【摘要】 用DSC和DTA测定了淬火态和退火态Pd_83.5-xMzSo_15.6非晶态合金一系列热稳定性参数:T_g,T_x,T_p,T_m,T_liq,T_rg,玻璃转变和结晶激活能ΔE,结晶热ΔH_c,Twyman常数等。发现前过渡金属Hf,Ta,W,Re显著地提高两种状态非晶态合金的热稳定性,后过渡元素Os,Ir,Pt,Ru,Rh对热稳定性影响较小。用Gaskell模型和Engel-Brewer过渡金属电子理论解释了前、后过渡金属对PdSi_16.5非晶态合金热稳定性的不同影响。更多还原

【Abstract】 The thermal stability parameters of metallic glasses Pd_83.5-xM_xSi_16.5, where M denoting Hf, Ta, W, Re, Os, Ir, Pt, Ru, and Rh, as both melt quenched and annealed states T_g, T_x, T_p, T_m, T_liq and T_rg, as well as glass transformation and crystallization activation energy, heat of crystallization, Twyman constant, etc. have been determined by DSC and DTA. It is found that the thermal stability of metallic glasses composed by the preceding transition metals, e.g. Hf, Ta, W and Re is increased obviously, hut by the later ones, e.g. Os, Ir, Pt, Ru and Rh, much less influenced. These behaviour has been discussed by the Gaskell’s model and Engel-Brewer electron theory of transition metals.更多还原