泡孔结构对原位生成TiB_(2)增强铝基泡沫材料阻尼性能的影响  

Effect of foam structure on the damping performance of aluminum foam reinforced by in-situ TiB_(2) particles

作　　者：郑兴璋 曹卓坤[1,2] 张志刚 Zheng Xingzhang;Cao Zhuokun;Zhang Zhigang(Northeastern University,Key Laboratory for Ecological Metallurgy of Multimetallic Mineral(Ministry of Education),Shenyang 110819,China;Northeastern University,School of Metallurgy,Shenyang 110819,China)

机构地区：[1]东北大学多金属共生矿生态化冶金教育部重点实验室,沈阳110819 [2]东北大学冶金学院,沈阳110819

出　　处：《材料与冶金学报》2021年第2期124-129,共6页Journal of Materials and Metallurgy

基　　金：国防科工局基础科研项目(JCKY2018110C051);中央高校基本科研业务专项资金资助项目(N2125015)。

摘　　要：以原位生成TiB_(2)颗粒增强铝合金为基体,在不同正压压力条件下通过熔体发泡法制备不同泡孔结构特征的Al-TiB_(2)复合泡沫,借助CT,SEM等手段重点研究了泡孔结构对Al-TiB_(2)复合泡沫阻尼性能的影响和阻尼机制.研究结果表明,随着外加压力的增大,Al-TiB_(2)复合泡沫材料的孔隙率逐渐减小,材料的屈服强度和杨氏模量逐渐增大,损耗因子逐渐降低.在试验温度范围内,Al-TiB_(2)复合泡沫材料的损耗因子比具有相似孔隙率的纯铝泡沫提高了35%~80%.原位生成的TiB_(2)颗粒能与铝基体形成大量的Al-TiB_(2)相界面,孔隙率的增大能够提高复合泡沫的比表面积;大量的相界面和较高的比表面积均能提升振动过程中Al-TiB_(2)复合泡沫的内耗源,从而提高泡沫材料的阻尼性能.The aluminum alloy reinforced by in-situ TiB_(2) particles was used as matrix,and the Al-TiB_(2) composite foams with different cell structure characteristics were fabricated by melt foaming under different positive pressure conditions.The influences of the cell structure on the damping properties of Al-TiB_(2) composite foam and the damping mechanism were studied by means of CT and SEM.The results show that with the increase of applied pressure,the porosity and loss factor of Al-TiB_(2) composite foam decrease,and the yield strength and Young’s modulus increase.In the test temperature range,the loss factor of Al-TiB_(2) composite foam increased by 35%~80%compared with that of pure aluminum foam with similar porosity.A large number of Al-TiB_(2) interfaces between with in-situ TiB_(2) particles and aluminum matrix were formed.The increase of porosity can enhance the specific surface of Al-TiB_(2) composite foam.The abundant formed interfaces and enhanced specific surface can both increase the internal friction source of Al-TiB_(2) composite foam during vibration,which improve the damping capacity of foams.

关 键 词：Al-TiB_(2)复合泡沫 泡孔结构 原位生成 阻尼 孔隙率 

分 类 号：TB34[一般工业技术—材料科学与工程]