摘要
采用真空感应熔炼和铸造,通过原位自生方式制备体积分数分别为2.5%、5%和10%的TiC增强TC4复合材料,对复合材料相、组织及在室温和高温时的拉伸特性和强化机理进行研究。结果表明:TiC含量较少时,复合材料中的TiC增强相为细条状或小粒状共晶TiC;当TiC体积分数达到10%时,TiC增强相以等轴或枝晶状的初生TiC为主;复合材料室温和高温强度比未复合基体合金有显著提高,但延伸率有所下降;复合材料室温时以C元素固溶强化机制为主,不同TiC含量的复合材料之间强度差别不大,高温时颗粒的载荷传递效应开始起作用,拉伸强度随TiC含量增加而增大。
TiC/TC4 composites containing 2.5%,5%and 10%volume fractions of TiC were produced by induction skull melting and common casting utilizing in-situ reaction between titanium and carbon.The phase composition and microstructure were analyzed by X-ray diffraction and optical microscopy.Tensile properties of the composites at room and elevated temperature were investigated and the strengthening mechanisms were discussed.Barlike or small granular eutectic TiC particles are found within the composites when volume fraction of TiC is small,whereas the equiaxed or dendritic primary TiC particles are found to be the main reinforcements when volume fraction of TiC is up to 10%.The tensile strengths of composites at room and elevated temperature are promoted obviously compared with the unreinforced matrix alloy.However,the elongations of composites are comparatively lower.It is found that there is no obvious increase in tensile strength with volume fraction of TiC increasing,thus the carbon in solid solution makes a maximum contribution to the strength increase of composites.The elevated temperature strengths of composites increase with volume fraction of TiC increasing,which shows that the load transferring effect of matrix to TiC particles also makes a contribution at high temperature.
作者
曹磊
曲文诚
胡郅贤
魏尊杰
王宏伟
CAO Lei;QU Wencheng;HU Zhixian;WEI Zunjie;WANG Hongwei(Shenyang Ligong University,Shenyang 110159,China;School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China)
出处
《沈阳理工大学学报》
CAS
2021年第3期46-51,共6页
Journal of Shenyang Ligong University
基金
辽宁省教育厅高等学校基本科研项目(面上青年人才项目)(LG202115)。
关键词
钛基复合材料
TIC颗粒
微观组织
拉伸性能
titanium matrix composites
TiC particles
microstructure
tensile properties
