Precipitation reactions in the differential scanning calorimetry (DSC) of an Al-Cu-Mg-Ag alloy were identified by analyzing the results from hardness test,electrical conductivity test,and transmission electron micro...Precipitation reactions in the differential scanning calorimetry (DSC) of an Al-Cu-Mg-Ag alloy were identified by analyzing the results from hardness test,electrical conductivity test,and transmission electron microscope (TEM) examination.It is discovered that thermal effects can be identified through selected area electron diffraction and bright-field images.The reaction peaks around 171,231,and 276℃ can be attributed to a structural rearrangement of coherent zones,to the precipitation of Ω phases,and to the precipitation of Ω and θ' and possible combination with the transition of θ'→θ,respectively.In addition,the hardness and electrical conductivity of the alloy change proportionately with the progression of reactions during the heating process.This phenomenon can be attributed to the evolution of the micro-structure.展开更多
借助DSC、SEM分析 ,分别对Ti ZrO2 体系、Ti Al ZrO2 体系、Ti B Al ZrO2 体系中Ti和ZrO2 的界面反应进程及初始反应温度进行了研究。结果发现 :随着Al、B及微量添加剂的加入 ,Ti和ZrO2 的初始反应温度逐步升高 ;Ti Al ZrO2 和Ti B Al Z...借助DSC、SEM分析 ,分别对Ti ZrO2 体系、Ti Al ZrO2 体系、Ti B Al ZrO2 体系中Ti和ZrO2 的界面反应进程及初始反应温度进行了研究。结果发现 :随着Al、B及微量添加剂的加入 ,Ti和ZrO2 的初始反应温度逐步升高 ;Ti Al ZrO2 和Ti B Al ZrO2 体系与Ti ZrO2 体系相比较 ,Ti和ZrO2 初始反应温度分别提高近 5 0℃和70℃ ,从而弱化了Ti和ZrO2展开更多
文摘Precipitation reactions in the differential scanning calorimetry (DSC) of an Al-Cu-Mg-Ag alloy were identified by analyzing the results from hardness test,electrical conductivity test,and transmission electron microscope (TEM) examination.It is discovered that thermal effects can be identified through selected area electron diffraction and bright-field images.The reaction peaks around 171,231,and 276℃ can be attributed to a structural rearrangement of coherent zones,to the precipitation of Ω phases,and to the precipitation of Ω and θ' and possible combination with the transition of θ'→θ,respectively.In addition,the hardness and electrical conductivity of the alloy change proportionately with the progression of reactions during the heating process.This phenomenon can be attributed to the evolution of the micro-structure.
文摘借助DSC、SEM分析 ,分别对Ti ZrO2 体系、Ti Al ZrO2 体系、Ti B Al ZrO2 体系中Ti和ZrO2 的界面反应进程及初始反应温度进行了研究。结果发现 :随着Al、B及微量添加剂的加入 ,Ti和ZrO2 的初始反应温度逐步升高 ;Ti Al ZrO2 和Ti B Al ZrO2 体系与Ti ZrO2 体系相比较 ,Ti和ZrO2 初始反应温度分别提高近 5 0℃和70℃ ,从而弱化了Ti和ZrO2