基于韧脆复合结构的Ti-Al-Ti-Ti2AlNb层状复合材料的组织与力学性能  

Microstructure and Mechanical Properties of Ti-Al-Ti-Ti2AlNb Laminated Composites Based on the Ductile-brittle Structure

作　　者：韩宝帅 万雄 徐严谨 侯红亮 荆涛[2] 马晓光 裴葆青[3] Han Baoshuai;Wan Xiong;Xu Yanjin;Hou Hongliang;Jing Tao;Ma Xiaoguang;Pei Baoqing(AVIC Manufacturing Technology Institute,Beijing 100024,China;Tsinghua University,Beijing 100084,China;Beihang University,Beijing 100083,China)

机构地区：[1]中国航空制造技术研究院,北京100024 [2]清华大学,北京100084 [3]北京航空航天大学,北京100083

出　　处：《稀有金属材料与工程》2020年第6期2083-2088,共6页Rare Metal Materials and Engineering

基　　金：国防基础科研计划(JCKY2017205B032);国防科技创新特区项目。

摘　　要：受生物材料的韧/脆复合结构的启发,将Al箔、Ti箔和Ti2AlNb箔材堆叠排列,采用真空热压烧结技术制备了层级结构的Ti-Al-Ti-Ti2AlNb层状复合材料。利用SEM、XRD等技术表征了材料的微观结构,并测试了抗弯与抗压性能。研究发现,设计的层状结构复合了Ti、TiAl系列金属间化合物、Ti2AlNb等多种材料,层级结构明显,界面清晰。抗弯强度与抗压强度分别为1231±71MPa和1341±63MPa,相比同类材料具有显著的优势。分析认为,多层级结构的存在对裂纹的扩展有显著的阻碍作用;相比常规的二元TiAl层状材料,Ti2AlNb层的存在显著提高了力学性能。Based on the ductile-brittle composite principle of biomaterials,Al foils,Ti foils and Ti2AlNb foils were stacked in a certain order,and Ti-Al-Ti-Ti2AlNb laminated composites were prepared by vacuum hot pressing sintering.The microstructure was analyzed by SEM and XRD,and the flexural and compressive properties were also analyzed.Results show that the laminated composites are composed of Ti,a series of TiAl intermetallic compounds and Ti2AlNb combined with obvious hierarchical structure and clear interface.The flexural strength and compressive strength are 1231±71 MPa and 1341±63 MPa,respectively,which have significant advantages over similar materials.The analysis shows that the existence of laminated structures plays an important role in preventing expansion of crack.Compared with the conventional binary TiAl layered materials,the existence of Ti2AlNb layers significantly improves the mechanical properties of the materials.

关 键 词：层级结构 界面反应 原位弯曲 抗压性能 强化机理 

分 类 号：TB331[一般工业技术—材料科学与工程]