The mechanical alloying process of Nb and Cr mixed powder（1:2 in molar ratio） has been analyzed by high energy ball milling for Nb-Cr binary alloy powder in case of the mass ratio of steel ball to powder of 13:1

and the phase constituent of the Nb-Cr powders has been observed by XRD（X-ray diffraction）.The results reveal that firstly

the Nb（Cr） solid solution phase can be formed with ball milling for 20 h

then amorphous phase appears after 45 h

further

the crystallization of amorphous phase occurs for 159 h.The thermo-kinetic model of mechanical alloy process of Nb-Cr series has been established by referring to the Miedema semi-empiric theory to describe the phase transformation of Nb-Cr system during milling.The thermo-kinetic simulation verifies that the Nb-Cr binary system possesses thermo-kinetic driving force forming amorphous phase

solid solution phase and compound.The simulated results are well in agreement with the XRD analysis ones.