Method for achieving Co-20at.% Pd alloy hypercooling fast solidification

Abstract

The invention discloses a method for achieving Co-20at.% Pd alloy hypercooling fast solidification. The method comprises the following steps that S1, deep supercooling of alloy melt is achieved by means of a high-frequency electromagnetic induction smelting method, wherein the alloy adopts complete-mutual-melting binary single-phase solid solution Co-20at.% Pd alloy; and S2, Ga-In-Sn liquid alloy is taken as a rapid-quenching medium, and the alloy melt with a certain primary supercooling degree is subjected to rapid-quenching treatment after recalescence, wherein the specific substeps include that a certain volume of Ga-In-Sn alloy liquid is rapidly injected into a crucible containing the alloy melt, meanwhile, an infrared thermometer is used for acquiring recalescence-cooling temperature data of the alloy melt, and since the alloy temperature drops suddenly, accordingly the fast solidification induction plastic deformation structure is obtained. According to the method provided by the invention, a cyclical superheating method is used for achieving Co-20at.% Pd alloy hypercooling fast solidification.

Description

technical field [0001] The invention relates to the field of metal material processing, in particular to a method for realizing rapid solidification of a Co-20at.% Pd alloy beyond cold. Background technique [0002] After proper purifying melt treatment, the heterogeneous nucleation of the alloy at low undercooling will be suppressed, and then the alloy can obtain a large undercooling, or even supercooling. So far, the physical definition of super cold has been very clear, that is, in the super cold state, the alloy melt will solidify without segregation and segregation. Such as figure 1 (a) C1 composition alloy as an example, the physical description of supercooling is: when the supercooled melt is cooled to T X (T X Usually at the solidus temperature T s and T 0 Between the line temperature) a certain temperature T below N , due to the large degree of supercooling on the interface (T L -T N ), at this time, the nucleation rate is usually very high, accompanied by t...

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Problems solved by technology

In the past, the theoretical and experimental studies on non-equilibrium solidification and recrystallization were independent of each other, and the role of non-equilibrium effects in the extreme non-equilibrium solidification process was not considered, resulting in long-term progress in the research on the two closely related physical processes of non-equilibrium solidification and solid-state recrystallization. slow

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