CN109811205B - Yb microalloyed Al-Li alloy - Google Patents
Yb microalloyed Al-Li alloy Download PDFInfo
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- CN109811205B CN109811205B CN201910134164.6A CN201910134164A CN109811205B CN 109811205 B CN109811205 B CN 109811205B CN 201910134164 A CN201910134164 A CN 201910134164A CN 109811205 B CN109811205 B CN 109811205B
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- 229910001148 Al-Li alloy Inorganic materials 0.000 title claims abstract description 32
- 239000000956 alloy Substances 0.000 claims abstract description 36
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 34
- 230000032683 aging Effects 0.000 claims abstract description 23
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 229910052744 lithium Inorganic materials 0.000 claims description 9
- 238000005728 strengthening Methods 0.000 abstract description 14
- 230000000694 effects Effects 0.000 abstract description 10
- 238000001556 precipitation Methods 0.000 abstract description 3
- 239000006185 dispersion Substances 0.000 abstract 1
- 229910000821 Yb alloy Inorganic materials 0.000 description 14
- JFBZPFYRPYOZCQ-UHFFFAOYSA-N [Li].[Al] Chemical compound [Li].[Al] JFBZPFYRPYOZCQ-UHFFFAOYSA-N 0.000 description 4
- 239000001989 lithium alloy Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910017073 AlLi Inorganic materials 0.000 description 1
- 229910000542 Sc alloy Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000011258 core-shell material Substances 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- AHLBNYSZXLDEJQ-FWEHEUNISA-N orlistat Chemical compound CCCCCCCCCCC[C@H](OC(=O)[C@H](CC(C)C)NC=O)C[C@@H]1OC(=O)[C@H]1CCCCCC AHLBNYSZXLDEJQ-FWEHEUNISA-N 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Abstract
一种Yb微合金化的Al‑Li合金，属于合金材料技术领域。合金各组分含量按质量百分比为：Li 1.11％～2.00％，Yb 0％～0.19％，不可避免杂质含量<0.1％,余量为Al。获得良好强化效果且兼具经济性的优选成分范围为Li：1.35％～1.7％，Yb：0.15％～0.19％。通过微量Yb的诱导Al‑Li合金中强化相的快速弥散析出，可使Li含量较低成分范围内的合金产生明显的时效强化效果，扩大了可用的Li含量的成分范围，在获得良好的强化效果的同时兼具经济性。A Yb microalloyed Al-Li alloy belongs to the technical field of alloy materials. The content of each component of the alloy is: Li 1.11%-2.00%, Yb 0%-0.19%, unavoidable impurity content <0.1%, and the balance is Al. The preferable range of components to obtain a good strengthening effect and both economical efficiency is Li: 1.35% to 1.7%, and Yb: 0.15% to 0.19%. Through the rapid dispersion and precipitation of the strengthening phase in the Al-Li alloy induced by a small amount of Yb, the alloy with a low Li content can have a significant aging strengthening effect, and the available Li content can be expanded. Effective and economical at the same time.
Description
Technical Field
The invention relates to a Yb microalloyed Al-Li alloy, belonging to the technical field of alloy materials.
Background
The aluminum lithium alloy has the characteristics of low density, high elastic modulus and high specific strength, and is widely applied to the field of aerospace. Its remarkable age strengthening effect results from the massive diffusion precipitation of the metastable Al3Li phase of the L12 structure (Li maximum solid solubility in aluminum is 4.2 wt.%). With increasing Li content, the strength of the alloy increases significantly.
However, as the content of Li increases, a series of difficulties are brought to the production and application of the aluminum-lithium alloy. Firstly, Li is an element with very active chemical properties, oxide inclusions are very easily formed during smelting of the alloy, and when the content of Li in the alloy is increased, the burning loss of the Li element is increased and the oxide inclusions are increased, so that the production cost of the alloy is increased and the comprehensive mechanical properties of the alloy are influenced. Secondly, when the content of Li is high, a large-size AlLi phase is easily formed at a crystal boundary, and a non-precipitation zone (PFZ) of the alloy near the crystal boundary is widened, so that the comprehensive mechanical property of the alloy is influenced. Finally, in recent years, with the rapid development of new energy industries, the price of Li element is rising, so that the production cost of aluminum-lithium alloy is increasing.
