Method for preparing amorphous alloy

Abstract

The invention belongs to the technical field of amorphous alloy preparation, and relates to a method for preparing an amorphous alloy. The metal powder is sent out through airflow with supersonic speed, laser is utilized to suspend and melt the powder at the position away from a substrate by a certain distance, and the powder is deposited in a supercooled liquid form after being blown and cooled by the airflow to form amorphous alloy; according to the method, the amorphous alloy block material without size limitation is obtained by controlling the powder feeding, melting and deposition positions in a mode of combining laser suspension melting of alloy powder and supersonic airflow high-speed deposition, meanwhile, the movement track of the substrate can be programmed in the preparation process according to the shape requirement of a workpiece, and the production efficiency is improved. Three-dimensional forming of amorphous alloy workpieces in different shapes is achieved; according to the method, the amorphous alloy size limitation can be solved, the amorphous alloy workpiece without size constraint can be prepared, and the method is particularly suitable for preparing the amorphous alloy workpiece of a large-area thin-wall structure.

Description

technical field [0001] The invention belongs to the technical field of amorphous alloy preparation, and relates to a method for preparing an amorphous alloy, in particular to a novel method for preparing an amorphous alloy by laser suspension melting supersonic powder gas flow deposition. Background technique [0002] Since the preparation of amorphous alloys requires a rapid solidification process, this has long limited the choice of preparation processes for amorphous alloys and the size of amorphous alloy parts. For many years, amorphous alloy strips with micron-scale thickness were usually prepared by single-roll suspension quenching, while most bulk amorphous alloys were obtained by copper mold casting. Researchers have developed alloy components with large amorphous formation ability to reduce the critical cooling rate of amorphous alloy formation, but there is no breakthrough in the size or process limitations of amorphous alloys (except for individual alloy systems s...

AI Technical Summary

Problems solved by technology

Researchers have developed alloy components with large amorphous formation ability to reduce the critical cooling rate of amorphous alloy formation, but there is no breakthrough in the size or process limitations of amorphous alloys (except for individual alloy systems such as Pd-Cu-Ni- P can be made into 76mm cylindrical amorphous rods, and the general level of other different alloy systems can only be made into cylindrical amorphous rods with a critical diameter of 1-10mm)

In addition, due to the particularity of its own structure, amorphous alloys have low plasticity and poor machinability, so some parts with complex shape requirements cannot be completely obtained by casting methods.

[0003] Through research, it is found that alloys with high amorphous forming ability can be prepared by laser surface cladding, master alloy surface remelting or laser additive manufacturing, but the heat flow during laser treatment will lead to the formation of amorphous alloys at the heat conduction position. Crystallization occurs

In addition, although it has been reported that the spray deposition method is used to prepare large-sized amorphous alloy materials, the heat flow is still conducted through the substrate, and the method of completely conducting through the substrate is not easy to achieve complete amorphization of the alloy, which will cause partial crystallization and cannot be obtained. A complete bulk amorphous alloy with a certain size and thickness (the general level can only achieve a thickness of tens to hundreds of microns)

[0004] In summary, amorphous alloys have many performance advantages that traditional crystal alloys do not have. However, due to the limitations of amorphous formation ability and preparation process, it is still extremely difficult to prepare large-sized completely amorphous alloys. Effective measures should be taken Breaking through the size and process limitations of amorphous alloys and establishing a new preparation method for amorphous alloys is of great significance for promoting the practical application of amorphous alloys