Nanoextruded NbTi superconductor nanowires investigated using molecular dynamics simulations

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• 作者：Bao-Hsin Liu ; Quang-Cherng Hsu ; Cheng-Da Wu
• 刊名：Applied Physics A: Materials Science & Processing
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：122
• 期：4
• 全文大小：3,629 KB
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• 作者单位：Bao-Hsin Liu (1)
  Quang-Cherng Hsu (1)
  Cheng-Da Wu (2)
  
  1. Department of Mechanical Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung, 807, Taiwan
  2. Department of Mechanical Engineering, Chung Yuan Christian University, 200, Chung Pei Road, Chung Li District, Taoyuan, 32023, Taiwan
  
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Condensed Matter
  Optical and Electronic Materials
  Nanotechnology
  Characterization and Evaluation Materials
  Surfaces and Interfaces and Thin Films
  Operating Procedures and Materials Treatment
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-0630

文摘

The effects of extrusion temperature, extrusion ratio, and workpiece size on the extrusion process of NbTi alloy nanowires (workpieces) are studied using the modified embedded atom method potential. The results are discussed in terms of atomic trajectories, potential energy, extrusion force, and stress. Simulation results show that the workpiece atoms near the ram lose their structural order when the extrusion process begins. The number of disordered atoms gradually increases with increasing ram displacement in order to relax the increasing pressure from the ram. The extrusion force and potential energy increase with increasing temperature. The effect of extrusion ratio dominates the extrusion force once the workpiece atoms start entering the mold opening. A large extrusion force is required for large workpieces with a small extrusion ratio; however, a small workpiece with a large extrusion ratio could lead to high peaks and a large oscillation in the force curve.