高阻尼铝合金层压板的内耗

来源期刊：中国有色金属学报1996年第3期

论文作者：罗兵辉 周善初 张迎元 朱劲松

文章页码：134 - 137

关键词：层 层压板 内耗 频率 温度

Key words：laminate　internal friction　frequency　temperature

摘    要：高阻尼铝合金层压板为五层铝合金的复合结构，中心为中等强度的4号防锈铝LF4(5083) ，两边对称地包覆高阻尼的Zn-22% Al(质量分数)共析合金，最外层包覆铝LB1(7072)作为保护层。通过测试层压板及其组成各单层在应变振幅Aε= 5 x 10-5下内耗随温度和频率的变化，得出层压板各层界面对内耗有一定贡献。在低温低应变振幅下，经淬火后的层压板内耗比淬火后在250℃进行断而加工率为60%变形后的层压板内耗高。从TEM照片分析，淬火后在250℃变形的层压板中锌铝合金的晶粒内含有大量位错，同时晶粒粗化，表明Zn-22%Al共析合金的高阻尼主要是由其晶粒界面粘滞滑动引起的，位错引起的弛豫作用小。,

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.