CN109881129B - Aging treatment process for Al-Li-Yb alloy - Google Patents
Aging treatment process for Al-Li-Yb alloy Download PDFInfo
- Publication number
- CN109881129B CN109881129B CN201910191406.5A CN201910191406A CN109881129B CN 109881129 B CN109881129 B CN 109881129B CN 201910191406 A CN201910191406 A CN 201910191406A CN 109881129 B CN109881129 B CN 109881129B
- Authority
- CN
- China
- Prior art keywords
- alloy
- hardness
- aging
- aging treatment
- treatment process
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Heat Treatment Of Articles (AREA)
- Golf Clubs (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
An aging treatment process of Al-Li-Yb alloy, belonging to the technical field of nonferrous metals. Al is induced by adding microalloy element Yb3The precipitation of the Li strengthening phase enables the alloy to produce obvious strengthening effect through aging treatment. The components of the alloy are Li 1.2-1.5 wt% and Yb 0.15-0.19 wt%% unavoidable impurities<0.1 percent and the balance of Al. The method comprises the following steps: after the alloy casting is finished and homogenized and the solution treatment is finished, aging is carried out for 80-100 ℃/7-12 days, so that the alloy hardness reaches more than 70HV, and compared with the solid solution state hardness, the alloy hardness is improved by more than 1 time.
Description
Technical Field
The invention belongs to the technical field of nonferrous metals, and particularly relates to an aging treatment process for an Al-Li-Yb alloy.
Background
The aluminum lithium alloy is widely applied to the field of aerospace, and has the main characteristics of low density, high elastic modulus, high specific strength and specific rigidity, good fatigue and welding performance and the like. These excellent properties result mainly from the addition of the alloying element Li. The density can be reduced by 3 percent and the elastic modulus can be improved by 6 percent when 1 percent of Li is added into the aluminum alloy, and the hardness of the alloy is improved by solid solution strengthening and dispersion strengthening. The Al-Li alloy is adopted to replace the conventional high-strength aluminum alloy, so that the structural mass can be reduced by 10-20%, for example, in the airbus A380, the Al-Li2050, 2189 and 2199 plates replace the conventional AA2024, AA2324 and AA7150 alloys to be applied to positions of wing stringers, fuselage skins and the like. In the C-17 transportation helicopter, the Al-Li2050 and 8090 plates replace AA7075 alloy to be used as structural materials of a fuselage skin and a cabin body.
The second generation Al-Li alloy mainly adopts metastable L12Structural Al3Li is taken as a strengthening phase, thereby generating obvious aging strengthening effect. When the Li content is increased to 2.1 Liwt%, the alloy can be aged at 150-200 ℃ and the hardness at the peak of the aging can exceed 100 HV. 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, and when the content of Li in the alloy is increased, the burning loss of the Li element is increased and oxide inclusions are increased, so that the production difficulty of the alloy is greatly increased. Meanwhile, the aging temperature is higher corresponding to higher Li content, and a large-size AlLi equilibrium phase is easily formed at a crystal boundary, so thatThis results in a distinct precipitate-free zone (PFZ) near the grain boundaries, which affects the ductility and toughness of the alloy. When the Li content is reduced to 1.5 wt% or less, the Al content is reduced due to Al3The Li phase is a metastable structure, the driving force is low, the precipitated phase is difficult to disperse and precipitate, and the obvious strengthening effect cannot be generated.
To solve the problem of low Al3The problem of difficult Li phase precipitation is that in recent years, Sc is added to an aluminum-lithium binary alloy to form stable L1 with a matrix at the temperature of 300-450 DEG C2Structural Al3A precipitated phase of Sc. When the alloy is subjected to secondary aging at 200 ℃, Al can be induced3Li is precipitated to form Al3Sc as core, Al3Li is a core-shell structure of a shell layer. However, Sc is expensive and difficult to industrialize, and has stable L1 similar to Sc2The structural elements are Er and Yb, wherein the precipitation temperature of Yb element is much lower than that of Sc element, and the precipitation temperature of Li element is best matched. This patent designed the time-efficient heat treatment process for such Al-Li-Yb alloys with Li contents as low as 1.2-1.5 wt%.
Disclosure of Invention
The invention provides an aging treatment process of an Al-Li-Yb alloy with low Li content, which can enable the alloy hardness to reach more than 70 HV.
