Non-equilibrium microscale thermomechanical modeling of bimetallic particulate fractal structures during ball milling fabrication
Non-equilibrium microscale thermomechanical modeling of bimetallic particulate fractal structures during ball milling fabrication
复制标题
球磨制造过程中双金属颗粒分形结构的非平衡微尺度热机械建模
DOI：
10.1063/1.4993174
复制
发表时间：
2017
影响因子：
3.2
通讯作者：
C. Doumanidis
中科院分区：
文献类型：
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作者：
M. Aureli;Constantine Doumanidis;I. Gunduz;A. Hussien;Y. Liao;S. Jaffar;C. Rebholz;C. Doumanidis
采用球磨法制备纳米双金属反应层是一种简便的方法。本研究探讨了球磨颗粒分形结构在制造过程中，由体塑性变形和表面摩擦引起的热耗散引起的非平衡微尺度导热热输运。在撞击器碰撞时，使用格林函数确定界面关节和域体积的温度增量，并通过源图像反映弯曲椭球域边界。热源效率通过实验室数据进行校准，以补偿热膨胀和冲击器的非弹性，热分析与颗粒断裂的动态力学模型相结合。该热力学模型与球磨实验观察到的显微组织分形维数吻合较好。该模型旨在提供对基本过程机制的全面物理理解。在添加剂…
Nanostructured bimetallic reactive multilayers can be conveniently produced by ball milling of elemental powders. This research explores the non-equilibrium microscale conductive thermal transport in ball-milled particulate fractal structures during fabrication, arising from heat dissipation by bulk plastic deformation and surface friction. Upon impactor collisions, temperature increments are determined at interface joints and domain volumes using Green's functions, mirrored by source images with respect to warped ellipsoid domain boundaries. Heat source efficiency is calibrated via laboratory data to compensate for thermal expansion and impactor inelasticity, and the thermal analysis is coupled to a dynamic mechanics model of the particulate fracture. This thermomechanical model shows good agreement with the fractal dimensions of the observed microstructure from ball milling experiments. The model is intended to provide a comprehensive physical understanding of the fundamental process mechanism. In addit...