CN109881129A - A kind of Al-Li-Yb alloy aging treatment process - Google Patents
A kind of Al-Li-Yb alloy aging treatment process Download PDFInfo
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Abstract
A kind of Al-Li-Yb alloy aging treatment process, belongs to non-ferrous metal technical field.Induction Al is added by microalloy element Yb element3The precipitation of Li hardening constituent allows alloy to generate apparent strengthening effect by ageing treatment.The each component of alloy is respectively Li 1.2%~1.5%, Yb 0.15%~0.19%, inevitable impurity < 0.1%, surplus Al by mass percentage.Step are as follows: alloy casting is completed, and after homogenizing and completing solution treatment, 80 DEG C of -100 DEG C/7-12 days timeliness improve 1 times or more compared to solid solution state hardness so that alloy rigidity reaches 70HV or more.
Description
Technical field
The invention belongs to non-ferrous metal technical fields, and in particular to a kind of Al-Li-Yb alloy aging treatment process.
Background technique
Aluminium lithium alloy is extensive in field of aerospace, and main feature includes that density is low, elasticity modulus height, specific strength and ratio
High, tired and good welding performance of rigidity etc..These excellent performances are mainly derived from the addition of alloying element Li.Every addition 1%
Li enter can be reduced in aluminium alloy 3% density, improve 6% elasticity modulus, while mentioning by solution strengthening and dispersion-strengtherning
High alloy hardness.Architecture quality mitigation 10%~20% can be made using the aluminium alloy of Al-Li alloy replacing conventional High Intensity, such as
In Air Passenger A380,2050,2189 and 2199 plate of Al-Li is answered instead of traditional AA2024, AA2324 and AA7150 alloy
For positions such as wing stringer and fuselage skins.In C-17 transport helicopter, Al-Li2050 and 8090 plates instead of
AA7075 alloy is as fuselage skin, the structural material of cabin.
Second generation Al-Li alloy mainly uses metastable L12The Al of structure3Li is as hardening constituent, to generate apparent timeliness
Strengthening effect.When Li content is increased to 2.1Liwt%, alloy can surpass in 150-200 DEG C of timeliness, the hardness of timeliness peak value
Cross 100HV.But with the increase of Li content, a series of difficulties can be brought to the production and application of aluminium lithium alloy.Firstly, Li makees
For the element that a kind of chemical property is very active, when content increases Li in the alloy, Li melting loss of elements becomes larger and oxide presss from both sides
It is miscellaneous to increase therewith, cause the production difficulty of alloy to greatly increase.Meanwhile the higher corresponding aging temp of Li content is higher, crystal boundary
Place easily forms large scale AlLi and balances phase, this will lead to crystal boundary and nearby generates apparent precipitate-free zone (PFZ), influences the modeling of alloy
Property toughness.When reducing Li content to 1.5wt% or less, due to Al3Li phase is metastable structure, and driving force is lower, and precipitated phase is difficult
With disperse educt, apparent strengthening effect can not be generated.
In order to solve low Al3Li phase is difficult to the problem of being precipitated, in recent years middle addition Sc on the basis of Al-Li alloy
It can be formed to have with matrix at 300-450 DEG C and stablize L12The Al of structure3Sc precipitated phase.When alloy carries out 200 DEG C of the second level again
When timeliness, Al can be induced3Li is precipitated, to form Al3Sc is core, Al3Li is the core-shell structure of shell.But Sc price
It is expensive, it is difficult to which that realizing that industrialization is identical with Sc has stable L12There are also Er and Yb, the wherein analysis of Yb element for the element of structure
Temperature ratio Sc is much lower out and the Precipitation Temperature of Li element is matched best.This patent is directed to this Li content down to 1.2-
The Al-Li-Yb alloy of 1.5wt%, designs its aging thermal treating process.
Summary of the invention
The present invention provides a kind of Al-Li-Yb alloy aging treatment process of low Li content, which can be such that alloy rigidity reaches
To 70HV or more.
