新型超轻TiAl多孔材料的制备及其力学性能  

Preparation and Mechanical Property of Novel Ultralight TiAl Materials with High Porosity

作　　者：郝刚领[1,2] 王辉[2] 李先雨 王伟国[1] 

机构地区：[1]延安大学,陕西延安716000 [2]北京科技大学新金属材料国家重点实验室,北京100083

出　　处：《稀有金属材料与工程》2016年第9期2379-2384,共6页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51301150);新金属材料国家重点实验室开放基金(2012-Z01);陕西省青年科技新星人才专项(2013KJXX-11);陕西省高水平大学重点建设学科专项(2012SXTS05)

摘　　要：基于化学反应造孔和物理占位造孔的联合作用,发展了一种新型Ti Al金属间化合物多孔材料的制备工艺,具体可用均混、压制、脱溶、烧结4个阶段来描述。该工艺实现了毫/微米双孔结构Ti Al多孔材料的制备,其中微米孔由Kirkendall效应产生,毫米孔由物理占位造孔颗粒实现。材料具有完全的通孔结构,孔洞分布均匀,且孔隙率、孔径、孔型、孔结构可控,最高孔隙率可达90%。准静态压缩力学性能测试表明,Ti Al多孔材料属于脆性多孔材料,具有典型的脆性破坏断裂机制,其屈服强度与相对密度的关系可通过Gibson-Ashby正六面体单胞模型来解释。A novel preparation process was developed to fabricate Ti Al intermetallic compound porous materials based on the combination effect of making pores arising from the chemical reaction and physical space occupation. The technique mainly consisted of four stages including mixing, compacting, dissolution and sintering. The typical double pore structures of the Ti Al porous materials are achieved, in which the micron pore is associated with the Kirkendall effect and the millimeter pore comes from the space holders. The Ti Al porous materials exhibit a thorough open-cellular structure and a perfect homogeneous distribution. Moreover, the porosity, pore size, pore shape, and pore structure can be tailored as designed, and the maximal porosity even reaches 90%. The results of quasi-state compression tests indicate that the porous Ti Al is typical brittle porous materials with corresponding brittle fracture failure mechanism. The relationship between yield strength and relative density can be understood in terms of the cube cell model and it accords with Gibson-Ashby equation.

关 键 词：多孔材料 TI Al金属间化合物 制备 力学性能 

分 类 号：TF125.6[冶金工程—粉末冶金] TG146.23[冶金工程—冶金物理化学]