多步热处理对Ti_2AlC/TiAl复合材料组织与性能的影响  

Effects of Multistep Heat Treatment on Microstructures and Mechanical Properties of the Ti_2AlC/TiAl Composites

作　　者：岳云龙[1] 王志杰[1] 吴海涛[1] 苏通[1] 徐言超[1] 

机构地区：[1]济南大学,山东济南250022

出　　处：《稀有金属材料与工程》2006年第4期600-604,共5页Rare Metal Materials and Engineering

基　　金：山东省自然科学基金重点项目资助(Z2003F02)

摘　　要：利用放电等离子烧结(SPS)技术,原位制备了Ti2AlC/TiAl复合材料,研究了多步热处理对Ti2AlC/TiAl显微组织与力学性能的影响。结果表明,通过多步热处理,Ti2AlC/TiAl的力学性能得到明显改善。其中在1390℃热处理时,弯曲强度达到957.9MPa,断裂韧性达到20.73MPa·m1/2。通过多步热处理,可以得到双态组织和晶粒更为细小均匀的近γ组织的TiAl基体,复合材料的断裂模式转变为穿晶解理断裂。在热处理过程中,Ti2AlC能够显著抑制TiAl基体中γ晶粒和α2/γ层片晶团的长大,并且在一定程度上,阻碍α2/γ层片晶团的形成。In this paper Ti2AkC/TiAl composites was prepared in-situ using spark plasma sintering (SPS) technology and the effects of multistep heat treatment on microstructures and mechanical properties of the composites were studied. The experimental results show that mechanical properties of Ti2AlC/TiAl composite are improved obviously after multistep heat treatment. Its bending strength and fracture toughness reach to.957.9 MPa and 20.73 MPa center dot m(1/2) respectively after heat treatment of 1390 degrees C. And the TiAl matrix has a duplex microstructure, and the fracture mode is transgranular cleavage fracture. It is found that the Ti2AlC effectively inhibits the y phase grains and the alpha(2)/gamma lamellar colony microstructure from growing up, and prevents the alpha(2)/gamma lamellar colony microstructure from forming to a certain extent.

关 键 词：TI2ALC/TIAL复合材料 多步热处理 显微组织 力学性能 

分 类 号：TB331[一般工业技术—材料科学与工程]