The effects of Ti on the phase constituent

microstructure and room-temperature mechanical properties of CrCoNi MEA with various Ti ratios which were prepared by arc melting and drop casting were investigated by using X-ray diffractometer and scanning electron microscope

and the compressive properties and hardness were tested.The results show that the crystalline structure is changed from the initial single face-centered cubic（FCC）structure（x≤0.1）to a duplex FCC plus Ni-Ti-rich phase（0.2≤x≤0.3）and then a third Cr-rich phase（x=0.4）with the Ti ratio increase.The as-cast microstructure is transformed from columnar grains to equiaxed grains at x=0.4.The change of yield stress can be ignored with a few addition of Ti

however the yield strength value is increased remarkably with the presence of the second phases.The maximum value of yield strength is achieved of1 712.6 MPa at x=0.3

and a good trade-off between yield stress and ductility is acquired at x=0.4.