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Preparation method of 7XXX series aluminum alloy bar based on mechanical ultrasonic vibration aging

An ultrasonic vibration, aluminum alloy technology, applied in the field of aluminum alloy processing

Active Publication Date: 2021-05-18
江苏江南创佳型材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above heat treatment process has a certain effect on improving the performance of 7XXX series alloys, there is still a lot of room for improvement in shortening the production cycle of this type of alloy and improving its corresponding fatigue resistance

Method used

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  • Preparation method of 7XXX series aluminum alloy bar based on mechanical ultrasonic vibration aging
  • Preparation method of 7XXX series aluminum alloy bar based on mechanical ultrasonic vibration aging

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The 7050 aluminum alloy ingot was homogenized at 470°C for 20 hours, then air-cooled; the air-cooled ingot was hot-extruded at 480°C, the extrusion ratio was 35, the extrusion speed was 1m / min, and water-cooled after extrusion , the diameter of the rod 1 obtained is 3cm; the hot extruded rod 1 is rotated through the mechanical ultrasonic vibration device 2 at a fixed position, the diameter of the cylindrical ultrasonic indenter 3 is 0.5cm, and the work of the ultrasonic indenter 3 The frequency is 20kHz, the maximum contact stress is 80N, the rotation speed of bar 1 is 3.18 rpm, and the forward speed of bar 1 is 6.37cm / min. After processing, a 7XXX series aluminum alloy bar based on mechanical ultrasonic vibration aging is obtained.

Embodiment 2

[0034] The 7050 aluminum alloy ingot was homogenized at 460°C for 6 hours, then air-cooled; the air-cooled ingot was hot-extruded at 470°C, the extrusion ratio was 15, the extrusion speed was 0.6m / min, and water-cooled after extrusion Processing, the diameter that obtains rod 1 is 20cm; The rod 1 after hot extrusion is rotated through the mechanical ultrasonic vibrating device 2 that is positioned at fixed position, and the diameter of cylindrical ultrasonic indenter 3 is 3cm, and the work of ultrasonic indenter 3 The frequency is 20kHz, the maximum contact stress is 100N, the rotation rate of bar 1 is 2.86 rpm, and the forward speed of bar 1 is 34.38cm / min. After processing, a 7XXX series aluminum alloy bar based on mechanical ultrasonic vibration aging is obtained.

Embodiment 3

[0036]The 7050 aluminum alloy ingot was homogenized at 480°C for 24 hours, then air-cooled; the air-cooled ingot was hot-extruded at 460°C, the extrusion ratio was 25, the extrusion speed was 1.2m / min, and water-cooled after extrusion Processing, the diameter that obtains rod 1 is 5cm; The rod 1 after hot extrusion is rotated through the mechanical ultrasonic vibrating device 2 that is positioned at fixed position, and the diameter of cylindrical ultrasonic indenter 3 is 0.5cm, and the diameter of ultrasonic indenter 3 The working frequency is 20kHz, the maximum contact stress is 60N, the rotation speed of bar 1 is 1.91 rpm, and the forward speed of bar 1 is 3.82cm / min. After the processing is completed, a 7XXX series aluminum alloy bar based on mechanical ultrasonic vibration aging is obtained. .

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Abstract

The invention discloses a preparation method of a 7XXX series aluminum alloy bar based on mechanical ultrasonic vibration aging. The preparation method comprises the following steps that A, a 7XXX series aluminum alloy cast ingot is subjected to homogenization treatment; B, hot extrusion is conducted on the homogenized cast ingot to form the bar; and C, the bar obtained after hot extrusion is rotated to pass through a mechanical ultrasonic vibration device located at the fixed position, and the 7XXX series aluminum alloy bar based on mechanical ultrasonic vibration aging is obtained. According to the preparation method, the mechanical ultrasonic vibration aging device with four symmetrically distributed pressure heads is used for machining the hot extrusion bar, so that uniform precipitation of a nanoscale precipitated phase in an alloy, nanocrystallization of surface layer grains and gradient distribution of grain sizes are promoted, meanwhile, good surface quality and uniformity are achieved, the toughness and fatigue resistance of the 7XXX series aluminum alloy are remarkably improved, and combination of ultrahigh strength and good plasticity is achieved.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy processing, in particular to a method for preparing 7XXX series aluminum alloy rods based on mechanical ultrasonic vibration aging. Background technique [0002] Because 7XXX series aluminum alloy has a series of advantages such as high strength, low density, good processing performance and resistance to stress corrosion cracking, it is often processed into various types of materials and widely used in rail transportation, aerospace, national defense and military fields. The 7XXX series aluminum alloys (mainly Al-Zn-Mg and Al-Zn-Mg-Cu two main alloy series) are typical precipitation-strengthened aluminum alloys, which are precipitated at the nanometer or submicron level in the alloy by controlling the effective aging process. Metastable precipitates such as Mg-Zn or Al-Mg-Zn can significantly increase the strength of the alloy and obtain ultra-high-strength aluminum alloys. [0003] The co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/053C21D9/00C22F3/00B21C31/00
CPCC22F1/053C21D9/0075C22F3/00B21C31/00
Inventor 梅泽锋周宝华董春泉黄晓中
Owner 江苏江南创佳型材有限公司
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