CN108193151B - Aging treatment process for Al-Er-Li alloy - Google Patents

Aging treatment process for Al-Er-Li alloy Download PDF

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Publication number
CN108193151B
CN108193151B CN201810261161.4A CN201810261161A CN108193151B CN 108193151 B CN108193151 B CN 108193151B CN 201810261161 A CN201810261161 A CN 201810261161A CN 108193151 B CN108193151 B CN 108193151B
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alloy
treatment
aging
aging treatment
isothermal
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CN108193151A (en
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高坤元
刘琦兵
丁宇升
聂祚仁
黄晖
文胜平
吴晓蓝
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Beijing University of Technology
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Beijing University of Technology
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22FCHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C21/00Alloys based on aluminium

Abstract

An aging treatment process of Al-Er-Li alloy, which belongs to the technical field of nonferrous metals. The alloy comprises the following components in percentage by mass, Er0.1-0.19%, Li2.0-2.1%, unavoidable impurity content less than 0.1%, and the balance Al, and comprises the following steps: after the Al-Er-Li alloy is cast and subjected to solid solution treatment, isothermal aging treatment is carried out for 175-200 ℃/24-48h, and the peak aging hardness of the Al-Er-Li alloy can be kept above 100HV after the isothermal aging treatment.

Description

Aging treatment process for Al-Er-Li alloy
Technical Field
The invention belongs to the technical field of nonferrous metals, and particularly relates to an aging treatment process of an Al-Er-Li alloy.
Background
The aluminum lithium alloy has attracted extensive attention in the aspects of aerospace due to the characteristics of low density, high elastic modulus and high specific strength. The strengthening effect of the aluminum-lithium alloy is mainly derived from the alloy with L12Structural Al3Metastable phase of Li due to Al3Li is a metastable phase, so the precipitation driving force is small in the aging process, particularly when the aging temperature is high, the aging strength of the Al-Li alloy is sensitive to the temperature, the Al-Li alloy needs two months to reach the peak aging when subjected to isothermal aging at 150 ℃, the time for reaching the peak aging is greatly shortened when subjected to 200 ℃, but the aging hardness is greatly reduced, so that the aging treatment temperature process window of the Al-Li alloy is narrow, and the heat treatment temperature range of the Al-Li alloy is limited. The strength of the Al-Li alloy can be further improved by adding micro-alloying elements such as Sc, Er and the like into the Al-Li alloy, namely Al-Sc-Lin the i system, Al precipitated in advance can be precipitated in a two-stage aging treatment mode3Sc as Al3Core of Li heterogeneous nucleation, promoting Al3The precipitation of Li further improves the strength of the Al-Li alloy. However, because the Sc diffusion speed is low, when the Al-Sc-Li alloy is directly subjected to single-stage isothermal aging, the hardness of the Al-Sc-Li alloy is consistent with that of the Al-Li alloy, and the strength of the Al-Li alloy cannot be further improved. Er has the similar property with Sc, is cheaper than Sc, and can further improve the strength of the Al-Li alloy by adding Er element into the Al-Li alloy. The invention researches an aging treatment process of the Al-Er-Li alloy to obtain a process window that the Al-Er-Li alloy can keep a higher hardness value.
Disclosure of Invention
The invention aims to provide an aging treatment process for an Al-Er-Li alloy, which can keep the hardness value of the Al-Er-Li alloy above 100 HV.
The invention provides an Al-Er-Li alloy aging treatment process, which comprises the following steps of respectively 0.1-0.19% of Er0.0-2.1% of Li2.0-2.1% of unavoidable impurity content, and the balance of Al, in percentage by mass: smelting to obtain an ingot, carrying out solution treatment, carrying out isothermal aging treatment at the temperature of 175-96 h and 210 ℃/5min, and representing the mechanical properties of the alloy through microhardness.
Further preferably, the solution treatment: first stage solution treatment is carried out at 580 ℃/24h, and then solution treatment is carried out at 640 ℃/24 h.
The invention researches the aging treatment process of the Al-Er-Li alloy, and after the Al-Er-Li alloy is subjected to isothermal aging treatment at the temperature of 200 ℃/24h-48h by 175-.
The technical scheme of the invention has the advantages that:
firstly, carrying out solid solution treatment on the Al-Er-Li alloy, wherein firstly, the phenomenon of overburning of the alloy is required to be ensured in the solid solution treatment process; secondly, as much as possible of the solid-soluted Er element is required. According to the solid solubility of Er in Al at different temperatures, the solid solution temperature corresponding to Er with the content of 0.19 percent is about 630 ℃, and considering that the solid solubility of Er can be reduced by adding Li, the solid solution treatment temperature is increased to 640 ℃ so as to achieve the purpose of fully dissolving Er element, but after the Al-Er-Li alloy is directly subjected to the solid solution treatment at 640 ℃, the serious overburning phenomenon of the alloy can occur. Therefore, a two-stage solution treatment mode is adopted, firstly, the Al-Li and Al-Er eutectic structures on the grain boundary are re-dissolved through the primary solution treatment of 580 ℃/24h, and then, the secondary solution treatment of 640 ℃/24h is carried out, so that the Al-Er is re-dissolved in one phase, and the aim of obtaining the Er content with higher solid solution component on the premise of ensuring that the alloy is not over-sintered is fulfilled.
By adopting the aging treatment process for the Al-Er-Li alloy, the peak aging hardness of the Al-Er-Li alloy can be kept above 100HV particularly after the isothermal aging treatment at 175-200 ℃/24-48 h.
Drawings
FIG. 1 is a hardness curve of Al-Er-Li alloy after isothermal aging treatment at 175 deg.C, 190 deg.C and 200 deg.C;
FIG. 2 is a hardness curve of Al-Er-Li alloy after isothermal aging treatment at 210 ℃;
FIG. 3 shows the peak aging hardness of Al-Li alloy after isothermal aging treatment at 190 ℃ and 200 ℃;
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings, but the invention is not limited to the following examples:
example 1:
the alloy comprises 0.19% of Er, 2.1% of Li, less than 0.1% of unavoidable impurities and the balance of Al. After the ingot is obtained by smelting, the ingot is subjected to solution treatment (first stage solution treatment at 580 ℃/24h, and then solution treatment at 640 ℃/24 h).
Isothermal aging treatment is carried out on the sample after the solution treatment at 175, 190 and 200 ℃, and the mechanical property of the sample is characterized by microhardness, so that a hardness curve of the Al-Er-Li alloy at 175, 190 and 200 ℃ is obtained, as shown in figure 1.
As is clear from FIG. 1, the Al-Er-Li alloy maintained its peak aged hardness at 104HV after isothermal aging at 175 deg.C, 190 deg.C and 200 deg.C.
Comparative example 1:
the alloy material used was the same as in example 1.
After the solution treatment, isothermal aging treatment was performed on the Al-Er-Li alloy at 210 ℃ to obtain a hardness curve, as shown in FIG. 2.
As can be seen from FIG. 2, the alloy after 210 ℃ isothermal aging treatment reaches peak aging at 12h, and the hardness value is only 90HV, which is lower by 14HV compared with the peak aging hardness 104HV at 175, 190 and 200 ℃ isothermal aging.
Comparative example 2:
the material is Al-Li alloy, and the Li component is the same as Al-Er-Li alloy.
The Al-Li alloy is subjected to solution treatment and then isothermal aging treatment at 190 ℃ and 200 ℃ to obtain the peak aging hardness value, as shown by the black curve in FIG. 3.
As can be seen from FIG. 3, the peak hardness values of the Al-Li alloy after isothermal aging treatment at 190 ℃ and 200 ℃ are respectively 98HV and 90HV, and the peak hardness values are respectively reduced by 6HV and 14HV compared with the peak hardness values of the Al-Er-Li alloy after isothermal aging treatment at 175 ℃, 190 ℃ and 200 ℃ of 104 HV.
In summary, the aging treatment process of the Al-Er-Li alloy provided by the invention comprises the following steps: the Al-Er-Li alloy can keep the hardness above 100HV in the aging temperature range of 175-.

