零热膨胀金属材料研究进展

宋玉柱, 张济民, 周畅, 施耐克, 陈骏

Research Progress on Zero Thermal Expansion Metallic Materials

SONG Yuzhu, ZHANG Jimin, ZHOU Chang, SHI Naike, CHEN Jun

图4 Invar合金的热膨胀、磁结构以及热力学模拟分析[48]

Fig.4 Calculated spin configurations at Fe (orange) and Ni (blue) atoms in fully ordered ferromagnetic states (0 K), ambient states, and paramagnetic states (The size of the arrow is proportional to the calculated magnetic moment)[48] (a), the relationship between the magnetization of Invar alloy and the pressure (P)[48] (b), comparison of linear expansion of Invar alloy, Fe, Cu and Al (Δl / l0—relative length variation) (c), change of phonon entropy and magnetic entropy of Invar alloy with pressure (Sph—phonon entropy; ΔSmag—magnetic entropy change)[48] (d), and change of the sum of phonon entropy and magnetic entropy (ΔSph—phonon entropy change)[48] (e)