中国物理B ›› 2020, Vol. 29 ›› Issue (6): 66201-066201.doi: 10.1088/1674-1056/ab84d5

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

Balancing strength and plasticity of dual-phase amorphous/crystalline nanostructured Mg alloys

Jia-Yi Wang(王佳怡), Hai-Yang Song(宋海洋), Min-Rong An(安敏荣), Qiong Deng(邓琼), Yu-Long Li(李玉龙)   

  1. 1 College of Material 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:2020-02-02 修回日期:2020-03-29 出版日期:2020-06-05 发布日期:2020-06-05
  • 通讯作者: Hai-Yang Song, Yu-Long Li E-mail:gsfshy@sohu.com;liyulong@nwpu.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 11572259), the Natural Science Foundation of Shaanxi Province, China (Grant Nos. 2018JM101 and 2019JQ-827), and the Program for Graduate Innovation Fund of Xi'an Shiyou University, China (Grant No. YCS19111004).

Balancing strength and plasticity of dual-phase amorphous/crystalline nanostructured Mg alloys

Jia-Yi Wang(王佳怡)1,2, Hai-Yang Song(宋海洋)1, Min-Rong An(安敏荣)1, Qiong Deng(邓琼)2, Yu-Long Li(李玉龙)2   

  1. 1 College of Material Science and Engineering, Xi'an Shiyou University, Xi'an 710065, China;
    2 School of Aeronautics, Northwestern Polytechnical University, Xi'an 710072, China
  • Received:2020-02-02 Revised:2020-03-29 Online:2020-06-05 Published:2020-06-05
  • Contact: Hai-Yang Song, Yu-Long Li E-mail:gsfshy@sohu.com;liyulong@nwpu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 11572259), the Natural Science Foundation of Shaanxi Province, China (Grant Nos. 2018JM101 and 2019JQ-827), and the Program for Graduate Innovation Fund of Xi'an Shiyou University, China (Grant No. YCS19111004).

摘要: The dual-phase amorphous/crystalline nanostructured model proves to be an effective method to improve the plasticity of Mg alloys. The purpose of this paper is to explore an approach to improving the ductility and strength of Mg alloys at the same time. Here, the effect of amorphous phase strength, crystalline phase strength, and amorphous boundary (AB) spacing on the mechanical properties of dual-phase Mg alloys (DPMAs) under tensile loading are investigated by the molecular dynamics simulation method. The results confirm that the strength of DPMA can be significantly improved while its excellent plasticity is maintained by adjusting the strength of the amorphous phase or crystalline phase and optimizing the AB spacing. For the DPMA, when the amorphous phase (or crystalline phase) is strengthened to enhance its strength, the AB spacing should be increased (or reduced) to obtain superior plasticity at the same time. The results also indicate that the DPMA containing high strength amorphous phase exhibits three different deformation modes during plastic deformation with the increase of AB spacing. The research results will present a theoretical basis and early guidance for designing and developing the high-performance dual-phase hexagonal close-packed nanostructured metals.

关键词: dual-phase Mg alloy, metallic glass, mechanical property, molecular dynamics simulation

Abstract: The dual-phase amorphous/crystalline nanostructured model proves to be an effective method to improve the plasticity of Mg alloys. The purpose of this paper is to explore an approach to improving the ductility and strength of Mg alloys at the same time. Here, the effect of amorphous phase strength, crystalline phase strength, and amorphous boundary (AB) spacing on the mechanical properties of dual-phase Mg alloys (DPMAs) under tensile loading are investigated by the molecular dynamics simulation method. The results confirm that the strength of DPMA can be significantly improved while its excellent plasticity is maintained by adjusting the strength of the amorphous phase or crystalline phase and optimizing the AB spacing. For the DPMA, when the amorphous phase (or crystalline phase) is strengthened to enhance its strength, the AB spacing should be increased (or reduced) to obtain superior plasticity at the same time. The results also indicate that the DPMA containing high strength amorphous phase exhibits three different deformation modes during plastic deformation with the increase of AB spacing. The research results will present a theoretical basis and early guidance for designing and developing the high-performance dual-phase hexagonal close-packed nanostructured metals.

Key words: dual-phase Mg alloy, metallic glass, mechanical property, molecular dynamics simulation

中图分类号:  (Mechanical properties of nanoscale systems)

  • 62.25.-g
64.70.pe (Metallic glasses) 61.82.Bg (Metals and alloys) 31.15.xv (Molecular dynamics and other numerical methods)