中国物理B ›› 2016, Vol. 25 ›› Issue (2): 26802-026802.doi: 10.1088/1674-1056/25/2/026802

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇    下一篇

Effect of amorphous lamella on the crack propagation behavior of crystalline Mg/amorphous Mg-Al nanocomposites

Hai-Yang Song(宋海洋) and Yu-Long Li(李玉龙)   

  1. 1. College of Materials Science and Engineering, Xi'an Shiyou University, Xi'an 710065, China;
    2. School of Aeronautics, Northwestern Polytechnical University, Xi'an 710072, China
  • 收稿日期:2015-07-03 修回日期:2015-08-29 出版日期:2016-02-05 发布日期:2016-02-05
  • 通讯作者: Hai-Yang Song E-mail:gsfshy@sohu.com
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 11372256 and 11572259), the 111 Project (Grant No. B07050), the Program for New Century Excellent Talents in University of Ministry of Education of China (Grant No. NCET-12-1046), and the Program for New Scientific and Technological Star of Shaanxi Province, China (Grant No. 2012KJXX-39).

Effect of amorphous lamella on the crack propagation behavior of crystalline Mg/amorphous Mg-Al nanocomposites

Hai-Yang Song(宋海洋)1 and Yu-Long Li(李玉龙)2   

  1. 1. College of Materials Science and Engineering, Xi'an Shiyou University, Xi'an 710065, China;
    2. School of Aeronautics, Northwestern Polytechnical University, Xi'an 710072, China
  • Received:2015-07-03 Revised:2015-08-29 Online:2016-02-05 Published:2016-02-05
  • Contact: Hai-Yang Song E-mail:gsfshy@sohu.com
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 11372256 and 11572259), the 111 Project (Grant No. B07050), the Program for New Century Excellent Talents in University of Ministry of Education of China (Grant No. NCET-12-1046), and the Program for New Scientific and Technological Star of Shaanxi Province, China (Grant No. 2012KJXX-39).

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摘要：

The effects of amorphous lamella on the crack propagation behavior in crystalline/amorphous (C/A) Mg/Mg-Al nanocomposites under tensile loading are investigated using the molecular dynamics simulation method. The sample with an initial crack of orientation (1210) [0001] is considered here. For the nano-monocrystal Mg, the crack growth exhibits brittle cleavage. However, for the C/A Mg/Mg-Al nanocomposites, the 'double hump' behavior can be observed in all the stress-strain curves regardless of the amorphous lamella thickness. The results indicate that the amorphous lamella plays a critical role in the crack deformation, and it can effectively resist the crack propagation. The above mentioned crack deformation behaviors are also disclosed and analyzed in the present work. The results here provide a strategy for designing the high-performance hexagonal-close-packed metal and alloy materials.

关键词: crystalline/amorphous nanocomposites, cack growth, deformation behavior, molecular dynamics simulation

Abstract:

The effects of amorphous lamella on the crack propagation behavior in crystalline/amorphous (C/A) Mg/Mg-Al nanocomposites under tensile loading are investigated using the molecular dynamics simulation method. The sample with an initial crack of orientation (1210) [0001] is considered here. For the nano-monocrystal Mg, the crack growth exhibits brittle cleavage. However, for the C/A Mg/Mg-Al nanocomposites, the 'double hump' behavior can be observed in all the stress-strain curves regardless of the amorphous lamella thickness. The results indicate that the amorphous lamella plays a critical role in the crack deformation, and it can effectively resist the crack propagation. The above mentioned crack deformation behaviors are also disclosed and analyzed in the present work. The results here provide a strategy for designing the high-performance hexagonal-close-packed metal and alloy materials.

Key words: crystalline/amorphous nanocomposites, cack growth, deformation behavior, molecular dynamics simulation

中图分类号:  (Interface structure and roughness)

  • 68.35.Ct
02.70.Ns (Molecular dynamics and particle methods) 62.20.mt (Cracks)