摘要
兼具优良吸能特性和高阻尼性能的金属基复合材料有着广泛的应用需求。采用“均混-压制-脱溶-烧结”的四阶段粉末冶金技术制备三维通孔的TiNi多孔材料,并以TiNi多孔材料为基体,基于真空负压渗流技术制备新型Acrylic/TiNi复合材料。内耗测试表明:新型复合材料阻尼能力远高于相应的多孔材料,尤其在室温附近。分析表明,复合材料阻尼能力的提高除与Acrylic的本征高阻尼有关,还与复合材料的多孔TiNi基体和Acrylic之间新增的大量界面阻尼有关。准静态压缩力学性能测试表明:Acrylic/TiNi复合材料可实现和TiNi多孔合金相近的能量吸收效率,这源于复合材料更长且更光滑的压缩平台区。此外,增强相Acrylic的充分渗入,极大提高复合材料的能量吸收能力和屈服强度。压缩形变机制分析表明,复合材料吸能特性的综合提高与压缩过程中TiNi多孔基体和Acrylic填充物之间相互补偿和耦合有关。
Metal-matrix composites with high damping capacity and excellent energy absorption properties have extensive application requirements.Porous TiNi shape memory alloys with a three-dimensional connected structure were firstly prepared by powder metallurgy technology consisting of“uniform-mixing,compaction,dissolution and sintering”four stages.Then,the novel Acrylic/TiNi composites were manufactured in light of vacuum negative pressure infiltration technology.The damping properties were characterized by internal friction.It was found that Acrylic/TiNi composites exhibit a much higher damping capacity than that of corresponding TiNi porous materials,especially in around room temperature zone.It was rationalized that the great improvement of the damping capacity is originated from the intrinsic high-damping of Acrylic phase as well as induced massive interface damping between TiNi porous matrix and Acrylic phases.The quasi-static compressive mechanical measurement shows that Acrylic/TiNi composites can achieve energy absorption efficiency similar to that of TiNi porous alloy,the reason of which is confirmed to be associated with the longer and smoother compression plateau area of TiNi composites.In addition,the full penetration of the Acrylic reinforced phase greatly enhances the energy absorption capacity and yield strength of the composites.Deformation mechanism analysis of the TiNi composites indicates that the mutual compensation and coupling between porous matrix and Acrylic fillings during the compressive process can be considered to account for the improved energy absorption characteristics.
作者
郝刚领
张江
李育川
王幸福
雷波
王伟国
王新福
HAO Gangling;ZHANG Jiang;LI Yuchuan;WANG Xingfu;LEI Bo;WANG Weiguo;WANG Xinfu(College of Physics and Electronic Information,Yan’an University,Yan’an 716000,Shaanxi,China;Key Laboratory of Materials Physics,Institute of Solid State Physics,Chinese Academy of Science,Hefei 230031,China)
出处
《材料工程》
EI
CAS
CSCD
北大核心
2023年第2期106-115,共10页
Journal of Materials Engineering
基金
国家自然科学基金资助项目(52061038,51661032,51301150)
陕西省“特支计划”区域发展人才专项资助项目(2020-44)
陕西省青年科技新星资助项目(2013KJXX-11)
延安大学研究生教育创新计划资助项目(YCX2021061)。
