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采用喷射共沉积方法制备了6061Al/SiCpMMC,并对其阻尼机制进行了研究。发现在试验测量范围内Q-1对f和t敏感,对Am没有依从性,M随t变化只表现为线性下降,无明显软化现象,且6061Al/SiCpMMC的阻尼能力比6061Al至少高一个数量级。6061Al/SiCpMMC在试验测量温度范围内,位错阻尼起主要作用。在低应变条件下,随温度的升高,由于热激活作用,位错阻尼在不同的温度段表现出不同的作用机制,可描述为:位错弓出→溶质原子和气团协同位错运动→位错从溶质原子脱钉并拖曳气团运动→长位错摆脱气团在强钉扎下运动→位错脱钉。
6061Al / SiCpMMC was prepared by spray co-deposition method and its damping mechanism was studied. It is found that Q-1 is sensitive to f and t within the experimental measurement range, has no compliance with Am, M shows only a linear decrease with t, and has no obvious softening phenomenon. The damping capacity of 6061Al / SiCpMMC is at least an order of magnitude higher than that of 6061Al. Dislocation damping plays a major role in the experimental temperature range of 6061Al / SiCpMMC. Under low strain conditions, with the increase of temperature, the dislocation damping shows different mechanism at different temperature due to thermal activation. It can be described as: dislocation bow → solute atom and air mass co-dislocation → Dislocations from the solute atom and remove the nail towed air movement → long dislocation to get rid of air mass movement in the strong pin → dislocation of the nail.