High-throughput CuZr-based Amorphous Composites Preparation

The unique atomic structure of amorphous alloys has many excellent physical,chemical and mechanical properties,which has become a research hotspot in the field of materials.However,due to the absence of dislocation and other defects in the crystal structure,the amorphous alloy will have catastrophic brittle fracture under load,which seriously limits its practical application as a structural material.By developing amorphous composites,the room temperature brittleness,plasticity and working hardening ability of amorphous alloys can be improved obviously.At present,the speed of traditional research and development of amorphous composite materials has been unable to keep up with the growing demand of modern social science and technology,so a new material research and development mode is urgently needed to improve the efficiency of research and development.Based on the above problems,this paper takes(Zr0.5Cu0.5)100-xAlx(x=0,2,3...9,10)alloy as the research system.Coaxial powder feeding laser 3D printing process is adopted to adjust the laser power and powder feeding amount,prepared a series of(Zr0.5Cu0.5)100-xAlx(x=0,2,3...9,10)alloy with high-throughput experimental method.Firstly,the effects of different laser power on the phase composition and microstructure of Cu50Zr50 alloy were studied.Secondly,the high-throughput composite material library was summarized and analyzed by XRD,SEM and EDS testing techniques.The dependence of microstructure on alloy composition and cooling rate under the alloy system was studied,and a two-dimensional picture of cooling rate,composition and microstructure was drawn.It was found that the addition of Al element could improve the glass forming ability of Cu50Zr50 alloy system,promote the formation of metastable austenite CuZr phase,and form a composite structure with a single B2-CuZr phase in the alloy with Al content of 3-8%.The ANSYS finite element simulation software was used to analyze the temperature field of the solidification process of different diameter samples by water-cooled copper mold suction casting method.The average cooling rate of different diameter samples was calculated.The relationship between suction casting diameter and cooling rate was studied.At the same time,the finite element analysis of the temperature field of laser 3D printing single-pass alloy under different power was carried out.By controlling a single variable,the influence of laser power on the cooling rate of material processing was studied.The cooling rate of the alloy during the solidification process was compared.The actual laser 3D printing test was compared with the simulation results to verify the feasibility of high-throughput experiments.