Mechanical alloying is a complex process, so to obtain the ideal phase and microstructure, a series of influencing parameters need to be optimized and designed. Listed below are some parameters that have a significant impact on the mechanical alloying results. Grinding types There are various grinding devices for producing mechanical alloyed powder, such as: planetary mill, vibration mill, stirring mill, etc. Their grinding energy, grinding efficiency, material contamination degree, and the force between the grinding media and the inner wall of the grinding container are different, so they have a crucial impact on the grinding results. The material and shape of the grinding container have an important impact on the grinding results. During the process, the impact and friction of the grinding medium on the inner wall of the grinding container will cause part of the material on the inner wall of the grinding container to fall off and enter the grinding material, causing pollution. Commonly used grinding vessel materials are usually quenched steel, tool steel, stainless steel, P>K>5 or P>; lined with quenched steel, etc. Sometimes special materials are selected for special purposes. For example, when the grinding material contains copper or titanium, a copper or titanium grinding container is used to reduce pollution.

In addition, the shape of the grinding container is also very important, especially the shape design of the inner wall. For example, a special-shaped cavity is to install fixed sliding plates and bumps in the grinding cavity, so that the cross section of the grinding cavity changes from a circular shape to a round one. The special shape increases the sliding speed of the medium and generates centripetal acceleration, which enhances the friction between the media and is beneficial to the alloying process. Whether the final product of MA is a solid solution, intermetallic compound, nanocrystal, or amorphous phase, it all involves diffusion issues, and diffusion is affected by grinding temperature, so temperature is also an important factor affecting MA, such as Ni-50%Zr When the powder system was vibrated and ball milled, no amorphous phase was found to form when it was ground under liquid nitrogen cooling for 15 hours; when grinding at 200oC, it was found that the powder material was completely amorphous; when grinding at room temperature, partial amorphization was achieved.

The above factors are not independent of each other. For example, the optimal grinding time depends on the grinding type, media size, grinding temperature, ball-to-material ratio, etc.

Mechanical alloying has the following advantages when synthesizing high-melting-point alloys or intermetallic compounds: avoiding the high-temperature melting and solidification processes of ordinary metallurgical methods, alloying is achieved at room temperature, and a uniform alloy with a fine structure is obtained. , and the yield is high, so it has become a good method for producing alloys and new materials that are difficult to prepare by conventional means.