Research on fatigue crack growth behavior of electron beam surface remelted high entropy alloys
In order to improve the fatigue property of the as-cast AlCoCrFeNi2.1 dual phase high entropy alloy,this as cast alloy was remelted on both sides by electron beam surface remelting.The effects of electron beam remelting on the microstructure,element distribution and microhardness of the alloy were characterized by scanning electron microscope(SEM),energy dispersive spectrometer(EDS)and hardness testing.The fatigue crack growth behavior and mechanism of high entropy alloy after electron beam remelting were studied by means of fatigue crack growth rate(FCGR)test and finite element analysis(FEM).Results show that the electron beam surface remelting can significantly refine the dual phase size,improve the segregation of alloy elements and enhance the surface hardness.The FCGR of this heterostructure composed of remelting zone and heat affected zone decreases significantly,and the front of fatigue crack growth presents an"M"shape.The refinement of the phase size in remelting zone,the residual compressive stress distributed in the heterostructure and the difference in the mechanical properties of the heterostructure are the main reasons for inhibiting the fatigue crack growth.
dual phase high entropy alloyfatigue crack growthEBMheterostructureFEM
万方数据
维普
