Improving flexural strength of Ti_(2)C-Ti cermet by hot compressive deformation:Microstructure evolution and fracture behaviors  

作　　者：SUN FengBo WANG Shuai CHEN Xin ZHANG Rui AN Qi LIU WenQi HUANG LuJun GENG Lin 

机构地区：[1]School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150001,China [2]Waikato Centre for Advanced Materials and Manufacturing,School of Engineering,University of Waikato,Hamilton 3240,New Zealand [3]State Key Laboratory of Advanced Welding and Joining,Harbin Institute of Technology,Harbin 150001,China

出　　处：《Science China(Technological Sciences)》2023年第11期3298-3308,共11页中国科学（技术科学英文版）

基　　金：supported by the National Key R&D Program of China(Grant No.2021YFB3701203);the National Natural Science Foundation of China(Grant Nos.52171137,52071116,52192593);the Heilongjiang Provincial Natural Science Foundation of China(Grant No.TD2020E001);the Heilongjiang Touyan Team Program;China Postdoctoral Science Foundation(Grant No.2022M710939)。

摘　　要：In order to improve the microstructure and mechanical properties,the hot compressive deformation with 50%height reduction at 1100℃was conducted on a Ti_(2)C-Ti cermet.The results showed that the lamellar Ti precipitates in Ti_(2)C grains were transformed to bimodal size distribution,which was approximately 290 nm and 5.8μm in diameter,respectively,after the hot deformation.The bimodal Ti precipitates suppressed{011}cleavage surfaces of Ti_(2)C during flexural fracture,which resulted in an 18.5%increment of strength.This phenomenon can be attributed to the bimodal Ti precipitates that decreased the average crack driving force due to their gentle variation in elastic modulus compared with the monolithic lamellar Ti precipitates.The present work can guide further deformation and mechanical property improvement of Ti_(2)C cermets.

关 键 词：CERMET sub-stoichiometric titanium carbide hot deformation PRECIPITATE fracture behavior 

分 类 号：TG148[一般工业技术—材料科学与工程]