Ageing treatment process for Al-Er-Li alloy

An al-er-li and aging treatment technology, which is applied in the field of Al-Er-Li alloy aging treatment technology, can solve the problems of slow diffusion of Sc and inability to further improve the strength of Al-Li alloy.

Active Publication Date: 2018-06-22
BEIJING UNIV OF TECH
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Problems solved by technology

However, due to the slow diffusion rate of Sc, when the Al-Sc-Li alloy is subjected to single-stage isothermal aging directly, 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.

Method used

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  • Ageing treatment process for Al-Er-Li alloy
  • Ageing treatment process for Al-Er-Li alloy
  • Ageing treatment process for Al-Er-Li alloy

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Experimental program
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Embodiment 1

[0015] The mass percentage of each component of the alloy is Er 0.19%, Li 2.1%, the content of unavoidable magazine is less than 0.1%, and the balance is Al. After smelting to obtain an ingot, it is subjected to solution treatment (first-level solution treatment at 580°C / 24h, and then solution treatment at 640°C / 24h).

[0016] The solution-treated samples were subjected to isothermal aging treatment at 175, 190, and 200 °C, and their mechanical properties were characterized by microhardness. The hardness curves of Al-Er-Li alloy at 175, 190, and 200 °C were obtained. like figure 1 shown.

[0017] Depend on figure 1 It can be seen that the peak aging hardness of Al-Er-Li alloy after isothermal aging treatment at 175 ℃, 190 ℃ and 200 ℃ remains at 104HV.

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Abstract

The invention discloses an ageing treatment process for an Al-Er-Li alloy, and belongs to the technical field of non-ferrous metals. The alloy consists of the following components in percentage by mass: 0.1-0.19% of Er, 2.0-2.1% of Li, less than 0.1% of inevitable impurities and the balance Al. The ageing treatment process comprises the following steps of: casting the Al-Er-Li alloy, performing solid-solution treatment, and performing equal-temperature aging treatment for 24-48 hours at a temperature of 175-200 DEG C. After treated by the process, the Al-Er-Li alloy has peak ageing hardness which is kept to be higher than 100 HV.

Description

technical field [0001] The invention belongs to the technical field of non-ferrous metals, and in particular relates to an Al-Er-Li alloy aging treatment process. Background technique [0002] Aluminum-lithium alloys have received extensive attention in aerospace due to their low density, high elastic modulus, and high specific strength. The strengthening effect of aluminum-lithium alloy mainly comes from the L1 2 Structure of Al 3 Li metastable phase, due to Al 3 Li is a metastable phase, so the precipitation driving force during the aging process is small, especially when the aging temperature is high, so that the aging strength of the Al-Li alloy is more sensitive to temperature. When the Al-Li alloy is isothermally aged at 150 °C, it needs to It takes two months to reach peak aging, and when aging at 200 °C, the time to reach peak aging is greatly shortened, but the aging hardness is greatly reduced, so that the Al-Li alloy aging treatment temperature process window i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/04C22C21/00
CPCC22C21/00C22F1/04
Inventor 高坤元刘琦兵丁宇升聂祚仁黄晖文胜平吴晓蓝
Owner BEIJING UNIV OF TECH
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