摘要
1473K，30MPa，1h的热压条件下烧结了Ti／Ti+TiAl／TiAl粉体叠层材料，在烧结过程中，混合层Ti＋TiAl内部发生了剧烈的化学反应（Ti＋TiAl→AlTi2），该反应波及到相邻的Ti层及TiAl层，因而形成了物相组成渐变的精细梯度结构：Ti／Ti＋AlTi2／AlTi2／AlTi2＋TiAl／TiAl．使用A176Si10Zn10Cu4质量分数，％）合金钎料在853K，20min的钎焊条件下将该材料的TiAl例与Al进行了连接界面的测试表明，钎焊过程中钎料中的元素Si向TiAl表面扩散，并有Ti-Si化合物生成对反应机理进行了探讨．最终获得的Ti／TiAl／Al系密度梯度材料不仅整体致密。
Fabrication of light functionally graded material with a density gradient was studied.Af first,the laminated powder compact of Ti/Ti+TiAl/TiAl was sintered at 1473 K under a pressure of 30 Mpa for 1 h.It was found that,during sintering,violent reaction of Ti+TiAlAlTi2occurred within not only the mixed layer of Ti+TiAl,but also the adjacent Ti layer and TiAl layer,As a result,finer graded microstructures than designed Ti/Ti_AlTi2/AlTi2+TiAl/TiAl,are formed within the sintered body.Secong,the TiAl side of the above sintered body was joined to metal Al at 853 K for20 min by using Al76Si10Zm10Cu4(mass fraction,%)alloy as brazing filler.The analyzed results show that during the brazing process the element Si in the brazing alloy diffused to the surface of TiAl,and the Ti_Si compound was produced at the interface.The corresponding chemical reaction mechanism was discussed.Finally,the wholly dense Ti/TiAl/Al system FGM is obatined,and its density changes quasi-continuously in its thickness direction.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
1999年第10期1053-1056,共4页
Acta Metallurgica Sinica
基金
国家自然科学基金!59771028
