Effects of MM on the microstructure and fluidity of Cu-30Ni-20Fe-5Al alloy

which was prepared by vacuum melting with various MM content

were investigated by SEM（scanning electron microscope）and XRD（X-ray diffraction）.The results show that as-cast Cu-30Ni-20Fe-5Al alloy is composed of α-Cu and NiAl phase

where NiAl phase is distributed in form of irregular ring-shape with Fe enrichment at the both inner and outer sides.The NiAl phase becomes spherical and rod-like structure with the addition of MM addition

and MM-enrichment phase is segregated at the grain boundary.NiAl phase exhibits the desirable spherical structure in the alloy with 0.78% MM addition.Compared to the alloy without MM element addition

the length of spiral samples is increased by 25%

showing the best fluidity.