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

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 ...

AI Technical Summary

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 with large length-diameter ratios in metal matrix composites. The law is still unclear, which limits the application and promotion of pulsed magnetic field and ultrasonic composite action in the preparation of metal matrix composite ingots

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