喷射共沉积SiC_p增强6061Al MMC的阻尼特性及位错阻尼机制

来源期刊：中国有色金属学报1999年第1期

论文作者：张迎元 乐永康 高灵清

文章页码：91 - 96

关键词：位错，阻尼机制，MMC，喷射沉积

Key words：dislocation, damping mechanism, MMC, spray-deposition

摘    要：采用喷射共沉积方法制备了6061Al/SiC_p MMC， 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A_m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/SiC_p MMC的阻尼能力比6061Al至少高一个数量级。6061Al/SiC_p MMC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。

Abstract: In order to obtain a high damping capacity aluminum matrix composites, 6061Al/SiC_p MMC was fabricated by spray-atomization and codeposition, and the damping mechanism of the material was studied. The results show that the damping capacity Q^-1 is sensitive to f and t, but is not related with A_m; and m decreases linearly with t increasing and is not obviously soft during the experimental testing range. The damping capacity of 6061Al/SiC_p MMC is ten times higher than that of 6061Al. The dislocation-induced damping is the main mechanism of 6061Al/SiC_p MMC . Under low strain with increasing temperature, for thermal activation the dislocation-induced damping shows various effecting mechanism, which can be described as follows: pinned dislocation line bowes out→the motion of dislocation line is followed by the solution atoms and interstitial atom atmosphere→the motion of dislocation line breaks out from the solution atoms and drags the atmosphere→the motion of long dislocation breaks from the atmosphere and is pinned by some powerful pinning points→the pinned dislocation line breaks away.