冷喷沉积行为的原子模拟

IF 2.7 3区 物理与天体物理 Q2 PHYSICS, APPLIED Journal of Applied Physics Pub Date : 2024-09-09 DOI:10.1063/5.0218416
Jianrui Feng, Erfeng An, Wensen Zhao
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引用次数: 0

摘要

冷喷是一种有效的表面涂层方法,已被应用于多个工程领域。然而,在实验中很难直接观察到动态变形过程。本文应用分子动力学模拟建立了单晶铜粒子在铜基底上的沉积模型,并随后对沉积机理和微观结构演变进行了系统研究。结果表明,沉积过程由碰撞阶段和弛豫阶段组成。主要是高速碰撞和碰撞后的摩擦导致颗粒沉积,在不同情况下,可定义为表面沉积或渗透沉积。急剧的剪切变形和松弛阶段的冷却这两种方法有助于形成纳米晶体。喷射和熔化并不是纳米级颗粒沉积的必要因素。位错线的形成受冲击速度的影响。在较低的冲击速度下,位错线主要分布在接触面附近。然而,当冲击速度较高时,位错线几乎均匀地分布在颗粒中。
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Atomistic simulation on the deposition behavior of cold spray
Cold spray is an effective method for surface coating, which has been applied in various engineering areas. However, it is difficult to directly observe the dynamic deformation process in experiments. This paper applies the molecular dynamics simulation to model the deposition of a monocrystalline Cu particle onto a Cu substrate and, subsequently, carries out a systematic study on the deposition mechanism and microstructure evolution. The results indicate that the deposition process consists of an impact stage and a relaxation stage. It is mainly the high speed collision and the friction following the collision that lead to particle deposition, which, under different circumstances, can be defined as surface deposition or penetration deposition. Two methods, namely, drastic shear deformation and cooling in the relaxation stage, can help form nanocrystallines. Jetting and melting are not the necessary factors for the deposition of nano-sized particles. The formation of dislocation lines is influenced by impact velocities. At lower impact velocities, the dislocation lines are mainly distributed near the contact surface. However, when the impact velocity is higher, dislocation lines are almost uniformly distributed in the particle.
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来源期刊
Journal of Applied Physics
Journal of Applied Physics 物理-物理:应用
CiteScore
5.40
自引率
9.40%
发文量
1534
审稿时长
2.3 months
期刊介绍: The Journal of Applied Physics (JAP) is an influential international journal publishing significant new experimental and theoretical results of applied physics research. Topics covered in JAP are diverse and reflect the most current applied physics research, including: Dielectrics, ferroelectrics, and multiferroics- Electrical discharges, plasmas, and plasma-surface interactions- Emerging, interdisciplinary, and other fields of applied physics- Magnetism, spintronics, and superconductivity- Organic-Inorganic systems, including organic electronics- Photonics, plasmonics, photovoltaics, lasers, optical materials, and phenomena- Physics of devices and sensors- Physics of materials, including electrical, thermal, mechanical and other properties- Physics of matter under extreme conditions- Physics of nanoscale and low-dimensional systems, including atomic and quantum phenomena- Physics of semiconductors- Soft matter, fluids, and biophysics- Thin films, interfaces, and surfaces
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