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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Non-isothermal and isothermal crystallization kinetics and their effect on microstructure of sintered and crystallized TiNbZrTaSi bulk alloys
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Non-isothermal and isothermal crystallization kinetics and their effect on microstructure of sintered and crystallized TiNbZrTaSi bulk alloys

机译：TiNbZrTaSi块状合金的非等温和等温结晶动力学及其对显微组织的影响

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摘要

Non-isothermal and isothermal,crystallization kinetics of mechanically alloyed Ti65Nb23.33Zr5Ta1.67Si5 metallic glass (MG) powder and their effect on microstructure and mechanical property of spark-plasma-sintered and crystallized bulk counterparts were investigated by using Johnson-Mehl-Avrami-Kolmogorov equation. Results show the MG powder has two distinct crystallization steps, which precipitates bcc beta-Ti and hexagonal (Ti, Zr)(2)Si phases successively. The larger apparent activation energy of the second crystallization step than that for the first one indicates the easier occurrence of precipitation for bcc beta-Ti phase. Comparative analysis of crystallization kinetics indicates that regardless of non-isothermal and isothermal crystallization types, the first crystallization step is dominated by diffusion-controlled three- and two-dimensional growth of nuclei for the early and late crystallization stage, respectively, while the second one is governed by diffusion-controlled three-dimensional growth of nuclei in the whole crystallization process. Both nucleation rates of these two steps increase firstly and then reduce in the early and late crystallization stage, respectively. The processing technologies combined with crystallization kinetics decide different grain sizes and yield strengths for the sintered and crystallized bulk alloys. The results obtained provide a new insight into tailoring microstructure and mechanical property of bulk alloys by designing and optimizing processing technologies based on crystallization kinetics. (C) 2015 Elsevier B.V. All rights reserved.
机译：利用Johnson-Mehl-Avrami- Kolmogorov方程。结果表明，MG粉末具有两个不同的结晶步骤，分别沉淀bccβ-Ti和六方（Ti，Zr）（2）Si相。第二结晶步骤的表观活化能比第一结晶步骤的表观活化能大，表明bccβ-Ti相较容易发生沉淀。结晶动力学的比较分析表明，无论非等温和等温结晶类型如何，在结晶的早期和后期，第一结晶步骤主要由扩散控制的核的二维和二维生长控制，而第二个在整个结晶过程中，核受扩散控制的核的三维生长控制。这两个步骤的两个成核速率分别在结晶的早期和后期先增大然后减小。加工技术与结晶动力学相结合，决定了烧结和结晶块状合金的不同晶粒尺寸和屈服强度。通过设计和优化基于结晶动力学的加工技术，获得的结果为定制大块合金的组织和力学性能提供了新的见识。 （C）2015 Elsevier B.V.保留所有权利。

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