초록 ▼

A method of forming bulk metallic glass engineering materials, and more particularly a method for forming coarsening microstructures within said engineering materials is provided. Specifically, the method forms ‘designed composites’ by introducing ‘soft’ elastic/plastic inhomogeneities in a metallic

A method of forming bulk metallic glass engineering materials, and more particularly a method for forming coarsening microstructures within said engineering materials is provided. Specifically, the method forms ‘designed composites’ by introducing ‘soft’ elastic/plastic inhomogeneities in a metallic glass matrix to initiate local shear banding around the inhomogeneity, and matching of microstructural length scales (for example, L and S) to the characteristic length scale RP (for plastic shielding of an opening crack tip) to limit shear band extension, suppress shear band opening, and avoid crack development.

대표청구항 ▼

What is claimed is: 1. A method of forming a bulk metallic glass composite material comprising:providing a bulk metallic glass comprising a plurality of dendrites dispersed within a glassy matrix, said bulk metallic glass being provided at a temperature below the glass transition temperature of the

What is claimed is: 1. A method of forming a bulk metallic glass composite material comprising:providing a bulk metallic glass comprising a plurality of dendrites dispersed within a glassy matrix, said bulk metallic glass being provided at a temperature below the glass transition temperature of the bulk metallic glass;heating the bulk metallic glass to a composite formation temperature above the solidus temperature and below the liquidus temperature of the bulk metallic glass such that the glassy phase of the bulk metallic melts to form a bulk metallic glass solution comprising the plurality of dendrites homogenously distributed within the liquid glassy phase;holding the bulk metallic glass at the composite formation temperature until the microstructural length of the plurality of dendrites increases until said microstructural length is on the order of the theoretical length scale (Rp) for plastic shielding of an opening crack tip for the bulk metallic qlass; andquenching the bulk metallic glass to below the glass transition temperature of the bulk metallic glass to form a bulk metallic glass composite material comprising the plurality of dendrites homogenously disposed within the glassy matrix.