稀土元素对非晶态PdSi_(16.5)合金热稳定性的影响

INFLUENCE OF RARE-EARTH ELEMENTS ON THERMAL STABILITY OF PdSi_(16.5) GLASS

采用DSC系统地研究了稀土元素La,Ce,Pr,Nd,Sm,Eu,Gd,Dy,Ho,Er,Yb对PdSi_(16.5)非晶态合金热稳定性的影响。所有稀土元素明显地提高各项热稳定性参数,包括T_θ(T_g,T_x,T_p),T_(rg)和ΔE等,尤以重稀土元素的影响更显著,且结晶温度T_(P1)和T_(P2)随La系收缩直线增大。Eu显示出反常的影响:含Eu合金具有最高稳定性,而其形成非晶态的浓度范围却低于其它稀土元素。

The influence of rare-earth elements, La, Ce, Pr, Nd, Sm, Eu, Gd,Dy, Ho, Br and Yb on the thermal stabitity of PdSi_(16.5) glass wae studied systemati-cally by means of DSC. All rare-earth elements, especially heavy ones, increase ob-viously the thermal stability parameters, including T_A (T_g,T_x,T_p), T_(rg) and ΔE etc.The crystallization temperature T_(p1) and T_(p2) increase linearly with the lanthanideconstriction increasing, but Eu shows an anomalous influence: Pd-Si-Eu metallicglass possesses the highest thermal stability and the lowest concentration range ofglass forming among Pd-Si-R glasses