| 【文章摘要】 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. |