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Preparation method of aluminum based composite material having ultrahigh strength and controllable plasticity

An aluminum-based composite material and ultra-high-strength technology, which is applied in the field of preparation of aluminum-based composite materials, can solve the problems that high strength and large plasticity cannot coexist, and achieve the effect of low alloy cost

Active Publication Date: 2013-03-20
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

[0004] The purpose of the present invention is to provide a method for preparing an aluminum-matrix composite material with ultra-high strength and controllable plasticity. It has a fracture strength of more than 1500MPa, and its plasticity can reach 21%, which has exceeded the current level of high-strength steel, and has good high temperature stability

Method used

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  • Preparation method of aluminum based composite material having ultrahigh strength and controllable plasticity
  • Preparation method of aluminum based composite material having ultrahigh strength and controllable plasticity
  • Preparation method of aluminum based composite material having ultrahigh strength and controllable plasticity

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Firstly, the master alloy is prepared by electric arc furnace melting, and the composition is Al86; Ni6; Co2; Y4.5; La1.5 (at.%). Then the master alloy was remelted in a vacuum induction furnace, and an aluminum-based amorphous alloy sample with a diameter of 1 mm was prepared by copper mold casting. A 2 mm long sample was taken, both ends were ground flat, and put into a DSC device for isothermal annealing.

[0028] The specific process parameters are: the vacuum degree is not lower than 1.0×10 -5 mbar, the argon protection pressure is 100mbar, the casting temperature is 1100°C, the holding time is 70s, the injection pressure difference is 800mbar, the annealing temperature is 380°C, the annealing time is 60min, and the argon atmosphere. The X-ray diffraction pattern of the alloy is shown in figure 1 . image 3 Middle C is the SEM photo of the aluminum matrix composite.

[0029] The room temperature compression performance test of the samples prepared in this experi...

Embodiment 2

[0031] The difference with Example 1 is:

[0032] The DSC annealing time used is different, which is 120min. The compression curve under this process is as follows figure 2 As shown, its organization is image 3 As shown in (d), Figure 5 (d) shows that the fracture mode of the alloy is splitting.

[0033] Result: Reduced compressive strength, no work hardening.

Embodiment 3

[0035] The difference with Example 1 is:

[0036] The annealing time of the present embodiment is 30min, and the compression curve under this technology is as follows figure 2 As shown, the sample organization is image 3 As shown in (b), Figure 5 (b) shows that the fracture mode of the alloy is chipping.

[0037] Results: The crystal grains are smaller, the fracture strength is slightly higher than that of Example 1, and the plasticity is about 5%.

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Abstract

The invention aims to provide a preparation method of an aluminum based composite material having an ultrahigh strength and a controllable plasticity. The concrete components of the composite material comprise 5.5-7% of Ni, 1-2% of Co, 4-5% of Y, 1-2% of La, and the balance Al. The preparation method is characterized in that the composite material is prepared through adopting an isothermal annealing process, and the concrete technological parameters comprise an annealing temperature of 380DEG C, an annealing time of 0-120min and an argon atmosphere. The method breakthroughs a problem that the high strength and the large plasticity of the aluminum based composite material cannot coexist, and enables the prepared aluminum based composite material to have a breaking strength of above 1500MPa, a plasticity reaching 21% and exceeding the level of present high-strength steel materials, and a good high-temperature stability. The method is a new approach for the development of high-cost-performance and high-strength lightweight materials, and makes the application of the ultrahigh-strength aluminum based composite material as a structural material possible.

Description

technical field [0001] The invention relates to a method for preparing composite materials, and in particular provides a method for preparing aluminum-based composite materials with ultra-high strength and controllable plasticity. Background technique [0002] Since non-renewable resources will bring disasters to human society, people put forward requirements for materials in some special fields such as aviation and aerospace, which are cost-effective, high-strength and lightweight. It is based on titanium alloys and organic composite materials, and the high quality of materials leads to high fuel consumption. Therefore, in recent years, major industrialized countries are undergoing industrial transformation centered on high-strength and light-weight materials. [0003] Compared with traditional aluminum alloys, aluminum matrix composites have ultra-high strength, good plasticity and excellent corrosion resistance. At present, their main application is limited by their machi...

Claims

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Application Information

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IPC IPC(8): C22C21/00C22F1/04B22D18/06
Inventor 阚东王建强杨柏俊孙文海常新春侯万良
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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