A kind of Al-Li-Yb alloy aging treatment process provided by the invention, each component of alloy are distinguished by mass percentage
For Li 1.2%~1.5%, Yb 0.15%~0.19%, inevitable impurity < 0.1%, surplus Al.Alloy casting is completed,
After homogenizing and completing solution treatment, in room temperature to carrying out 5 minutes to 12 days ageing treatments within the scope of 160 DEG C.
Alloy preferably 80 DEG C of -100 DEG C/7-12 days ageing treatments, alloy rigidity reach 70HV or more, compared to solid solution state hardness
Promote 1 times or more.
The advantages of technical solution of the present invention, is:
Using a kind of Al-Li-Yb alloy aging treatment process provided by the invention, in 80 DEG C of -100 DEG C/7-12 days timeliness
Processing can make alloy rigidity reach 70HV or more, promote 1 times or more compared to solid solution state hardness.
Detailed description of the invention
Figure 1A l-1.35Li-0.17Yb alloy is in 25 DEG C of natrual ageing hardness curves
Fig. 2A l-1.35Li-0.17Yb alloy is in 80 DEG C of timeliness hardness curves
Fig. 3 Al-1.35Li-0.17Yb alloy is in 100 DEG C of timeliness hardness curves
Fig. 4 Al-1.35Li-0.17Yb alloy is in 120 DEG C of timeliness hardness curves
Fig. 5 Al-1.35Li-0.17Yb alloy is in 160 DEG C of timeliness hardness curves
Specific embodiment
Invention is further elaborated with reference to the accompanying drawings and embodiments, but the present invention is not limited to following embodiments.
Embodiment 1
The each component of alloy by mass percentage be respectively Li 1.35%, Yb 0.17%, inevitable impurity < 0.1%,
Surplus is Al.Step are as follows: alloy casting is completed, after carrying out 580 DEG C /+620 DEG C for 24 hours/double_stage guide processing for 24 hours later, at 80 DEG C
Timeliness, for hardness curve as shown in Fig. 2, alloy rigidity reaches 70HV or more after timeliness 7-12 days, hardness is up to about 75HV.
Embodiment 2
The each component of alloy is same as Example 1, and alloy casting is completed, and homogenizes and completes after solution treatment at 100 DEG C
Timeliness, for hardness curve as shown in figure 3, alloy rigidity reaches 70HV or more after timeliness 6-12 days, hardness is up to about 75HV.
Comparative example 1
The each component of alloy is same as Example 1, and alloy casting is completed, and homogenizes and completes after solution treatment in room temperature
(25 DEG C) timeliness, hardness curve is as shown in Figure 1, maximum hardness is only 43HV in 12 days.
Comparative example 2
The each component of alloy is same as Example 1, and alloy casting is completed, and homogenizes and completes after solution treatment at 120 DEG C
Timeliness, hardness curve is as shown in figure 4, hardness number reached maximum value 68HV at 3 days, later with the extension hardness number of aging time
Decline therewith.
Comparative example 3
The each component of alloy is same as Example 1, and alloy casting is completed, and homogenizes and completes after solution treatment at 160 DEG C
Timeliness, hardness curve is as shown in figure 5, hardness number reached maximum value 45HV at 2 days, later with the extension hardness number of aging time
Slowly decline therewith.
Claims (2)
1. a kind of Al-Li-Yb alloy aging treatment process, each component of alloy be respectively by mass percentage Li 1.2%~
1.5%, Yb 0.15%~0.19%, inevitable impurity < 0.1%, surplus Al, it is characterised in that: alloy casting is completed
Afterwards, 580 DEG C /+620 DEG C for 24 hours/solution treatment for 24 hours is carried out, has carried out within the scope of natrual ageing and 80 DEG C -160 DEG C 5 points later
Clock was to 12 days ageing treatments.
2. according to a kind of Al-Li-Yb alloy aging treatment process of claim 1, which is characterized in that at 80-100 DEG C
Ageing treatment 7~12 days.
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| CN110438376A (en) * | 2019-08-13 | 2019-11-12 | 北京工业大学 | A kind of Al-Mg-Li alloy of Yb microalloying |
| WO2020169014A1 (en) * | 2019-02-22 | 2020-08-27 | 北京工业大学 | Yb-microalloyed ai-li alloy |
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