The invention provides an aging treatment process for an Al-Li-Yb alloy, which comprises the following components, by mass, 1.2% -1.5% of Li, 0.15% -0.19% of Yb, less than 0.1% of unavoidable impurities, and the balance of Al. After the alloy is cast, homogenized and the solution treatment is finished, the aging treatment is carried out for 5 minutes to 12 days in the range of room temperature to 160 ℃.
The time effect treatment is preferably carried out on the alloy at the temperature of 80-100 ℃/7-12 days, the alloy hardness reaches more than 70HV, and compared with the solid solution state hardness, the hardness is improved by more than 1 time.
The technical scheme of the invention has the advantages that:
by using the aging treatment process of the Al-Li-Yb alloy, the alloy hardness can reach more than 70HV by aging treatment at 80-100 ℃/7-12 days, and is improved by more than 1 time compared with the solid solution state hardness.
Drawings
FIG. 1 shows the natural aging hardness curve of Al-1.35Li-0.17Yb alloy at 25 deg.C
FIG. 2 is an age-hardness curve of Al-1.35Li-0.17Yb alloy at 80 deg.C
FIG. 3 is the aging hardness curve of Al-1.35Li-0.17Yb alloy at 100 deg.C
FIG. 4 is the aged hardness curve of Al-1.35Li-0.17Yb alloy at 120 deg.C
FIG. 5 is an age-hardness curve of Al-1.35Li-0.17Yb alloy at 160 deg.C
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.
Example 1
The components of the alloy are Li 1.35%, Yb 0.17%, unavoidable impurities less than 0.1% and Al in balance by mass percent. The method comprises the following steps: after the alloy casting is finished, the alloy is subjected to 580 ℃/24h +620 ℃/24h double-stage solution treatment and then aged at 80 ℃, the hardness curve is shown in figure 2, the alloy hardness reaches more than 70HV after 7-12 days of aging, and the maximum hardness is about 75 HV.
Example 2
The alloy has the same components as example 1, and is aged at 100 ℃ after casting, homogenization and solution treatment, the hardness curve is shown in figure 3, the alloy hardness reaches more than 70HV after 6-12 days of aging, and the hardness is about 75HV at most.
Comparative example 1
The alloy compositions were the same as in example 1, the alloy was cast, homogenized, solution treated and aged at room temperature (25 ℃), the hardness curve is shown in FIG. 1, and the maximum value of hardness was only 43HV within 12 days.
Comparative example 2
The compositions of the alloy were the same as in example 1, the alloy was cast, homogenized and solution treated and then aged at 120 ℃ and the hardness curve is shown in fig. 4, where the hardness reached a maximum of 68HV at 3 days, after which the hardness decreased with increasing aging time.
Comparative example 3
The compositions of the alloy are the same as in example 1, the alloy is aged at 160 ℃ after casting, homogenization and solution treatment, the hardness curve is shown in figure 5, the hardness value reaches a maximum value of 45HV in 2 days, and then the hardness value is slowly reduced along with the increase of the aging time.
Claims (2)
1. An aging treatment process for Al-Li-Yb alloy, which comprises the following components by mass percent of Li 1.2-1.5%, Yb 0.15-0.19%, unavoidable impurities less than 0.1%, and the balance of Al, and is characterized in that: after the alloy casting is finished, the solution treatment of 580 ℃/24h +620 ℃/24h is carried out, and then the natural aging and the aging treatment of 5 minutes to 12 days at the temperature of 80 ℃ to 160 ℃ are carried out.
