Pinning Effect of In-Situ TiCp and TiBw on the Grain Size and Room Temperature Strength of (TiC + TiB)/Ti Composites

KONA Powder and Particle Journal

Biao Chen¹  Katsuyoshi Kondoh¹  Hisashi Imai¹  Lei Jia²  Shu-feng Li² 

[1] Joining and Welding Research Institute, Osaka University, Japan;School of Materials Science and Engineering, Xi`an University of Technology, China;

关键词: powder metallurgy;    ti matrix composites;    mechanical properties;    microstructure;    in situ reaction;   

DOI  :  10.14356/kona.2015020

来源: DOAJ

【 摘 要 】

(TiCp + TiBw)/Ti composite was firstly prepared by spark plasma sintering (SPS) and hot extrusion from Ti-B4C system, and then isothermally heat treated at 400–800 °C for 24 h to study the pinning effect of the in situ formed reinforcements. Microstructure and phase composition was investigated by SEM, XRD and TEM, variation of the grain size of Ti matrix was studied by EBSD analysis, and room temperature strength was also measured after different heat treatments. Results show that, comparing with pure Ti materials, both the grain size of Ti matrix and the room temperature strength of the composite almost keep stable after heat treatments, suggesting the pinning effect of in situ formed TiCp and TiBw is effective to suppress the growth of Ti matrix grains during heat treatments.

【 授权许可】

Unknown