Processing method for obtaining high-proportion special grain boundary from tin bronze

Abstract

The invention discloses a processing method for obtaining a high-proportion special grain boundary from tin bronze. The processing method for obtaining the high-proportion special grain boundary from tin bronze comprises the steps that firstly, a plurality of workpieces with the dimension being 20 mm, a plurality of workpieces with the dimension being 9 mm and a plurality of workpieces with the dimension being 3 mm are obtained by cutting the tin bronze in the rolling direction, the transverse direction and the normal direction correspondingly through a linear cutting tool, then the workpieces are placed in the environment at the temperature of 400-800 DEG C for heat preservation for 0.5-5 hours, and then the workpieces are subjected to water quenching to the room temperature; secondly, polishing is conducted stage by stage with 200-2500# metallographic abrasive paper, and then mechanical polishing is conducted; and thirdly, electrochemical polishing is conducted in a polishing solution, the polishing temperature is 20-30 DEG C, the polishing voltage is 9 V, and the polishing time is 90 s. According to the processing method, it is proved through test analysis that the proportion of the special grain boundary is remarkably increased before the recrystallization annealing temperature is reached completely along with the rise of the annealing temperature; the structure obtained through the heat treatment process is stable, the change rule is obvious, and the experiment repeatability is good; and operation of the heat treatment process is simple, the technique is reliable, and the efficiency is high.

Description

technical field [0001] The invention relates to a processing method for obtaining a high proportion of special grain boundaries in tin bronze. The method is to obtain a high proportion of special grain boundaries in tin bronze alloy materials through a heat treatment process, and belongs to the field of grain boundary engineering. Background technique: [0002] For polycrystalline materials, the grain boundary is the most important microstructure, which is closely related to the physical and chemical properties of engineering materials. In 1984, Watanabe proposed the concept of "grain boundary control and design", which improved the overall performance of materials related to grain boundaries by increasing the proportion of low Σ-CSL grain boundaries in materials and controlling the distribution of grain boundary characteristics in materials, and then developed The concept of "Grain Boundary Engineering" (Grain Boundary Engineering, GBE). Special Boundaries (SBs) usually re...

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Problems solved by technology

Since the commonly used equipment for measuring crystal orientation so far, such as EBSD, can only measure the misorientation, but cannot determine the crystal geometric relationship where the crystal interface is located

On the other hand, most of the grain boundaries in the material are curved except for the coherent twin boundaries. Even if the crystallographic parameters of the grain interfaces can be determined, they will continue to change due to the bending of the grain interfaces. This gives the ability to completely define the grain boundaries. Geometric parameters, i.e. defining all degrees of freedom makes it difficult

Although the current research results show that the single-section trace analysis method and the five-parameter crystal interface determination method can be used to more effectively define the crystal geometric relationship of the crystal interface, they are based on the method of probability and statistics to define the crystal interface index, which should be widely used. immature

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