Semi-solid Mg2Si particle reinforced Mg-Al-Mn composite material rheological model building method based on ultrasonic preparation

Abstract

The invention provides a semi-solid Mg2Si particle reinforced Mg-Al-Mn composite material rheological model building method based on ultrasonic preparation. The method includes the steps that (1) an ultrasonic vibration method is used for preparing semi-solid slurry of a Mg2Si particle reinforced Mg-Al-Mn composite material; (2) relations between the apparent viscosity of the Mg2Si particle reinforced Mg-Al-Mn composite material and Mg2Si reinforced phase volume fraction and between the apparent viscosity of the Mg2Si particle reinforced Mg-Al-Mn composite material and Mg2Si reinforced phase solid fraction are obtained on ultrasonic conditions, and the relations are represented through the formula that eta mmc / eta m=(1+af Mg2Si+bf2 Mg2Si); (3) on the basis of apparent viscosity measurement of a basic material, the formula eta m=Aexp(Bfs) is met, wherein B is a constant term, fs is the solid fraction, A is a power function related to ultrasonic power, a parameter A is adopted to represent the formula of A=cP-d, c and d are constant terms, and P is the ultrasonic power; (4) a rheological model is obtained according to the step (2) and step (3), and the model is that eta mmc=cexp(Bfs)P-d(1+afMg2Si+bf2 Mg2Si). By means of the method, rheological features of the semi-solid Mg2Si particle reinforced Mg-Al-Mn composite material prepared in an ultrasonic mode can be obtained, and the method plays an important role in optimizing rheological forming process parameters.

Description

technical field [0001] The invention belongs to the field of metal matrix composite material forming. technical background [0002] Rheological forming is to use methods such as vigorous stirring to prepare semi-solid metal slurry with a predetermined solid phase fraction, keep the semi-solid slurry warm, and send the semi-solid metal slurry directly to the forming equipment for casting or forging. process method. In recent years, both academia and business circles have generally paid attention to the rheoforming technology. This process has the characteristics of low energy consumption, short process flow, and simple equipment. It can be easily accepted by small and medium-sized production enterprises and is considered to have good industrial applications. prospect. [0003] The rheological properties of semi-solid slurry are one of the important factors affecting its flow forming, and the rheological properties directly determine the quality of rheologically formed parts...

AI Technical Summary

Problems solved by technology

At present, the research on the apparent viscosity of semi-solid slurry mainly focuses on the semi-solid slurry prepared by mechanical stirring method, electromagnetic stirring method or isothermal heat treatment method. The preparation of semi-solid slurry by ultrasonic vibration method is a new development recently. Ultrasound technology, using ultrasound to cause convection of the melt, so as to achieve the shearing effect on the slurry, and obtain a fine non-dendritic semi-solid structure; in addition, ultrasonic vibration can make the reinforcement phase in the composite material more uniformly dispersed, and can improve the reinforcement The wettability of the phase and the matrix can further improve the comprehensive performance of the composite material; but there is no research on the apparent viscosity of the semi-solid composite material slurry prepared by the ultrasonic method, so the study of the semi-solid composite material slurry prepared by the ultrasonic method Excellent rheological properties for high quality molded parts

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