(CSSC第七二五研究所， 洛陽(yáng) 471039)
摘 要: 采用噴射共沉積方法制備了6061Al/SiCp MMC， 并對(duì)其阻尼機(jī)制進(jìn)行了研究。 發(fā)現(xiàn)在試驗(yàn)測(cè)量范圍內(nèi)Q-1對(duì)f 和t 敏感， 對(duì)Am沒(méi)有依從性， m 隨t 變化只表現(xiàn)為線(xiàn)性下降， 無(wú)明顯軟化現(xiàn)象， 且6061Al/SiCp MMC的阻尼能力比6061Al至少高一個(gè)數(shù)量級(jí)。6061Al/SiCp MMC在試驗(yàn)測(cè)量溫度范圍內(nèi)， 位錯(cuò)阻尼起主要作用。 在低應(yīng)變條件下， 隨溫度的升高， 由于熱激活作用， 位錯(cuò)阻尼在不同的溫度段表現(xiàn)出不同的作用機(jī)制， 可描述為： 位錯(cuò)弓出→溶質(zhì)原子和氣團(tuán)協(xié)同位錯(cuò)運(yùn)動(dòng)→位錯(cuò)從溶質(zhì)原子脫釘并拖曳氣團(tuán)運(yùn)動(dòng)→長(zhǎng)位錯(cuò)擺脫氣團(tuán)在強(qiáng)釘扎下運(yùn)動(dòng)→位錯(cuò)脫釘。
關(guān)鍵字: 位錯(cuò) 阻尼機(jī)制 MMC 噴射沉積
DAMPING MECHANISM OF SPRAY-ATOMIZED AND
CODEPOSITED 6061Al/SiCp MMC
（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
