Controllable two-scale network architecture and enhanced mechanical properties of (Ti5Si3+TiBw)/Ti6Al4V composites.
Novel Ti6Al4V alloy matrix composites with a controllable two-scale network architecture were successfully fabricated by reaction hot pressing (RHP). TiB whiskers (TiBw) were in-situ synthesized around the Ti6Al4V matrix particles, and formed the first-scale network structure (FSNS). Ti5Si3 needles (Ti5Si3) precipitated in the β phase around the equiaxed α phase, and formed the secondary-scale network structure (SSNS). This resulted in increased deformation compatibility accompanied with enhanced mechanical properties. Apart from the reinforcement distribution and the volume fraction, the ratio between Ti5Si3 and TiBw fraction were controlled. The prepared (Ti5Si3 + TiBw)/Ti6Al4V composites showed higher tensile strength and ductility than the composites with a one-scale microstructure, and superior wear resistance over the Ti6Al4V alloy under dry sliding wear conditions at room temperature.
School of Materials Science and Engineering, Harbin Institute of Technology, P.O. Box 433, Harbin 150001, P. R. China.
Y
Y
Jiao
School of Materials Science and Engineering, Harbin Institute of Technology, P.O. Box 433, Harbin 150001, P. R. China.|State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, P.O. Box 433, Harbin 150001, P. R. China.
L J
LJ
Huang
School of Materials Science and Engineering, Harbin Institute of Technology, P.O. Box 433, Harbin 150001, P. R. China.
T B
TB
Duan
School of Materials Science and Engineering, Harbin Institute of Technology, P.O. Box 433, Harbin 150001, P. R. China.
S L
SL
Wei
School of Materials Science and Engineering, Harbin Institute of Technology, P.O. Box 433, Harbin 150001, P. R. China.
B
B
Kaveendran
School of Materials Science and Engineering, Harbin Institute of Technology, P.O. Box 433, Harbin 150001, P. R. China.|State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, P.O. Box 433, Harbin 150001, P. R. China.
L
L
Geng