遷移金属−半金属非晶質合金のヤング率への磁気体積効果の寄与

抄録

The temperature dependence of Young's modulus of transition metal-metalloid amorphous alloys, (Fe_1-xM)₈₅B₁₅ (M: Cr, Mn, Co, Ni), (Fe_1-xM_x)₇₇Si₁₀B₁₃ (M: Co, Ni), Fe-B, Fe-P, Co-B, has been measured by a pulse echo delay-line technique in the temperature range from R.T. to 600°C. Young's modulus E_s measured under the saturation of magnetization for Mn and Cr containing alloys shows softening below T_c because of the magnetovolume effect. The contribution of the magnetovolume effect to Young's modulus is quantitatively analysed and its dependence on the electron number per transition metal atoms n_eff is presented. The magnetovolume contribution to Young's modulus passes through a maximum at n_eff∼8.0 and smears above n_eff∼8.3. These results are discussed in connection with the anomalous stress dependence of the magnetovolume coupling constant in the transition metal-metalloid amorphous alloys.