Melting Can Hinder Impact-Induced Adhesion
Melting Can Hinder Impact-Induced Adhesion
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DOI：
10.1103/physrevlett.119.175701
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发表时间：
2017-10-25
影响因子：
8.6
通讯作者：
Schuh, Christopher A.
中科院分区：
文献类型：
--
作者：
Hassani-Gangaraj, Mostafa;Veysset, David;Schuh, Christopher A.
熔化长期以来一直用于连接金属材料，从焊接到增材制造中的选择性激光熔化。在同一流派中，局部熔化通常被认为是超音速冲击期间金属微粒粘附到基材的一种优势，即使不是主要机制。在这里，我们首次对单个金属微粒进行了原位超音速撞击观测，旨在明确研究熔化效应。与直觉相反，我们发现至少在某些条件下熔化是不利的并且阻碍冲击引起的粘合。在所探索的参数空间中，即类似于10μm的颗粒尺寸和类似于1km/s的颗粒速度，我们认为凝固时间比颗粒在基底上的停留时间长得多，因此再凝固不可能是粘附的重要因素。
Melting has long been used to join metallic materials, from welding to selective laser melting in additive manufacturing. In the same school of thought, localized melting has been generally perceived as an advantage, if not the main mechanism, for the adhesion of metallic microparticles to substrates during a supersonic impact. Here, we conduct the first in situ supersonic impact observations of individual metallic microparticles aimed at the explicit study of melting effects. Counterintuitively, we find that under at least some conditions melting is disadvantageous and hinders impact-induced adhesion. In the parameter space explored, i.e., similar to 10 mu m particle size and similar to 1 km/s particle velocity, we argue that the solidification time is much longer than the residence time of the particle on the substrate, so that resolidification cannot be a significant factor in adhesion.