论文部分内容阅读
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.
The internal friction (IF) of Mg-0.6% Zr alloy is measured in the present study and two IF peaks of (P1 (97 C, 1 Hz) and P2 (230 C, 1 Hz) 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. 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.