反应合成层状多孔TiAl复合板材的组织演变  

Microstructure of Layered Porous TiAl Composite Sheet Synthesized by Reacted Sintering

作　　者：李学问[1] 刘刚 索转霞 魏博鑫 房文斌[1] LI Xue-wen;LIU Gang;SUO Zhuan-xia;WEI Bo-xin;FANG Wen-bin(School of Material Science and Engineering,Harbin University of Science and Technology,Harbin 150040,China)

机构地区：[1]哈尔滨理工大学材料科学与工程学院

出　　处：《哈尔滨理工大学学报》2019年第5期34-38,共5页Journal of Harbin University of Science and Technology

基　　金：国家自然科学基金(51704088);黑龙江省本科高校青年创新人才培养计划(UNPYSCT-2017084);亚稳材料制备技术与科学国家重点实验室开放课题(201805)

摘　　要：以纯Ti箔、纯Al粉、纯Nb粉为原材料,首先采用粉末冶金工艺制备Al-Nb复合箔材,再采用箔箔冶金工艺制备层状多孔TiAl合金板材。研究结果表明:真空热压后,Ti/Al-Nb复合板材无新相生成,Ti箔与Al-Nb复合箔材结合方式为机械结合,板材厚度均匀。分步热处理后的薄板由Al 3Nb、TiAl 3、TiAl 2、TiAl、AlNb 2和Ti 3Al六种相层组成,其中TiAl相层厚度约为100μm,Ti 3Al相层厚度约为12μm,(Ti,Nb)Al 3相层厚度约为80μm,TiAl 2相层厚度约为2μm。AlNb 2分布于(Ti,Nb)Al 3相层中,并在(Ti,Nb)Al 3相层中形成了不规则分布的孔洞。In this paper,pure Ti foil,pure Al powder and pure Nb powder are used as raw materials.Firstly,Al-Nb composite foil was prepared by powder metallurgy process,and then layered porous TiAl alloy sheet is prepared by foil metallurgy.The results show that after vacuum hot pressing,there is no new phase in the Ti/Al-Nb composite sheet,and the combination of Ti foil and Al-Nb composite foil is mechanically combined,and the thickness of the sheet is uniform.The thin plate after step heat treatment is composed of six phase layers of Al3Nb,TiAl3,TiAl2,TiAl,AlNb2 and Ti3Al,wherein the TiAl phase layer has a thickness of about 100μm,the Ti 3Al phase layer has a thickness of about 12μm,and the(Ti,Nb)Al3 phase layer thickness.It is about 80μm and the thickness of the TiAl2 phase layer is about 2μm.AlNb 2 is distributed in the(Ti,Nb)Al3 phase layer,and irregularly distributed pores are formed in the(Ti,Nb)Al3 phase layer.

关 键 词：TIAL合金 粉末冶金 堆叠烧结 多孔材料 

分 类 号：TB331[一般工业技术—材料科学与工程]