The phases and magnetic properties of Co_(77)Zr_(18-x)B_xMo_5(x = 1.0,1.5,2.0,2.5,and 4.0) are studied by X-ray diffraction analysis and magnetic measurements.Proper addition of Ti could improve the magnetic properties of Co-Zr alloy significantly.The largest value of H_c= 7.0 kOe(1 Oe = 79.5775 A/m) is obtained in the Co_(77)Zr_(16)Mo_5B_2 melt-spun ribbon.The grain size of Co_5Zr phase decreases with the increase of B content,which contributes significantly to the enhancement of exchange-coupling effect.T...