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Method for preparing short-flowpath fine crystal super-plastic material

A superplastic and short-process technology, applied in the field of metal materials, can solve problems such as composition segregation and uneven structure, poor processing performance of alloys, difficulty in completely homogenizing composition and structure, etc., to improve superplastic performance, reduce manufacturing costs, The effect of broad industrial application prospects

Active Publication Date: 2008-12-31
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it needs to be pointed out that due to the obvious composition segregation and microstructure inhomogeneity in alloy castings, not only the processing performance of the alloy is poor, but also it is difficult to achieve complete homogenization of composition and microstructure in one-step friction stir processing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Using an 8 mm thick 7075 aluminum alloy as-cast plate, after homogenization annealing at 460 ° C for 24 hours, then friction stir processing, under the processing parameters of tool speed 1200 rpm and travel speed 100 mm / min, the obtained grain Uniform fine-grained structure with a grain size of 3 microns. The superplastic tensile test shows that good superplastic properties are obtained in the temperature range of 350-470°C, and there is no abnormal grain growth at 470°C, and 700% superplasticity can still be obtained. The maximum superplasticity is 1050% at 450°C and 1×10 -2 the s -1 obtained at high strain rates.

Embodiment 2

[0014] Using a 6 mm thick 2024 aluminum alloy as-cast plate, perform homogenization annealing at 490°C for 12 hours and then perform friction stir processing. The grain size is obtained under the parameters of tool speed 500 rpm and travel speed 100 mm / min Uniform fine-grained structure of 4.5 microns. The maximum superplasticity achieved is 450% at 430°C and 3×10 -3 the s -1 obtained at a strain rate of .

Embodiment 3

[0018] Use a 6 mm thick Mg-Zn-Y-Zr as-cast plate, perform homogenization annealing at 420°C for 10 hours, and then perform friction stir processing, under the parameters of tool speed 600 rpm and travel speed 100 mm / min A uniform fine-grained structure with a grain size of 5 microns was obtained. The maximum superplasticity achieved is 550% at 450°C and 3×10 -3 the s -1 obtained at a strain rate of .

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Abstract

Disclosed is a process for preparing short process fine crystalline superplasticity materials, which is characterized in that: cast alloy is used as a starting material for carrying out the agitation and friction processing after the homogenization heat treatment, and a bulky, loose and uneven cast structure is changed into an even and compact fine crystalline superplasticity structure.

Description

Technical field: [0001] The invention relates to metal materials, and in particular provides a preparation method of a short-flow fine-grained superplastic material, which is suitable for processing aluminum alloys, magnesium alloys, zinc alloys, and copper alloys. Background technique: [0002] Superplasticity has gradually developed into a mature overall industrial component forming process, which is widely used in automotive, aviation and other industrial fields. Traditionally, the preparation of fine-grain superplastic aluminum alloys adopts thermomechanical processing methods, involving overaging treatment, multi-pass warm rolling, recrystallization treatment and other processes, which are complicated and costly. [0003] Friction stir processing is a new plastic processing technology for metal materials developed on the basis of the basic principles of friction stir welding. Compared with other plastic processing techniques, the friction stir processing process is sim...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/00C21D1/26C21D1/34
Inventor 马宗义刘峰超
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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