The effect of the heating rate on the nucleation of metallic glass in a rapid heating process starting from the glass transition temperature is investigated. The critical nucleus radius increases with the increase of ...The effect of the heating rate on the nucleation of metallic glass in a rapid heating process starting from the glass transition temperature is investigated. The critical nucleus radius increases with the increase of the temperature of the undercooling liquid. If the increment rate of the critical nucleus radius, owing to the heating process, is higher than the growth rate of the nuclei, the nuclei generated at the low temperature will become the embryos at the high temperature. This means that the high heating rate can make no nucleation happen in the heating process. In consideration of the interfacial energy, the growth rate of the nuclei increases with the increase of their size and the growth rate of the critical nucleus is zero. Thus, the lower heating rate can also make the nuclei decline partially. Finally, this theory is used to analyze the nucleation process during laser remelting metallic glass.展开更多
2018 年8 月国际物品编码中心发布了《GS1 WebURI Structure Standard》,即《GS1 Web URI 结构标准》,GS1 Web URI 是将GS1 编码体系与Web URI 两者结合,在Web 地址中实现GS1 标识代码的一致性表示,以链接到在线产品的信息与服务,具有...2018 年8 月国际物品编码中心发布了《GS1 WebURI Structure Standard》,即《GS1 Web URI 结构标准》,GS1 Web URI 是将GS1 编码体系与Web URI 两者结合,在Web 地址中实现GS1 标识代码的一致性表示,以链接到在线产品的信息与服务,具有实现供应链产品标识与网络产品链接两种功能。GS1 Web URI 编码的主要数据载体是以GS1 DataMatrix 为主的二维条码。展开更多
基金Project supported by the National Natural Science Foundation of China(Grant No.50971102)the Specialized Research Fund for the Doctoral Program of Higher Education of China(Grant No.20116102110016)+1 种基金the National Basic Research Program of China(Grant No.2011CB610402)the Fund of the State Key Laboratory of Solidification Processing in Northwestern Polytechnical University,China(Grant No.SKLSP201306)
文摘The effect of the heating rate on the nucleation of metallic glass in a rapid heating process starting from the glass transition temperature is investigated. The critical nucleus radius increases with the increase of the temperature of the undercooling liquid. If the increment rate of the critical nucleus radius, owing to the heating process, is higher than the growth rate of the nuclei, the nuclei generated at the low temperature will become the embryos at the high temperature. This means that the high heating rate can make no nucleation happen in the heating process. In consideration of the interfacial energy, the growth rate of the nuclei increases with the increase of their size and the growth rate of the critical nucleus is zero. Thus, the lower heating rate can also make the nuclei decline partially. Finally, this theory is used to analyze the nucleation process during laser remelting metallic glass.
文摘2018 年8 月国际物品编码中心发布了《GS1 WebURI Structure Standard》,即《GS1 Web URI 结构标准》,GS1 Web URI 是将GS1 编码体系与Web URI 两者结合,在Web 地址中实现GS1 标识代码的一致性表示,以链接到在线产品的信息与服务,具有实现供应链产品标识与网络产品链接两种功能。GS1 Web URI 编码的主要数据载体是以GS1 DataMatrix 为主的二维条码。