When the content of Li is reduced to 1.9 wt% or less, the strengthening effect of the alloy is weak. In the former Soviet Union, trace Sc element is added into the aluminum lithium alloy to improve the performance of the alloy. Researches show that trace Sc elements are added into the Al-Li alloy, and a dispersed L12 core-shell structure strengthening phase is precipitated in the alloy through a complex two-stage aging process, so that the strengthening of the alloy is further improved. And the hardness of the Al-Li-Sc alloy is not obviously increased compared with that of the Al-Li alloy during single-stage aging. And because Sc element is expensive, the industrial application of Sc element is limited.
Yb, which is a microalloying element similar to Sc, is added to the alloy in a small amount and forms a stable Al3Yb phase of L12 structure during aging. And the Yb element is cheap, which is only one-thirtieth of the Sc element and one-third of the Li element. Therefore, the Yb and Li elements are added compositely, and the advantages of the Yb and Li elements are combined to obtain the alloy with lower cost and good aging strengthening effect.
Disclosure of Invention
The invention aims to provide an Yb microalloyed Al-Li alloy which is low in cost and can produce good aging strengthening.
The invention provides a Yb microalloyed Al-Li alloy, wherein Li and Yb in the alloy are Li: 1.10-2.00 percent, Yb 0-0.19 percent but not 0, and the content of inevitable impurities is less than 0.1 percent.
The preferred ranges of the Li and Yb components are Li: 1.35% -1.7%, Yb: 0.15 to 0.19 percent of the alloy can meet the requirement of good aging strengthening effect of the alloy and has economical efficiency.
The technical scheme of the invention has the advantages that:
after the alloy is subjected to solution treatment, the Yb microalloyed Al-Li alloy is subjected to single-stage aging for 1-288h at the corresponding temperature of 80-180 ℃, and has an aging strengthening effect; and compared with Al-Li alloy, the Al-Li-Yb alloy can produce good aging strengthening effect. The technical scheme of the alloy composition of the invention has good aging strengthening effect and economy.
Drawings
FIG. 1 is a curve showing the change of microhardness with aging time of Al-1.12Li and Al-1.11Li-0.17Yb alloys in the aging process at 80 ℃;
FIG. 2 is a curve showing the change of microhardness with aging time of Al-1.35Li and Al-1.35Li-0.17Yb alloys in aging process at 100 ℃;
FIG. 3 is a curve of change of microhardness with aging time of Al-1.70Li and Al-1.67Li-0.17Yb alloys in aging process at 150 ℃;
FIG. 4 is a graph showing the change of microhardness with aging time of Al-2.00Li and Al-2.00Li-0.17Yb alloys during aging at 180 ℃;
FIG. 5 is a graph comparing maximum achievable microhardness with price for alloys of different compositions.
Detailed Description
The invention will be further described with reference to the following drawings and examples, but the invention is not limited to the following examples.
The Yb microalloyed Al-Li alloy comprises the following components in percentage by mass of Li: 1.10 to 2.00 percent, 0 to 0.19 percent of Yb and not 0, the content of inevitable impurities is less than 0.1 percent, and the alloy is subjected to single-stage aging for 1 to 288 hours at the temperature of between 80 and 180 ℃.
Example 1
The components comprising Li and Yb in percentage by mass are respectively Li: 1.1% -1.4%, Yb: 0.15 to 0.17 percent of Al-Li-Yb alloy and Al-Li alloy with the same Li content are taken as examples. As can be seen from FIG. 5, the Al-Li-Yb alloy increased the cost by 3.2% compared to the Al-Li alloy. The component alloy is preferably aged at 100 ℃. From the hardness curve of FIG. 2, it can be seen that Al-Li-Yb is aged for 168h at 100 deg.C
The alloy hardness can reach 74.5Hv, the hardness of the Al-Li alloy has no obvious change and is about 34Hv, and the hardness of the Al-Li-Yb alloy is about 2.2 times that of the Al-Li alloy.
