A kind of cnts reinforced magnesium-based composite material and preparation method thereof

Abstract

The invention discloses a CNTs-reinforced magnesium-based composite material and a preparation method thereof. The CNTs are pre-dispersed by a chemical pretreatment method, and the CNTs-reinforced magnesium-based composite material is prepared by a stirring casting method. The results show that the chemical pretreatment composite stirring The casting method has a positive effect on the uniform dispersion of CNTs; the present invention aims at the poor wettability of CNTs on the metal interface, and the phenomenon that agglomeration easily occurs in the metal melt, and the magnesium alloy is used as the matrix and the CNTs are used as reinforcements. The CNTs / Mg-6Zn composite material is made after semi-solid stirring smelting, ultrasonic-assisted stirring, casting, solid solution and aging treatment under the action of the atmosphere. This preparation method has advanced technology and strict procedures. The prepared CNTs / Mg6ZnCNTs / Mg ‑6Zn composite material, after adding CNTs, the structure of CNTs / Mg‑6Zn composite material is more refined, and the grain size is obviously finer, which realizes fine grain strengthening; near the grain boundary of CNTs / Mg‑6Zn composite material, it can be found that With multiple second phases, CNTs hinder the movement of dislocations, resulting in the accumulation of dislocations, which plays a role in strengthening the second phase.

Description

technical field [0001] The invention belongs to the field of preparation of magnesium-based composite materials, and in particular relates to a CNTs-reinforced magnesium-based composite material and a preparation method thereof. Background technique [0002] In recent years, magnesium matrix composites (MMCs) have attracted the attention of a large number of researchers due to their ultra-lightweight, high specific strength and high specific stiffness. At the same time, magnesium-based composite materials have extremely broad application prospects in the fields of aerospace and automobile manufacturing. The performance of magnesium-based composites can be enhanced by adding specific reinforcing materials. Carbon nanotubes (CNTs), as novel one-dimensional nanomaterials, have attracted considerable attention due to their unique mechanical, electrical, and thermal properties as well as low density and already extensive research interest. In recent years, researchers have begu...

AI Technical Summary

Problems solved by technology

When the CNTs reinforced magnesium matrix composites prepared by the traditional direct addition method obtain high tensile strength and yield strength, the elongation will decrease, which limits the application and development of magnesium matrix composites as structural materials in the engineering field.

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