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Nanostructure formation and its effects on the mechanical properties of kinetic sprayed titanium coating

机译：纳米结构的形成及其对动力喷涂钛涂层力学性能的影响

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摘要

The nanostructure formation during kinetic spraying of commercially pure titanium (CP-Ti) were studied using transmission electron microscopy (TEM) and finite element modeling (FEM) considering conductive heat transfer. The high-velocity impacted particles, subjected to severe plastic deformation (SPD), were found to be tightly bonded, and also considerably homogeneous and randomly orientated equiaxed nanograins, including some recovered grains having a low dislocation density, were found to be formed over wide areas inside the coating due to strain accumulation and the resultant thermal history enhanced by subsequent impacts of the particles. The bimodal grain structure consisting of both larger grains having high-density dislocations (>250 nm) and smaller dislocation-free grains with non-equilibrium grain boundaries (<100nm) was determined to be associated with both the strain hardening and the ductile dimple fracture of the coating.
机译：在商业喷涂纯钛（CP-Ti）的动态喷涂过程中，使用透射电子显微镜（TEM）和有限元建模（FEM）研究了考虑导热传热的纳米结构。发现高速撞击的颗粒经受了严重的塑性变形（SPD），并紧密结合，并且还发现在宽广范围内形成了相当均匀且随机取向的等轴纳米晶粒，包括一些位错密度低的回收晶粒。由于应变的积累，涂层内部的面积增加了，由此产生的热历史因颗粒的后续冲击而增强。确定了由具有高密度位错的较大晶粒（> 250 nm）和具有不平衡晶界的较小的无位错晶粒（<100nm）组成的双峰晶粒结构与应变硬化和韧性凹痕断裂有关涂层的

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  • 来源
    《Materials Science and Engineering》 |2010年第23期|p.6313-6319|共7页
  • 作者

    Gyuyeol Bae; Kicheol Kang; Jay-Jung Kim; Changhee Lee;

  • 作者单位

    Kinetic Spray Coating Laboratory (NRL), Division of Materials Science & Engineering, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul 133-791, Republic of Korea;

    rnKinetic Spray Coating Laboratory (NRL), Division of Materials Science & Engineering, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul 133-791, Republic of Korea;

    Department of Mechanical Engineering, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul 133-791, Republic of Korea;

    rnKinetic Spray Coating Laboratory (NRL), Division of Materials Science & Engineering, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul 133-791, Republic of Korea;

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  • 正文语种 eng
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  • 关键词

    kinetic (or cold) spraying; finite element method; titanium; severe plastic deformation; grain refinement; nanostructured materials;

    机译：动力（或冷）喷涂;有限元法钛;严重的塑性变形;晶粒细化纳米结构材料;

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