Additive-equal Material Fabrication and Microstructural Properties of High Entropy Aluminide Microlaminated Composites
The work aims to study the formability of high entropy alloy(HEA)and Al reinforced composites using the tech-nique of additive-equal material fabrication,as well as the microstructure and mechanical properties of the prepared high en-tropy aluminide microlaminated composites.Firstly,the formability of the composites in the preparation process of addi-tive-equal material fabrication was studied.Subsequently,the microstructure and growth kinetics of the composites'aluminide layer were analyzed by SEM,EDS,and XRD.Finally,the mechanical properties of the composites were investigated from the perspectives of microhardness,three-point bend,fracture toughness,and dynamic compressive strength.The physical objects fabricated by laser sintering melting exhibited no obvious macroscopic defects such as warping or bending,while the compos-ites fabricated by vacuum drift casting contained more voids,with some areas showing larger defects,and the aluminide com-posites fabricated by vacuum hot press sintering behaved very tightly.The diffusion behaviour of composites involved the diffu-sion of high entropy alloys into the Al layer,where Al underwent minimal diffusion.The microhardness of the aluminide layer was higher than that of the as-cast and spark plasma sintering prepared high entropy alloy.Near the Al layer,there was a de-crease in hardness.The three-point bend and fracture toughness decreased with increasing reaction time.The dynamic compres-sive strength increased with prolonged reaction time.High entropy aluminide microlaminated composites prepared by addi-tive-equal material fabrication has good formability.The microstructure composition of the aluminide layer of the composites is Al3(Co Cr Fe Ni),the aluminide diffusion layer shows a hybrid growth controlled by internal diffusion and interfacial reactions.The thickness of the aluminide layer has a significant impact on the performance of the composites.As the thickness increases,the three-point bend and fracture toughness of the composites decreases while the dynamic compressive strength increases.
additive-equal material fabricationmicrolaminated compositeshigh entropy alloydynamic compressive strengthfracture toughness
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