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Two-stage aging process of Al-5.6Zn-2.1Mg-1.2Cu-0.1Zr-0.1Er alloy

A dual-stage aging and process technology, applied in the field of non-ferrous metals, can solve problems such as the difficulty in achieving rapid temperature rise and the difficulty in ensuring the temperature consistency of the core and surface of components, and achieve good overall performance.

Inactive Publication Date: 2016-05-11
BEIJING UNIV OF TECH
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Problems solved by technology

[0005] At present, there has been research on the dual-stage aging heat treatment process for Al-5.6Zn-2.1Mg-1.2Cu-0.1Zr-0.1Er aluminum alloy (patent application number: 201510038958.4). The specific heat treatment steps are as follows: the aluminum alloy is solidified at 470°C Melt for 2 hours, then water-cooled and quenched at room temperature; the alloy after water quenching is subjected to double-stage aging treatment, the first-stage aging system is 105°C for 5 hours; h, the above heat treatment process is a rapid temperature rise process. In the actual industrial production process, the heat treatment alloy is mostly a large component profile, and it is difficult to achieve rapid temperature rise during the heat treatment process, and it is difficult to ensure the consistency of the core and surface temperature of the component

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0017] The Al-5.6Zn-2.1Mg-1.2Cu-0.1Zr-0.1Er aluminum alloy was subjected to solution treatment, raised from room temperature to 475°C, the heating rate was 2°C / min, kept for 2h, room temperature water cooling and quenching; and then carried out Two-stage aging heat treatment with slow temperature rise, the first stage of aging is raised from room temperature to 120°C, the heating rate is 1°C / min, and the temperature is kept for 5 hours; the second stage of aging is raised from 120°C to 150°C, and the heating rate is 1°C / min , heat preservation 0 ~ 36h.

Embodiment 2

[0019] The Al-5.6Zn-2.1Mg-1.2Cu-0.1Zr-0.1Er aluminum alloy was subjected to solution treatment, raised from room temperature to 475°C, the heating rate was 2°C / min, kept for 2h, room temperature water cooling and quenching; and then carried out Two-stage aging heat treatment with slow temperature rise, the first stage of aging is raised from room temperature to 120°C, the heating rate is 1°C / min, and the temperature is kept for 5 hours; the second stage of aging is raised from 120°C to 160°C, and the heating rate is 1°C / min , heat preservation 0 ~ 36h.

Embodiment 3

[0021] The Al-5.6Zn-2.1Mg-1.2Cu-0.1Zr-0.1Er aluminum alloy was subjected to solution treatment, raised from room temperature to 475°C, the heating rate was 2°C / min, kept for 2h, room temperature water cooling and quenching; and then carried out Two-stage aging heat treatment with slow temperature rise, the first stage of aging is raised from room temperature to 120°C, the heating rate is 1°C / min, and the temperature is kept for 5 hours; the second stage of aging is raised from 120°C to 170°C, and the heating rate is 1°C / min , heat preservation 0 ~ 36h.

[0022] Table 1 is the exfoliation corrosion resistance rating of the alloys corresponding to Examples 1, 2, and 3 after dual-stage aging treatment.

[0023] Table 1 Exfoliation Corrosion Resistance Rating of Alloys Corresponding to Examples 1, 2, and 3 After Double-Stage Aging Treatment

[0024]

[0025] It can be seen from Table 1 that the process window with good exfoliation corrosion resistance can be obtained after the...

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Abstract

The invention discloses a two-stage aging process of an Al-5.6Zn-2.1Mg-1.2Cu-0.1Zr-0.1Er alloy and belongs to the technical field of nonferrous metals. The two-stage aging process comprises the following specific process steps of firstly, performing solution treatment on the alloy, improving the temperature from room temperature to 475DEG C at the speed of 2DEG C / min, insulating for 2h and performing water cooling and quenching at the room temperature; secondly, performing low-speed temperature-rise two-stage aging heat treatment: for the first-stage aging, improving the temperature from the room temperature to 120DEG C at the speed of 1DEG C / min and insulating for 5h; for the second-stage aging, improving the temperature from 120DEG C to the second-stage aging temperature at the speed of 1DEG C / min; and for a second-stage aging system, insulating at 150DEG C for 12-36h, insulating at 160DEG C for 8-36h or insulating at 170DEG C for 6-34h. According to the two-stage aging process disclosed by the invention, the yield strength of about 450-545MPa can be obtained, a Vickers hardness value is about 160-193HV; and comprehensive performance of an alloy of which the exfoliation corrosion resistance is EV grade or above is improved.

Description

technical field [0001] The invention belongs to the technical field of non-ferrous metals, and relates to a double-stage aging heat treatment process for an Al-5.6Zn-2.1Mg-1.2Cu-0.1Zr-0.1Er aluminum alloy. Background technique [0002] Al-Zn-Mg-Cu series aluminum alloy belongs to heat treatment strengthenable aluminum alloy. It has the characteristics of low density, high specific strength and good toughness. It is widely used as the main structural material in aerospace and transportation fields. However, its shortcomings such as low toughness and poor corrosion resistance limit its application range. The current effective method is to adjust the alloy composition and optimize the heat treatment system to obtain an alloy distribution with intermittent grain boundary structure and dispersed intragranular structure, so as to improve the alloy's corrosion resistance. Corrosion performance while maintaining the original high strength, improving the overall performance of the al...

Claims

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Application Information

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IPC IPC(8): C22F1/053C22C21/10
CPCC22F1/053C22C21/10C22F1/002
Inventor 黄晖张明珠聂祚仁刘冉高坤元文胜平吴晓蓝吴浩
Owner BEIJING UNIV OF TECH
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