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

Shuwei LIU,Xiaofeng HU,Haichang JIANG,Xiuyan LI and Lijian RONG Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China

摘 要：The internal friction（IF） of Mg-0.6%Zr alloy is measured in the present study and two IF peaks of（P 1（97 C,1 Hz） and P 2（230 C,1Hz） ） are found,respectively.It is shown that the novel P 1 peak is frequency independent and the peak temperature increased with the increase of strain amplitude or heating rate.P 1 peak could be repressed by the reheating-up measurements and represented by heat treatment.The mechanism of P 1 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 P 2 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.

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