Claims (2)

1. An Al-Er-Li alloy aging treatment process is characterized in that the Al-Er-Li alloy aging treatment process comprises the following steps of, by mass, Er0.1-0.19%, Li2.0-2.1%, unavoidable impurity content less than 0.1%, and the balance Al: smelting to obtain an ingot, and carrying out isothermal aging treatment at the temperature of 175-96 h and 210 ℃/5min after solution treatment;
solution treatment: first stage solution treatment is carried out at 580 ℃/24h, and then solution treatment is carried out at 640 ℃/24 h.
2. The aging treatment process of Al-Er-Li alloy as claimed in claim 1, wherein the Al-Er-Li alloy is subjected to solution treatment and isothermal aging treatment at 200 ℃/24-48h for 175-.
CN201810261161.4A 2018-03-28 2018-03-28 Aging treatment process for Al-Er-Li alloy Active CN108193151B (en)

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CN109881129B (en) * 2019-03-14 2020-08-28 北京工业大学 Aging treatment process for Al-Li-Yb alloy

Citations (5)

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Publication number Priority date Publication date Assignee Title
US5076859A (en) * 1989-12-26 1991-12-31 Aluminum Company Of America Heat treatment of aluminum-lithium alloys
CN1140474A (en) * 1994-12-10 1997-01-15 英国空间公共有限公司 Heat treatment of aluminium-lithium alloys
CN102021443A (en) * 2010-10-15 2011-04-20 北京工业大学 Al-Er-Zr alloy and ageing strengthening process thereof
CN104451272A (en) * 2014-11-21 2015-03-25 上海交通大学 Light-weight and high-strength cast aluminum lithium alloy and preparation method thereof
CN105441745A (en) * 2014-09-30 2016-03-30 黄晓艺 Al-Li alloy material and preparation treatment process thereof

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CA1280341C (en) * 1985-11-21 1991-02-19 R. Eugene Curtis Low temperature underaging of lithium bearing alloys

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Publication number Priority date Publication date Assignee Title
US5076859A (en) * 1989-12-26 1991-12-31 Aluminum Company Of America Heat treatment of aluminum-lithium alloys
CN1140474A (en) * 1994-12-10 1997-01-15 英国空间公共有限公司 Heat treatment of aluminium-lithium alloys
CN102021443A (en) * 2010-10-15 2011-04-20 北京工业大学 Al-Er-Zr alloy and ageing strengthening process thereof
CN105441745A (en) * 2014-09-30 2016-03-30 黄晓艺 Al-Li alloy material and preparation treatment process thereof
CN104451272A (en) * 2014-11-21 2015-03-25 上海交通大学 Light-weight and high-strength cast aluminum lithium alloy and preparation method thereof

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