Example 2
The components comprising Li and Yb in percentage by mass are respectively Li: 1.6% -1.7%, Yb: 0.15 to 0.17% of Al-Li-Yb alloy and Al-Li alloy having the same Li content are exemplified. As can be seen from FIG. 5, the Al-Li-Yb alloy has a 0.9% cost increase over the Al-Li alloy, which is preferably aged at 150 ℃. As shown in the hardness curve of FIG. 3, the Al-Li-Yb alloy can reach 92Hv after aging for 24-72 h at 150 ℃, while the hardness of the Al-Li alloy has no obvious change and is about 36Hv, and the hardness of the Al-Li-Yb alloy is about 2.6 times that of the Al-Li alloy.
Comparative example 1
The components comprising Li and Yb in percentage by mass are respectively Li: 1.1% -1.2%, Yb: Al-Li-Yb alloy of 0.15-0.17% and Al-Li with the same Li content are taken as examples of the alloy. The alloy is preferably aged at 80 ℃. As can be seen from FIG. 5, the Al-Li-Yb alloy increased the cost by 1.3% compared to the Al-Li alloy, and from FIG. 1 it can be seen that the hardness of the Al-Li-Yb alloy was only 15Hv higher than that of the Al-Li alloy when aged at 80 ℃ for 48 hours.
Comparative example 2
The components comprising Li and Yb in percentage by mass are respectively Li: 2.0% -2.1%, Yb: Al-Li-Yb alloy of 0.15-0.17% and Al-Li with the same Li content are taken as examples of the alloy. The alloy is preferably aged at 180 ℃. As can be seen from FIG. 5, the cost of Al-Li-Yb alloy is increased by 2.4% compared with Al-Li alloy, and from FIG. 4, the hardness of Al-Li-Yb alloy is only about 5Hv higher than that of Al-Li alloy when aged at 180 ℃ for 48 hours.
By combining the analysis, the Yb microalloyed Al-Li alloy provided by the invention can obtain good aging strengthening effect and has economical efficiency, and the components in percentage by mass are Li: 1.3% -1.7%, Yb: 0.15-0.19%, unavoidable impurity content less than 0.1%, and the balance of Al.
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| CN201910134164.6A CN109811205B (en) | 2019-02-22 | 2019-02-22 | Yb microalloyed Al-Li alloy |
| PCT/CN2020/075645 WO2020169014A1 (en) | 2019-02-22 | 2020-02-18 | Yb-microalloyed ai-li alloy |
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| CN107190219B (en) * | 2017-04-07 | 2019-09-17 | 上海交通大学 | The heat treatment method of the Casting Al-Li Alloy containing magnesium |
| CN107641740A (en) * | 2017-10-11 | 2018-01-30 | 广州宇智科技有限公司 | A kind of anti-flaming Al Li V alloys |
| CN107779681A (en) * | 2017-10-13 | 2018-03-09 | 广州宇智科技有限公司 | Al Li Cr alloys with fire retardancy |
| CN107747005A (en) * | 2017-10-20 | 2018-03-02 | 广州宇智科技有限公司 | Containing Sb and Te can be fire-retardant aluminium lithium alloy and its processing technology |
| CN107881371B (en) * | 2017-11-09 | 2020-07-14 | 上海交通大学 | Method for improving plasticity of cast aluminum lithium alloy |
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Non-Patent Citations (2)
| Title |
|---|
| "Creep properties and precipitate evolution in Al–Li alloys microalloyed with Sc and Yb";Matthew E. Krug et al.;《Materials Science and Engineering: A》;20120730;第550卷;第300-311页 * |
| "Effects of Li additions on precipitation-strengthened Al–Sc and Al–Sc–Yb alloys";M. E. Krug et al.;《Acta Materialia》;20110228;第59卷(第4期);第1700-1715页 * |
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