中国物理B ›› 2017, Vol. 26 ›› Issue (12): 126203-126203.doi: 10.1088/1674-1056/26/12/126203

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

Variations in defect substructure and fracture surface of commercially pure aluminum under creep in weak magnetic field

Sergey Konovalov, Dmitry Zagulyaev, Xi-Zhang Chen(陈希章), Victor Gromov, Yurii Ivanov   

  1. 1. Samara National Research University, Samara 443086, Russia;
    2. Wenzhou University, Wenzhou 325035, China;
    3. Siberian State Industrial University Novokuznetsk, 654007, Russia;
    4. Institute of High Current Electronics of the Siberian Branch of the Russia Academy of Sciences, Tomsk 634055, Russia
  • 收稿日期:2017-08-10 修回日期:2017-08-23 出版日期:2017-12-05 发布日期:2017-12-05
  • 通讯作者: Xi-Zhang Chen E-mail:chenxizhang@wzu.edu.cn
  • 基金资助:
    Project supported by the Ministry of Education and Science of Russian Federation (State Task No. 3.1283.2017/4.6).

Variations in defect substructure and fracture surface of commercially pure aluminum under creep in weak magnetic field

Sergey Konovalov1,2, Dmitry Zagulyaev3, Xi-Zhang Chen(陈希章)1,2, Victor Gromov3, Yurii Ivanov4   

  1. 1. Samara National Research University, Samara 443086, Russia;
    2. Wenzhou University, Wenzhou 325035, China;
    3. Siberian State Industrial University Novokuznetsk, 654007, Russia;
    4. Institute of High Current Electronics of the Siberian Branch of the Russia Academy of Sciences, Tomsk 634055, Russia
  • Received:2017-08-10 Revised:2017-08-23 Online:2017-12-05 Published:2017-12-05
  • Contact: Xi-Zhang Chen E-mail:chenxizhang@wzu.edu.cn
  • Supported by:
    Project supported by the Ministry of Education and Science of Russian Federation (State Task No. 3.1283.2017/4.6).

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摘要： Commercially pure polycrystalline aluminum of grade A85, as a test material, is investigated. Using scanning and transmission electron microscopy the aluminum fine structure and fracture surface are analyzed. Fractures are studied in the regime of creep with and without a simultaneous effect of 0.3-T magnetic field. It is found that the application of a magnetic field in a linear stage of creep leads to substructure imperfection increasing. Furthermore, the magnetic field effect on aluminum in the process of creep causes the average scalar density of dislocations to increase and induces the process of dislocation loop formation to strengthen. Fractographic investigation of the fracture surface shows that in the fibrous fracture zone the average size of plastic fracture pits decreases more than twice under creep in the condition of external magnetic field compared with in the conventional experimental condition. In a shear zone, the magnetic field causes the average size of fracture pits to decrease. Experimental data obtained in the research allow us to conclude that the magnetic field effect on aluminum in the process of creep leads to the fracture toughness value of the material decreasing, which will affect the state of defect substructure of the volume and surface layer of the material. The influence of the magnetic field is analyzed on the basis of the magneto-plasticity effect.

关键词: aluminum, magnetic field, creep, structure

Abstract: Commercially pure polycrystalline aluminum of grade A85, as a test material, is investigated. Using scanning and transmission electron microscopy the aluminum fine structure and fracture surface are analyzed. Fractures are studied in the regime of creep with and without a simultaneous effect of 0.3-T magnetic field. It is found that the application of a magnetic field in a linear stage of creep leads to substructure imperfection increasing. Furthermore, the magnetic field effect on aluminum in the process of creep causes the average scalar density of dislocations to increase and induces the process of dislocation loop formation to strengthen. Fractographic investigation of the fracture surface shows that in the fibrous fracture zone the average size of plastic fracture pits decreases more than twice under creep in the condition of external magnetic field compared with in the conventional experimental condition. In a shear zone, the magnetic field causes the average size of fracture pits to decrease. Experimental data obtained in the research allow us to conclude that the magnetic field effect on aluminum in the process of creep leads to the fracture toughness value of the material decreasing, which will affect the state of defect substructure of the volume and surface layer of the material. The influence of the magnetic field is analyzed on the basis of the magneto-plasticity effect.

Key words: aluminum, magnetic field, creep, structure

中图分类号:  (Creep)

  • 62.20.Hg
61.72.Lk (Linear defects: dislocations, disclinations) 41.20.-q (Applied classical electromagnetism) 68.37.Hk (Scanning electron microscopy (SEM) (including EBIC))