论文部分内容阅读
在高阻尼镁合金研究中,发现了与合金室温下高阻尼性能有关的宽弛豫内耗峰,该峰为位错内耗峰;弛豫内耗峰是基面位错在热激活作用下运动与点缺陷(空位与溶质原子)相互作用产生的。同时在高阻尼合金Mg-Ni和Mg-0.6%Zr中发现了晶界内耗峰。有必要指出的是合金的显微组织会影响晶界弛豫:随着Ni质量分数增加,晶粒细化同时晶界内耗峰向低温处迁移;同Mg-0.6%Zr合金相比,加入少量的Y后,Mg-0.6%Zr-Y合金晶界弛豫峰向高温处推进。
In the research of high damping magnesium alloy, the wide relaxation internal friction peak associated with the high damping property of the alloy at room temperature was found, which is the dislocation internal friction peak. The relaxation internal friction peak is the result of the movement of the basal plane dislocation under thermal activation Defects (vacancies and solute atoms) generated by the interaction. At the same time, the peak in the grain boundary is found in the high-damping alloys Mg-Ni and Mg-0.6% Zr. It is necessary to point out that the microstructure of the alloy will affect the grain boundary relaxation: With the increase of the mass fraction of Ni, the grain refinement and the dissipation of the peak in the grain boundary move to low temperature. Compared with Mg-0.6% Zr alloy, Y, the grain boundary relaxation peak of Mg-0.6% Zr-Y alloy advanced to high temperature.