In-situ preparation method for micrometer scale T1 phase based on Al-Cu-Li alloy

An in-situ preparation, al-cu-li technology, applied in the field of aluminum alloy heat treatment, can solve the problems of uniformity, difference in oxide film alloy matrix, inability to achieve crystal structure and atomic arrangement, etc., to increase the holding temperature and eliminate elements The effect of segregation

Active Publication Date: 2018-03-30
CHONGQING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, because aviation aluminum alloys generally have to be anodized before they can be put into use, and T 1 The phase contains a lot of Cu and Li elements, so T 1 The anodic oxidation behavior and T 1 The structure of the oxide film formed on the phase should be significantly different from that of the alloy matrix
[0003] Although T 1 The corrosion and electrochemical behavior of phases have a significant impact on the structural properties of Al-Li alloys and their coatings, but due to the T in practically used commercial alloys 1 The size of the phase is very small, generally 100-200nm, and people have not been able to directly study the T 1 Corrosion and electrochemical behavior of phases
Some researchers have formulated ingredients to form and T 1 consistent model alloy to study its corrosion and electrochemical behavior, but since the model alloy only differs from T in macroscopic composition 1 Consistent with each other, the crystal structure and atomic arrangement cannot be consistent, it can only be an approximate simulation, without really studying a single T 1 Mutually

Method used

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  • In-situ preparation method for micrometer scale T1 phase based on Al-Cu-Li alloy
  • In-situ preparation method for micrometer scale T1 phase based on Al-Cu-Li alloy
  • In-situ preparation method for micrometer scale T1 phase based on Al-Cu-Li alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1, a micron scale T based on Al-Cu-Li alloy 1 The in-situ preparation method of phase, it comprises the steps:

[0029] Step 1: Cut a 30×30×30mm sample from the AA2099 Al-Li alloy ingot by wire cutting method, put the AA2099 Al-Li alloy sample to be treated into a heat treatment furnace for solution treatment, and the solution treatment temperature is 540℃±5℃, solution treatment holding time is 1h;

[0030] Step 2, quenching the AA2099 aluminum-lithium alloy sample that has been solid solution treated, the quenching medium is water at 0°C, and the quenching transfer time is not greater than 10s;

[0031] Step 3: Put the quenched AA2099 aluminum-lithium alloy sample in a heat treatment furnace for graded heat treatment, the first heat treatment temperature is 500°C, the treatment time is 12h, the second heat treatment temperature is 520°C, and the treatment time is 36h, Then cooled to room temperature with the furnace, in situ prepared T with a longitudinal ...

Embodiment 2

[0032] Embodiment 2, a micron scale T based on Al-Cu-Li alloy 1 The in-situ preparation method of phase, it comprises the steps:

[0033] Step 1: Cut a 30×30×30mm sample from the AA2099 Al-Li alloy ingot by wire cutting method, put the AA2099 Al-Li alloy sample to be treated into a heat treatment furnace for solution treatment, and the solution treatment temperature is 540℃±5℃, solution treatment holding time is 3h;

[0034] Step 2, quenching the AA2099 aluminum-lithium alloy sample that has been solid solution treated, the quenching medium is water at 3°C, and the quenching transfer time is not greater than 10s;

[0035] Step 3: put the quenched AA2099 aluminum-lithium alloy sample in a heat treatment furnace for graded heat treatment, the first heat treatment temperature is 480°C, the treatment time is 18h, the second heat treatment temperature is 530°C, and the treatment time is 24h, Then cooled to room temperature with the furnace, in situ prepared T with a longitudinal ...

Embodiment 3

[0036] Example 3, a micron scale T based on Al-Cu-Li alloy 1 The in-situ preparation method of phase, it comprises the steps:

[0037] Step 1: Cut a 30×30×30 mm sample from the AA2055 Al-Li alloy ingot by wire cutting method, put the AA2055 Al-Li alloy sample to be treated into a heat treatment furnace for solution treatment, and the solution treatment temperature is 540℃±5℃, solution treatment holding time is 5h;

[0038] Step 2, quenching the AA2055 aluminum-lithium alloy sample that has undergone solid solution treatment, the quenching medium is water at 5°C, and the quenching transfer time is not greater than 10s;

[0039] Step 3: put the quenched AA2055 aluminum-lithium alloy sample in a heat treatment furnace for graded heat treatment, the first heat treatment temperature is 510°C, the treatment time is 24h, the second heat treatment temperature is 530°C, and the treatment time is 28h, Then cooled to room temperature with the furnace, in situ prepared T with a longitud...

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Abstract

The invention discloses an in-situ preparation method for a micrometer scale T1 phase based on Al-Cu-Li alloy. The method includes the following steps that first, an Al-Cu-Li alloy sample to be treated is put into a heat treatment furnace for solution treatment; second, the Al-Cu-Li alloy sample with solution treatment being completed is subjected to quenching treatment, the quenching medium refers to water of 0-5 DEG C, and the quenching transfer time is no longer than 10s; and third, the quenched Al-Cu-Li alloy sample is put into the heat treatment furnace for classified heat treatment, thenfurnace cooling is performed to an indoor temperature, and the T1 phase with the longitudinal dimensions being 5-10 microns is prepared in the Al-Cu-Li alloy in an in-situ mode. The micrometer scaleT1 phase can be prepared in the in-situ mode, and the corrosion and electrochemical behaviors of the single T1 phase can be better studied.

Description

technical field [0001] The invention relates to aluminum alloy heat treatment technology, in particular to an Al-Cu-Li alloy-based micron scale T 1 In situ preparation method of phase. Background technique [0002] The new aluminum-lithium alloy has many excellent properties such as high specific strength, specific stiffness, and good fatigue resistance. It is an advanced lightweight structural material that has developed most rapidly among aerospace materials in recent years. Due to the extremely active Li element, the corrosion potential difference between the Li-containing phase and the non-Li-containing phase and the Al matrix in the Al-Li alloy is large, which makes the new Al-Li alloy prone to localized corrosion. The new Al-Li alloy mainly forms δ' or Al during the aging process 3 Li, T 1 ie Al 2 CuLi, T 2 ie Al 6 CuLi 3 and θ' ie Al 2 Strengthening phases such as Cu, where δ' and T 1 It is the main aging strengthening phase in aluminum-lithium alloy. The δ'...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/057C22C21/16
CPCC22C21/16C22F1/002C22F1/057
Inventor 麻彦龙吴海鹏黄伟九王正曦梁钊源刘磊
Owner CHONGQING UNIV OF TECH
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