Alloy material with high strength as well as ductility and semi-solid state sintering preparation method and application of alloy material

Abstract

The invention belongs to the technical field of alloy material preparation, and discloses an alloy material with high strength and ductility as well as a semi-solid state sintering preparation method and an application of the alloy material. The preparation method comprises three steps: mixing powder, preparing alloy powder by high-energy ball milling, and carrying out semi-solid sintering on the alloy powder; the key is two-step sintering which comprises the following steps: heating below the melting temperature of the lowest-temperature melting peak of the alloy powder under the condition of sintering pressure, and carrying out sintering densification treatment; and releasing pressure, heating to sintering temperature Ts, carrying out heat preservation and carrying out semi-solid processing, wherein the sintering temperature is Ts; Ts is greater than or equal to the melting temperature of the lowest-temperature melting peak of the alloy powder; and Ts is smaller than or equal to the melting temperature of the highest-temperature melting peak of the alloy powder. According to the method disclosed by the invention, Ti-based and Ni-based high-melting point alloy systems can be subjected to semi-solid processing, so that the alloy materials with novel microstructures such as nanocrystal, superfine crystal, fine crystal or dual-scale structures, and excellent performance are obtained; and the alloy material is widely applied to the fields such as aerospace aviation, war industry and instruments.

Description

technical field [0001] The invention belongs to the technical field of alloy material preparation, and particularly relates to a high-strength and tough alloy material and a semi-solid sintering preparation method and application thereof. Background technique [0002] Semi-solid metal processing refers to the processing method of metal forming by utilizing the semi-solid temperature range during the transition of metal from solid state to liquid state or from liquid state to solid state. In the early 1970s, the Massachusetts Institute of Technology proposed the concept of semi-solid processing technology. The unique advantages of easy automation and the formation of new processing technology have attracted the attention of researchers from all over the world, and the products and applications of semi-solid processing have also developed rapidly. [0003] However, up to now, the research on semi-solid processing technology has mainly focused on low melting point alloy system...

AI Technical Summary

Problems solved by technology

However, this method also has two defects: one is that the five-component component is easy to form an intermetallic compound, which offsets the strengthening effect of dendrites and deteriorates the ductility of the material, thereby forming a nanocrystalline matrix / amorphous matrix + ductile β- The composition range of Ti dendrites is relatively narrow; the second is that the cooling rate is limited during the copper mold casting process, which leads to the preparation of these high-strength and tough dual-scale titanium alloys with a size of several millimeters (less than 4 millimeters).

However, due to the inherent defect of the external reinforcement phase of the composite material - poor wettability with the matrix alloy, and this semi-solid powder metallurgy method is difficult to ensure that the second phase is evenly distributed in the matrix, semi-solid processing combined with powder metallurgy technology to prepare There is room for substantial improvement in the performance of composite materials

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