采用 DSC和激冷实验对 Al- Ti O2 的 SHS反应过程进行了详细的研究。结果表明 ,Al还原 Ti O2 的过程为 :液态 Al在 Ti O2 颗粒表面铺展并与 Al反应 ,从而在 Ti O2 颗粒周围形成中间产物层 Ti O2 - x,此后还原过程不断通过氧在中间产物层...采用 DSC和激冷实验对 Al- Ti O2 的 SHS反应过程进行了详细的研究。结果表明 ,Al还原 Ti O2 的过程为 :液态 Al在 Ti O2 颗粒表面铺展并与 Al反应 ,从而在 Ti O2 颗粒周围形成中间产物层 Ti O2 - x,此后还原过程不断通过氧在中间产物层 Ti O2 -展开更多
This work investigated the response of Cu46Zr42Al7Y5 glass ribbons to both dynamic and static heating using differential scanning calorimeter （DSC）. The DSC curve manifests three exothermic responses to dynamic heat...This work investigated the response of Cu46Zr42Al7Y5 glass ribbons to both dynamic and static heating using differential scanning calorimeter （DSC）. The DSC curve manifests three exothermic responses to dynamic heating, among which the first and the third one are the signatures of the normal sub-Tg （Tg, glass transition temperature） relaxation and the crystallization process, respectively. The second one is attributed to a partial overlap between the endothermic response to the glass transition and the exothermic response to the formation of ordered clusters. The cluster ordering, which begins at the final stage of glass transition, has been verified by the differences in the activation energy of the sub-Tg relax- ation, the cluster ordering and primary crystallization for both the as-spun and annealed ribbons. The cluster ordering could be driven by the large difference between the Zr-Y mixing enthalpy and the Al-Y （or Cu-Y） mixing enthalpy. The findings contribute to distinguishing between phase separation and clusters motion scenarios.展开更多
文摘采用 DSC和激冷实验对 Al- Ti O2 的 SHS反应过程进行了详细的研究。结果表明 ,Al还原 Ti O2 的过程为 :液态 Al在 Ti O2 颗粒表面铺展并与 Al反应 ,从而在 Ti O2 颗粒周围形成中间产物层 Ti O2 - x,此后还原过程不断通过氧在中间产物层 Ti O2 -
基金supported by the National Natural Science Foundation of China(5117109051571131)the Fundamental Research Funds of Shandong University(2014YQ008)
文摘This work investigated the response of Cu46Zr42Al7Y5 glass ribbons to both dynamic and static heating using differential scanning calorimeter （DSC）. The DSC curve manifests three exothermic responses to dynamic heating, among which the first and the third one are the signatures of the normal sub-Tg （Tg, glass transition temperature） relaxation and the crystallization process, respectively. The second one is attributed to a partial overlap between the endothermic response to the glass transition and the exothermic response to the formation of ordered clusters. The cluster ordering, which begins at the final stage of glass transition, has been verified by the differences in the activation energy of the sub-Tg relax- ation, the cluster ordering and primary crystallization for both the as-spun and annealed ribbons. The cluster ordering could be driven by the large difference between the Zr-Y mixing enthalpy and the Al-Y （or Cu-Y） mixing enthalpy. The findings contribute to distinguishing between phase separation and clusters motion scenarios.
