La_(2)O_(3)含量对(TiC+TiB)/IMI834复合材料组织及耐磨性的影响  

Effect of La_(2)O_(3) Content on Microstructures and Wear Resistance of IMI834 Matrix Composites

作　　者：郑博文 袁晓光[1] 董福宇[1] 左晓姣[1] 孙亮 黄宏军[1] ZHENG Bo-wen;YUAN Xiao-guang;DONG Fu-yu;ZUO Xiao-jiao;SUN Liang;HUANG Hong-jun(School of Materials Science and Engineering,Shenyang University of Technology,Shenyang 110870,Liaoning,China)

机构地区：[1]沈阳工业大学材料科学与工程学院,辽宁沈阳110870

出　　处：《铸造》2021年第8期933-938,共6页Foundry

基　　金：辽宁省教育厅基金(LQGD2019001)。

摘　　要：采用原位自生熔铸法制备了不同La_(2)O_(3)含量的钛基复合材料,研究了La_(2)O_(3)含量对钛基复合材料的显微组织、硬度及耐磨性的影响。结果表明:通过原位生成La_(2)O_(3)颗粒在钛合金基体中弥散分布,这些颗粒可以阻碍位错和晶界的运动。对复合材料有一定弥散强化作用;与未添加La_(2)O_(3)钛基复合材料相比,添加0.2vol.%La_(2)O_(3)后,(TiB+TiC)/IMI834钛基复合材料显微组织及性能达到最佳,洛氏硬度HRC从52.1增加到55.1。比磨损率从4.06×10^(-7)mm^(3)/N·mm减少到3.05×10^(-7)mm^(3)/N·mm,平均摩擦系数从0.30降低至0.24。磨损面仅存在较浅的犁沟,磨损机制为轻微的磨粒磨损。Titanium matrix composites with different amounts of La_(2)O_(3) were prepared by using in-situ casting method.The effects of La_(2)O_(3) content on the microstructure,hardness and wear resistance of(TiB+TiC)IMI834titanium matrix composites were studied.The results show that the in-situ produced La_(2)O_(3) particles aredispersed in the matrix;which hinders the movements of dislocation and grain boundary,with a role inthe strengthening of matrix;optimal microstructure and mechanical properties are obtained by adding 0.2 vol.%La_(2)O_(3) into the titanium matrix composite.The Rockwell hardness increased from HRC 52.1 to HRC 55.1,the specific wear volume decreased from 4.06×10^(-7)mm^(3) to 3.05×10^(-7)mm^(3),and the average friction coefficient decreased from 0.30 to 0.24.Only shallow furrows existed on the worn surface,and the wearmechanism was slight abrasive wear.

关 键 词：钛基复合材料 La_(2)O_(3) 微观组织 耐磨性 

分 类 号：TB33[一般工业技术—材料科学与工程]