Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第9卷    第1期    总第30期    1999年3月

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文章编号:1004-0609(1999)01-0091-06
喷射共沉积SiCp增强6061Al MMC的阻尼特性及位错阻尼机制
张迎元   乐永康   高灵清

(CSSC第七二五研究所, 洛阳 471039)

摘 要: 采用喷射共沉积方法制备了6061Al/SiCp MMC, 并对其阻尼机制进行了研究。 发现在试验测量范围内Q-1ft 敏感, 对Am没有依从性, mt 变化只表现为线性下降, 无明显软化现象, 且6061Al/SiCp MMC的阻尼能力比6061Al至少高一个数量级。6061Al/SiCp 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。

 

关键字: 位错   阻尼机制   MMC   喷射沉积

DAMPING CHARACTERISTIC AND DISLOCATION-INDUCED
DAMPING MECHANISM OF SPRAY-ATOMIZED AND
CODEPOSITED 6061Al/SiCp MMC
Zhang Yingyuan, Le Yongkang and Gao Lingqing

Luo Yang Ship Materials Research Institute, Luoyang 471039, P. R. China

Abstract:In order to obtain a high damping capacity aluminum matrix composites, 6061Al/SiCp 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 Am; and m decreases linearly with  t increasing and is not obviously soft during the experimental testing range. The damping capacity of 6061Al/SiCp MMC  is ten times higher than that of 6061Al. The dislocation-induced damping is the main mechanism of 6061Al/SiCp 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.

 

Key words:    dislocation   damping mechanism   MMC   spray-deposition

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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