Acta Metallurgica Sinica (English Letters) ›› 2011, Vol. 24 ›› Issue (5): 335-342.DOI: 10.11890/1006-7191-115-335

• 研究论文 •    下一篇

Internal friction peak associated with dislocations in Mg-Zr magnesium alloy

Shuwei Liu1,胡小锋2,姜海昌2,li xiuyan3,戎利建2   

  1. 1. 中科院金属研究所
    2. 中国科学院金属研究所
    3. Institute of Metal Research, CAS
  • 收稿日期:2011-01-05 修回日期:2011-03-29 出版日期:2011-10-25 发布日期:2011-10-18
  • 通讯作者: Shuwei Liu

Internal friction peak associated with dislocations in Mg-0.6%Zr alloy

Shuwei LIU, Xiaofeng HU, Haichang JIANG, Xiuyan LI, Lijian RONG   

  1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
  • Received:2011-01-05 Revised:2011-03-29 Online:2011-10-25 Published:2011-10-18
  • Contact: Shuwei LIU

PDF (PC)

895

Abstract: The internal friction (IF) of Mg-0.6%Zr alloy is measured in the present study and two IF peaks of (P1 (97℃, 1 Hz) and P2 (230 ℃, 1 Hz)) are found, respectively. It is shown that the novel P1 peak is frequency independent and the peak temperature increased with the increase of strain amplitude or heating rate. P1 peak could be repressed by the reheating-up measurements and represented by heat treatment. The mechanism of P1 peak is clarified by optical microscope (OM) and transmission electron microscope (TEM) observation, and considered to be caused by the creation and expansion of dislocations during plastic deformation. The P2 peak is a thermally activated relaxation IF peak, and activation energy is 1.46~eV, which is caused by the relaxation of the grain boundaries in Mg-0.6%Zr alloy.

Key words: Internal friction, Dislocation, Plastic deformation, Grain boundaries relaxation