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A two-stage solid solution treatment process for al-er-li alloy

An al-er-li, two-stage solid solution technology, applied in the field of non-ferrous metals, can solve problems such as low solid solubility, low solid solubility, and inability to precipitate Er

Active Publication Date: 2019-12-20
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The strength of Al-Li alloy can be further improved by adding microalloying element Er, but Er has a low solid solubility in Al, and its solid solubility is only 0.046at.% at 640°C. Conventional Al- The solution treatment temperature of Li alloys is lower than 600 °C, and at this temperature, the solid solubility of Er in Al is extremely low, so that Er cannot be precipitated during the subsequent aging process.

Method used

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  • A two-stage solid solution treatment process for al-er-li alloy
  • A two-stage solid solution treatment process for al-er-li alloy
  • A two-stage solid solution treatment process for al-er-li alloy

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Experimental program
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Embodiment 1

[0018] The mass percentages of each component of the alloy are Er 0.19%, Li 2.1%, unavoidable impurities < 0.1%, and the balance Al, and the ingot is obtained by melting.

[0019] The ingot was firstly subjected to primary solution treatment at 580°C / 24h, and then continued to heat up to 640°C, followed by secondary solution treatment for 24h, the alloy was corroded by Keller reagent for 3min, and its structure was observed by metallographic microscopy, as shown in figure 1 shown.

[0020] Depend on figure 1 It can be seen that after the alloy has undergone two-stage solution treatment at 580°C / 24h+640°C / 24h, there is no overburned structure such as redissolved balls on the grain boundary, indicating that after the two-stage solution treatment process, the alloy has not been overburned . SEM observation and energy spectrum analysis were carried out on the alloy after the two-stage solid solution treatment, such as figure 2 shown by figure 2 It can be seen that only a sma...

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Abstract

The invention discloses an Al-Er-Li alloy two-stage solid solution treatment process and belongs to the technical field of nonferrous metals. The alloy comprises the following components in percentageby mass: 0.1-0.19% of Er, 2.0-2.1% of Li, less than 0.1% of inevitable impurity content and the balance of Al. The process comprises the following steps: after casting completion of an Al-Er-Li alloy, performing 580 DEG C / 24h primary solid solution treatment, and performing 640 DEG C / 24h solid solution treatment. According to the process, the aim of reaching high Er content in the solid solutionon premise of not over-burning the alloy is achieved by virtue of two-stage solid solution treatment, and enough driving force is provided for separating out the Er in a subsequent aging process.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metals, and in particular relates to a two-stage solid solution treatment process for Al-Er-Li alloys. Background technique [0002] Al-Li alloys have received extensive attention in aerospace due to their low density, high elastic modulus, and high specific strength. For every 1% Li added to aluminum, the density of the aluminum alloy can be reduced by 3%, and the modulus can be increased by 6%. According to calculations, if advanced aluminum-lithium alloys are used to replace traditional aluminum alloys to manufacture Boeing aircraft, the structural weight can be reduced by 14.6%, fuel savings by 5.4%, aircraft costs by 2.1%, and the annual flight cost of each aircraft will be reduced by 2.2%. For every 1kg lighter, the launch cost can save 20,000 US dollars. Therefore, aluminum-lithium alloys are of great significance in the aerospace field. [0003] The strengthening effect of aluminum-li...

Claims

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Application Information

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Patent Type & Authority Patents(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