Method for preparing metal matrix composite under compounding effect of low-pressure pulsed magnet field and ultrasound

A composite action, low-voltage pulse technology, applied in the field of solidification control of metal matrix composites, can solve the problems of limited application and promotion, unclear distribution rules, etc., and achieve the effect of low voltage, simple equipment, and small equipment volume.

Active Publication Date: 2016-10-05
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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Problems solved by technology

However, the influence of low-voltage pulsed magnetic field and ultrasonic composite action on the structure of the metal matrix composite billet remains to be studied, especially for the distribution of whiskers and carbon nanotubes ...

Method used

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  • Method for preparing metal matrix composite under compounding effect of low-pressure pulsed magnet field and ultrasound
  • Method for preparing metal matrix composite under compounding effect of low-pressure pulsed magnet field and ultrasound

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Embodiment 1

[0032] In this embodiment, the AZ91D magnesium alloy is heated to 700°C in a low-carbon steel crucible, and then cooled to 590°C after heat preservation, and dried magnesium borate whiskers are added and mechanically stirred for 5 minutes. After the mechanical stirring, increase the heating power, increase the melt temperature to 650°C and keep it warm for 20 minutes, then pour into the preheating temperature of 600°C Graphite mould, pulsed magnetic field and ultrasound are applied throughout the solidification process of the ingot. The magnetic field excitation voltage is 100V, the frequency is 2Hz, the ultrasonic power is 1000W, and the frequency is 2.0kHz. like figure 2 As shown, the magnesium borate whisker-enhanced solidified structure of AZ91D magnesium alloy ingot obtained without applying magnetic field and ultrasound (a) and applying ultrasound alone (b) and applying pulsed magnetic field and ultrasound (c) can be seen that by applying pulsed magnetic field Combin...

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Abstract

The invention relates to the field of solidification control of metal matrix composites and specifically relates to a method for preparing a metal matrix composite under a compounding effect of low-pressure pulsed magnet field and ultrasound. The method comprises the following steps: re-melting magnesium alloy or aluminum alloy serving as a matrix in a resistance furnace; reducing the heating power, reducing the melt temperature to semisolid temperature, adding a reinforcing phase whisker or carbon nano tube after keeping the temperature for a period of time and mechanically stirring; increasing the temperature to the temperature above liquidus and keeping the temperature for a period of time; injecting the melt into a preheated graphite jig and putting into the place under the compounding effect of low-pressure pulsed magnet field and ultrasound and processing till the alloy is completely solidified. According to the invention, the compounding effect of low-pressure pulsed magnet field and ultrasound is adopted for processing and realizing the preparation for the metal matrix composite, so that the uniformly distributed whisker or carbon nano tube is acquired; the dispersing problem of the reinforcing phase in the metal melt in the process of preparing the metal composite with larger long diameter ratio of the reinforcing phase at present is solved; the method is fit for preparing the metal matrix composites at various long diameter ratios of the reinforcing phase.

Description

technical field [0001] The invention relates to the field of solidification control of metal-matrix composite materials, in particular to a method for preparing metal-matrix composite materials through the composite action of a low-voltage pulsed magnetic field and ultrasonic waves. Background technique [0002] Metal matrix composites are one of the important structural materials in modern industry. Due to the ultra-high strength of whiskers and carbon nanotubes, the use of whiskers or carbon nanotubes as a reinforcing phase has become an important research direction of metal matrix composites in recent years. . However, because whiskers and carbon nanotubes have very large aspect ratios and poor wettability with metal melts, agglomeration easily occurs during the preparation of composite materials, so how to uniformly disperse them in the melt becomes One of the key technical problems of metal matrix composites. [0003] Ultrasonic melt treatment has been studied in the ...

Claims

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Application Information

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IPC IPC(8): B22D27/02B22D27/20
Inventor 杨院生赵福泽冯小辉李应举罗天骄
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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