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A method for improving the microstructure and mechanical properties of titanium-aluminum layered composites

A layered composite material and mechanical technology, applied in the field of composite material preparation, can solve the problems of limitation, Ti room temperature plasticity, low toughness, etc., and achieve the effects of performance optimization, good compatibility, and high elastic modulus

Active Publication Date: 2019-05-21
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But since Al 3 The room temperature plasticity and toughness of Ti are too low, which limits the practical application of this kind of titanium-aluminum layered composites.

Method used

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  • A method for improving the microstructure and mechanical properties of titanium-aluminum layered composites
  • A method for improving the microstructure and mechanical properties of titanium-aluminum layered composites
  • A method for improving the microstructure and mechanical properties of titanium-aluminum layered composites

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Cut the 0.5mm Al foil and 0.9mm Ti foil into a 100mm×100mm square foil, and cut the tungsten core SiC fiber (diameter ~ 100μm) and NiTi alloy wire (diameter 300μm) into a length of 100mm. First, the tungsten core SiC ceramic fiber is pretreated, the surface of the fiber is cleaned with alcohol to remove surface organic matter and impurities, and finally the fiber is dried. Use metallographic sandpaper to polish the surface of Ti foil, Al foil and NiTi alloy wire to remove the oxide layer, and then place it in ultrasonic cleaning (15-20min) at a temperature of 30°C to 40°C to remove the remaining oxide particles and impurities, and finally wash the metal foil and NiTi alloy wire with alcohol and then dry them. According to "Ti foil-SiC fiber / NiTi alloy wire-Al foil-Ti foil" as a unit, 4 SiC fibers are placed between every 2 NiTi alloy wires, with a distance of 1 mm, and 3 units are stacked, and the upper and lower outermost layers are uniform. For Ti foil.

[0038] Pla...

Embodiment 2

[0042] The pretreatment of raw material is with embodiment 1, and the technological parameter that adopts is: at 10 -3 Under Pa, raise the temperature to 600°C at a rate of 10°C / min and hold it for one hour. During the heat preservation process, the pressure is lower than 0.5MPa, then the temperature is slowly raised to 650°C and held for 4 hours, the pressure is 2MPa, and finally cooled to room temperature with the furnace.

[0043] The sample layered structure SEM photomicrograph of present embodiment gained (see attached Figure 5 ), the magnification is 30 times, it can be seen that the NiTi alloy wire reacts fully with Al, and the long-term heat preservation makes it fully diffused. The intermetallic compound matrix is ​​composed of light gray phase and dark gray phase, and the center line of the intermetallic compound layer is not observed , SiC fibers are uniformly distributed in the middle of the intermetallic compound matrix, and the micrograph of the fiber / matrix in...

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Abstract

The invention provides a method for improving a titanium-aluminum laminated composite material structure and improving mechanical performance. Tungsten core SiC ceramic fibers are pre-treated, and NiTi alloy wires, Ti foil and Al foil are subjected to ultrasonic cleaning; the Ti foil, the tungsten core SiC ceramic fibers, the NiTi alloy wires and the Al foil serve as a unit to be stacked according to the sequence of the Ti foil, the tungsten core SiC ceramic fibers, the NiTi alloy wires, the Al foil and the Ti foil, the four SiC fibers are placed between every two NiTi alloy wires, the interval is 1 mm, and the upper surface and the lower surface are both the Ti layers; and sintering is conducted on the unit through a vacuum hot pressing device. According to the method for improving the titanium-aluminum laminated composite material structure and improving the mechanical performance, through the design principle that nickel and titanium elements in the NiTi wires easily react with aluminum elements under the low temperature to form inter-metallic compounds, the SiC fibers and the NiTi alloy wires are simultaneously introduced into inter-metallic compound layers through the vacuum hot pressing sintering method, the SiC fibers serve as reinforcing bodies, introduction of the NiTi alloy wires aims to remove inter-metallic compound layer center lines through the sufficient diffusion reaction mechanism of the NiTi alloy wires and Al, and the SiC fiber / base body interface is improved, so that the mechanical performance of a composite material is improved.

Description

technical field [0001] The invention relates to a preparation method of a composite material, in particular to a modification method of a titanium-aluminum layered composite material. Background technique [0002] In recent years, a new type of light-weight and high-performance aerospace structural material - intermetallic compound layered composites has attracted widespread attention. People have successfully prepared intermetallic compound layered composite systems such as Ti-Al, Ni-Al, Nb-Al and Ti-Cu by using different preparation techniques. Among them, the Ti-Al intermetallic compound layered composite material is due to Its excellent physical and mechanical properties make it have great development prospects in cutting-edge industries such as aviation and aerospace. Among them, the most representative one is the intermetallic compound Al 3 Ti as the matrix, Ti / Al reinforced by high-strength titanium alloy (Ti-6Al-4V) 3 Ti layered composite material (metal-intermeta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C47/02C22C47/20C22C49/11C22C49/06C22C49/14C22C101/14C22C111/00
CPCC22C47/02C22C47/20C22C49/06C22C49/11C22C49/14
Inventor 姜风春韩雨蔷蔺春发果春焕常云鹏牛中毅王振强
Owner HARBIN ENG UNIV
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