process of high-plasticity and low-anisotropy magnesium alloy and sheet thereof |
| DE102012108089A1 (en) * | 2012-08-31 | 2014-05-15 | Gottfried Wilhelm Leibniz Universität Hannover | Magnesium alloy used for formation of work samples used as medical device e.g. implant and suture, comprises magnesium and zinc, and rare-earth metal in specified weight ratio |
| CN104498793A (en) * | 2015-01-04 | 2015-04-08 | 哈尔滨工程大学 | High-strength/toughness magnesium lithium alloy and preparation method thereof by accumulative roll bonding process |
| CN105239030A (en) * | 2015-09-08 | 2016-01-13 | 湖南理工学院 | Technique for cold rolling and post-rolling heat treatment of LA91 magnesium lithium alloy |
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2019
- 2019-03-25 CN CN201910228095.5A patent/CN109943737B/en active Active
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| CN101857933A (en) * | 2009-04-10 | 2010-10-13 | 中国科学院金属研究所 | Hot rolling process of high-plasticity and low-anisotropy magnesium alloy and sheet thereof |
| DE102012108089A1 (en) * | 2012-08-31 | 2014-05-15 | Gottfried Wilhelm Leibniz Universität Hannover | Magnesium alloy used for formation of work samples used as medical device e.g. implant and suture, comprises magnesium and zinc, and rare-earth metal in specified weight ratio |
| CN104498793A (en) * | 2015-01-04 | 2015-04-08 | 哈尔滨工程大学 | High-strength/toughness magnesium lithium alloy and preparation method thereof by accumulative roll bonding process |
| CN105239030A (en) * | 2015-09-08 | 2016-01-13 | 湖南理工学院 | Technique for cold rolling and post-rolling heat treatment of LA91 magnesium lithium alloy |
| CN105755410A (en) * | 2016-04-20 | 2016-07-13 | 中南大学 | Production process of ultralight double-phase magnesium-lithium-alloy plate |
| CN108817084A (en) * | 2018-06-28 | 2018-11-16 | 河南工程学院 | A kind of preparation method of Mg-Li alloy foil |
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| 门枢: "Ag掺杂对镁锂合金微观结构和力学性能影响的研究", 《中国优秀硕士学位论文数据库 工程科技I辑》 * |
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|---|---|---|---|---|
| CN114277295A (en) * | 2021-11-30 | 2022-04-05 | 郑州大学 | High-strength magnesium-lithium alloy with weak basal plane texture and preparation method thereof |
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