Research On The Mechanical Processing And Experiment Of High Entropy Alloy

Multi-component high entropy alloy(HEAs)design concept is a new alloy development mentality based on the traditional design of the multi-alloy and broke through the traditional alloy development framework.High-entropy alloy system not only presents a simple microstructure,but also has excellent overall performance.It has the advantages of thermal stability,corrosion resistance,high strength,high hardness,high oxidation resistance and excellent magneto-electrical properties,which becomes a kind of new material with great potential for development and has rich application levels.At present,there is not much research on the mechanical processing of high-entropy alloys,and there is no complete theoretical system in all aspects.Based on the special properties of high-entropy alloys,the mechanical processing mechanism and traditional crystal metal materials will be different.Micro-grinding is a grinding process which uses micro-grinding rod with a diameter of about 1mm on the grinding material.micro-grinding has been widely used in the high-tech industries as the key technology in precision machining.With the development of society,all areas put forward new demands on the product miniaturization,which also presents a new set of challenges for the micro-grinding technology.After years of development micro-grinding technology has become an important processing method which is famous for its high efficiency and high flexibility characteristics.Even so,the research area of micro grinding is still potential and energetic.The machining of high entropy alloy is a field to be developed.In this article,the research on the mechanism of high entropy alloy machining is conducted by the method of finite element analysis and single factor experiment which supplemented by the orthogonal experimental design.The detailed content is as following:(1)The microstructure and material model of high entropy alloy are analyzed:and the similarities and differences between micro-grinding and traditional grinding are summarized,and the micro-scale grinding theory of hard and brittle materials is theoretically discussed.(2)Using DEFORM software to establish single abrasive grain simulation model and single tooth milling model and explore the variation regularity of cutting force,temperature field and stress field in grinding milling process under different machining parameters;Exploring the effects of different negative front angles of abrasive grains on grinding force and grinding temperature.(3)The influences of machining parameters,grinding mode,abrasive material,grinding rod size and diameter on the grinding force of two kinds of high entropy alloy micro-grinding process are analyzed by the single factor experiment.And compared with the traditional crystal material brass H62.The primary and secondary order of the influence of machining parameters on the grinding force is analyzed by the orthogonal experiment.(4)The processing parameters,grinding methods,the influence of abrasive material,grinding rod particle size and diameter on surface quality is analyzed by the single factor experiment,and compared with the traditional crystal material brass H62,and the micro-grinding characteristics of the material are studied;the removal form of the material is investigated by means of debris morphology;The primary and secondary order of the influence of various machining parameters on roughness is analyzed by the orthogonal experiment,and get the optimal parameter combination.