冯瑞成,董建勇,李海燕,董赟,雷春丽,靳伍银.工艺参数对Ni/Fe金属热喷涂影响的分子动力学模拟[J].稀有金属材料与工程,0,():-.[Ruicheng Feng,Jianyong Dong,Haiyan Li,Yun Dong,Chunli Lei,Wuyin Jin.Molecular dynamics simulation of the effect of process parameters on Ni/Fe metal thermal spraying[J].Rare Metal Materials and Engineering,0,():-].
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工艺参数对Ni/Fe金属热喷涂影响的分子动力学模拟
投稿时间:2020-04-10  修订日期:2020-06-12
中文关键词:  热喷涂  团簇温度  基体缺陷  团簇形貌  分子动力学
基金项目:中国学术委员会(201808625035);国家自然科学基金委(51865027);兰州理工大学红柳一级学科建设项目
中文摘要:
      本文采用分子动力学模拟方法研究不同工艺参数下热喷涂材料的沉积现象。模拟温度、团簇尺寸和喷涂速度对Fe基体上Ni团簇沉积的影响,分析团簇的形貌和基底的亚表面损伤。结果表明,在Ni团簇升温过程中,熔点随团簇尺寸增大而增高,Ni团簇完全熔融在1800 K左右。喷涂过程中,基体因冲击力至无序原子呈“山”型。此外,喷涂速度在沉积过程中起重要作用。在较低喷涂速度下,基体的展平比较低,但在较高喷涂速度下,基体受团簇冲击后会出现空位和原子团簇等缺陷。因此,热喷涂过程存在临界喷涂速度机制。
Molecular dynamics simulation of the effect of process parameters on Ni/Fe metal thermal spraying
英文关键词:thermal spray  cluster temperature  substrate defect  cluster morphology  molecular dynamics
英文摘要:
      In this paper, molecular dynamics simulations are performed to study the deposition phenomenon of the thermal spraying material under different process parameters. The effects of temperatures, cluster size and spraying speed on the deposition of Ni clusters on the Fe substrate are simulated. The morphology of clusters and the subsurface damage of the substrate are analyzed. The results show that in the heating up process of Ni cluster, the melting point is higher with the increase of cluster size, and the complete melting temperature of Ni cluster is about 1800 K. During the spraying process, the matrix shows a "mountain" shaped due to the impact force to disordered atoms. Furthermore, it is also found that spraying speed plays an important role in the deposition process. At lower spraying speed the flattening ratio decreases again, but at higher the spraying speed the substrate has defects, such as vacancy and atomic cluster after the impact of clusters. Thus, there is a critical spraying speed mechanism in thermal spraying.
作者单位
冯瑞成 兰州理工大学 机电工程学院 
董建勇 兰州理工大学 机电工程学院 
李海燕 兰州理工大学 机电工程学院 
董赟 兰州理工大学 机电工程学院 
雷春丽 兰州理工大学 机电工程学院 
靳伍银 兰州理工大学 机电工程学院 
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