2. The aging treatment process of the Al-Li-Yb alloy as claimed in claim 1, wherein the aging treatment is carried out at 80-100 ℃ for 7-12 days.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910191406.5A CN109881129B (en) | 2019-03-14 | 2019-03-14 | Aging treatment process for Al-Li-Yb alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910191406.5A CN109881129B (en) | 2019-03-14 | 2019-03-14 | Aging treatment process for Al-Li-Yb alloy |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109881129A CN109881129A (en) | 2019-06-14 |
| CN109881129B true CN109881129B (en) | 2020-08-28 |
Family
ID=66932304
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910191406.5A Active CN109881129B (en) | 2019-03-14 | 2019-03-14 | Aging treatment process for Al-Li-Yb alloy |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109881129B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020169014A1 (en) * | 2019-02-22 | 2020-08-27 | 北京工业大学 | Yb-microalloyed ai-li alloy |
| CN110438376A (en) * | 2019-08-13 | 2019-11-12 | 北京工业大学 | A kind of Al-Mg-Li alloy of Yb microalloying |
| CN110423964A (en) * | 2019-08-13 | 2019-11-08 | 北京工业大学 | A kind of Al-Mg-Li-Yb alloy aging treatment process |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8409497B2 (en) * | 2009-10-16 | 2013-04-02 | United Technologies Corporation | Hot and cold rolling high strength L12 aluminum alloys |
| DE102013012259B3 (en) * | 2013-07-24 | 2014-10-09 | Airbus Defence and Space GmbH | Aluminum material with improved precipitation hardening, process for its production and use of the aluminum material |
| US10900102B2 (en) * | 2016-09-30 | 2021-01-26 | Honeywell International Inc. | High strength aluminum alloy backing plate and methods of making |
| CN106591632B (en) * | 2016-12-07 | 2018-08-28 | 中国航空工业集团公司北京航空材料研究院 | A kind of heat treatment process improving aluminium lithium alloy comprehensive performance |
| CN107881371B (en) * | 2017-11-09 | 2020-07-14 | 上海交通大学 | Method for improving plasticity of cast aluminum lithium alloy |
| CN108193151B (en) * | 2018-03-28 | 2020-02-14 | 北京工业大学 | Aging treatment process for Al-Er-Li alloy |
| CN108570579A (en) * | 2018-04-11 | 2018-09-25 | 上海交通大学 | A kind of scandium-containing casting aluminium lithium alloy and preparation method thereof |
-
2019
- 2019-03-14 CN CN201910191406.5A patent/CN109881129B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN109881129A (en) | 2019-06-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109881129B (en) | Aging treatment process for Al-Li-Yb alloy | |
| EP2964799B1 (en) | Product from heat treatable aluminum alloys having magnesium and zinc | |
| CA2901879C (en) | Improved aluminum-magnesium-lithium alloys, and methods for producing the same | |
| RU2404276C2 (en) | PRODUCT FROM HIGH-STRENGTH, HIGH-VISCOSITY Al-Zn ALLOY AND MANUFACTURING METHOD OF SUCH PRODUCT | |
| US5219521A (en) | Alpha-beta titanium-base alloy and method for processing thereof | |
| CN110423927A (en) | A kind of Ultrahigh strength aluminum lithium alloy and preparation method thereof | |
| GB2470613A (en) | A precipitation hardened, near beta Ti-Al-V-Fe-Mo-Cr-O alloy | |
| CN108048716A (en) | High-strength creep resistant Al-Cu containing scandium line aluminium alloys and casting and heat treatment process | |
| CN110331319B (en) | High-strength and high-plasticity corrosion-resistant aluminum alloy containing scandium and erbium and preparation method thereof | |
| CN109666830B (en) | Wrought aluminum-lithium-copper-zinc alloy and preparation method thereof | |
| CN110541096A (en) | High-strength easy-to-weld Al-Mg-Zn-Cu alloy and preparation method thereof | |
| CN106702235B (en) | A kind of high-strength high-fracture toughness aluminium alloy | |
| CN108330360B (en) | high-Zn-content high-strength-toughness extrusion deformation aluminum-lithium alloy and preparation method thereof | |
| CN111363961A (en) | Er-containing high-Li-content light low-cost high-toughness aluminum lithium alloy | |
| CN112795797B (en) | Method for preparing high-strength and high-toughness aluminum-based high-entropy alloy composite strip | |
| US11351585B2 (en) | Preparation method for a high-strength extruded profile of Mg—Zn—Sn—Mn alloy | |
| CN106756342A (en) | A kind of heat-treatable strengthened high strength high toughness casting aluminum alloy and preparation method | |
| CN112795811A (en) | Polycrystalline multiphase reinforced heat-resistant titanium alloy and preparation method thereof | |
| CN110453162B (en) | Three-stage homogenization treatment process for Al-Mg-Li-Yb alloy | |
| CN115710661B (en) | Al-Zn-Mg-Cu aluminum alloy and method for improving stress corrosion performance thereof | |
| JPH0610087A (en) | High strength superplastic aluminum alloy excellent in corrosion resistance and its manufacture | |
| US10273564B2 (en) | Aluminium based alloys for high temperature applications and method of producing such alloys | |
| CN110423964A (en) | A kind of Al-Mg-Li-Yb alloy aging treatment process | |
| CN118685660A (en) | Metastable beta-type titanium alloy and preparation method thereof | |
| JPS6086249A (en) | Preparation of super-plastic aluminum alloy |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |