(1.中南工業(yè)大學(xué)材料系，長(zhǎng)沙410083；
2.中船總公司七院第七二五研究所，洛陽(yáng)471039；
3.南京大學(xué)物理系，南京210093)
摘 要: 高阻尼鋁合金層壓板為五層鋁合金的復(fù)合結(jié)構(gòu)，中心為中等強(qiáng)度的4號(hào)防銹鋁LF4(5083) ，兩邊對(duì)稱地包覆高阻尼的Zn-22% Al(質(zhì)量分?jǐn)?shù))共析合金，最外層包覆鋁LB1(7072)作為保護(hù)層。通過(guò)測(cè)試層壓板及其組成各單層在應(yīng)變振幅Aε= 5 x 10-5下內(nèi)耗隨溫度和頻率的變化，得出層壓板各層界面對(duì)內(nèi)耗有一定貢獻(xiàn)。在低溫低應(yīng)變振幅下，經(jīng)淬火后的層壓板內(nèi)耗比淬火后在250℃進(jìn)行斷而加工率為60%變形后的層壓板內(nèi)耗高。從TEM照片分析，淬火后在250℃變形的層壓板中鋅鋁合金的晶粒內(nèi)含有大量位錯(cuò)，同時(shí)晶粒粗化，表明Zn-22%Al共析合金的高阻尼主要是由其晶粒界面粘滯滑動(dòng)引起的，位錯(cuò)引起的弛豫作用小。,
關(guān)鍵字: 層 層壓板 內(nèi)耗 頻率 溫度
LAMINATES WITH HIGH DAMPING
（1．Department of Materials Science and Engineering,
Central South University of Technology, Changsha 410083
2．China Ship Industry General Corporation, Luoyang471039
3.Department ofPhysics, University ofNanjing, Nanjing210093）
Abstract:A laminate consisting of five layers was fabricated; its central layer was 5083 (LF4) with high strength, and Zn-22%Al eutectoid alloy with high damping was coated symmetrically on both sides of the central layer and protection material was 7072 (LB1). By measuring the internal friction of the laminates and single materials under changeable temperature and frequency, it showed that the interfaces between the different layers may make a contribution to the internal friction. In low temperature and low strain amplitude, the internal friction of the laminates that have been rapidly cooled from 350℃is higher than that of the laminates with a reduction of area by 60% in 250℃after rapidly cooled from 350℃. From TEM picture, there are quantities of dislocations and the fine equiaxed grains ofαandβphases become coarse in Zn-22%Al alloy of the deformed laminates, showing that high damping of Zn-22%Al eutectoid alloy is chiefly due to the relaxation process of the interfaces, while that of the dislocations makes less contribution.
Key words: laminate internal friction frequency temperature
