A Zr-RICH LOW MELTING POINT PHASE IN Ni_3Al ALLOY WITH Zr

A Zr-rich phase,Ni_5Zr,with low melting point has been fouhd in an Ni_3Al alloy doped withZr(1.2at.-%).It will cause the incipient melt of the alloy after being homogenized at 1300℃.This makes it difficult to homogenize the coarse casting structures completely and limits thefurther improvement of properties of the Ni_3Al alloy.