Plastic bulk metallic glass in situ composite material and method for preparing same

Abstract

The invention discloses a plastic bulk metallic glass in situ composite material and a method for preparing the same. In the method, the complex phase metallic materials formed by the rigid brittle second phase are evenly and dispersively distributed on the bulk metallic glass substrate phase. The preparation method comprises the following steps of: selecting bulk metallic glass, making the relative ratio of alloy elements deviate the best glass forming ability by adjusting the relative ratio of alloy elements, obtaining alloy components needed, and making the alloy components separate out the intermetallic compound rigid brittle phase in a solidifying process; by adopting the arc melting method, melting the alloy components obtained in the first step into mother alloy; and re-melting themother alloy, solidification-shaping the melted mother alloy by a metallic die, and by controlling the cooling rate, obtaining the as-cast in situ composite material in which the rigid brittle intermetallic compound second phase is evenly distributed on the metallic glass substrate. Under conditions of keeping high strength and high hardness of the bulk metallic glass (BMG), the method can greatly improve the room-temperature plasticity of the bulk metallic glass.

Description

technical field [0001] The invention belongs to the technology of metal matrix composite materials, in particular to a bulk metallic glass endogenous composite material and a preparation method thereof. Background technique [0002] Since Chen et al. obtained mm-scale amorphous samples in Pd-Au-Si, Pd-Ag-Si and Pd-Cu-Si for the first time by water quenching in 1969, bulk metallic glasses (bulk Metallic glasses (BMG for short) have developed rapidly in the past forty years. A large number of BMG materials with non-noble metals as the main components represented by Zr-Al-Ni-Cu and Zr-Ti-Cu-Ni-Be have been discovered one after another. Today, the engineering application of BMG is just around the corner. However, although BMG materials have high fracture strength and hardness and high elastic strain limit, since the plastic deformation of single-phase metallic glasses is achieved through highly localized shear deformation, the number of shear bands that can be activated before...

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Problems solved by technology

[0004] Although the plasticization effect of the as-cast endogenous solid solution plasticized BMG composites is remarkable, there are two difficulties in the design process of composite materials: first, because the strength of the as-cast endogenous solid solution phase is usually lower than that of the metallic glass matrix, the composite In order to obtain higher plasticity, the material often controls the endogenous solid solution phase in the as-cast state so that it has a larger grain size and volume fraction, which will inevitably lead to a decrease in the strength of the final composite material; second, it is necessary to ensure that the composition of the alloy matrix While having a high glass forming ability (GFA) to obtain a BMG matrix, the composition design is used to make the first precipitated phase a plastic solid solution phase

This necessary condition limits the space available for choice in the composition of materials

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