纳米颗粒诱导金属的异常熔化和凝固行为。

Nanoparticle-induced unusual melting and solidification behaviours of metals.

机构信息

Department of Mechanical and Aerospace Engineering, University of California at Los Angeles, Los Angeles, California 90095, USA.

Department of Engineering Technology and Industrial Distribution, Texas A&M University, College Station, Texas 77843, USA.

出版信息

Nat Commun. 2017 Jan 18;8:14178. doi: 10.1038/ncomms14178.

DOI:10.1038/ncomms14178

PMID:28098147

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5253640/

Abstract

Effective control of melting and solidification behaviours of materials is significant for numerous applications. It has been a long-standing challenge to increase the melted zone (MZ) depth while shrinking the heat-affected zone (HAZ) size during local melting and solidification of materials. In this paper, nanoparticle-induced unusual melting and solidification behaviours of metals are reported that effectively solve this long-time dilemma. By introduction of AlO nanoparticles, the MZ depth of Ni is increased by 68%, while the corresponding HAZ size is decreased by 67% in laser melting at a pulse energy of 0.18 mJ. The addition of SiC nanoparticles shows similar results. The discovery of the unusual melting and solidification of materials that contain nanoparticles will not only have impacts on existing melting and solidification manufacturing processes, such as laser welding and additive manufacturing, but also on other applications such as pharmaceutical processing and energy storage.

摘要

有效控制材料的熔化和凝固行为对于许多应用至关重要。在局部熔化和凝固过程中，增加熔化区（MZ）深度同时缩小热影响区（HAZ）尺寸一直是一个长期存在的挑战。本文报道了纳米颗粒诱导的金属异常熔化和凝固行为，有效地解决了这一长期存在的难题。通过引入 AlO 纳米颗粒，在脉冲能量为 0.18mJ 的激光熔化过程中，Ni 的 MZ 深度增加了 68%，而相应的 HAZ 尺寸减小了 67%。添加 SiC 纳米颗粒也得到了类似的结果。这一发现不仅将对现有的熔化和凝固制造工艺（如激光焊接和增材制造）产生影响，而且将对制药加工和储能等其他应用产生影响。