TY - JOUR
T1 - A novel strategy to break through the strength-ductility trade-off of titanium matrix composites
AU - Wang, Qiang
AU - Zhang, Zhao Hui
AU - Liu, Luo Jin
AU - Jia, Xiao Tong
AU - He, Yang Yu
AU - Zhou, Jin Zhao
AU - Sun, Yuan Hao
AU - Cheng, Xing Wang
N1 - Publisher Copyright:
© 2024
PY - 2024/11
Y1 - 2024/11
N2 - This study used a solution blending method to coat Ti64 alloy particles with an organopolysilazane (OPSZ) precursor, creating (TiC + Ti3Si)/Ti64 composites via spark plasma sintering (SPS). During SPS, OPSZ decomposes, releasing silicon, carbon, and nitrogen. Nitrogen exits as NH3 and N2, while carbon and silicon partially dissolve in the matrix and partially react with titanium to form TiC and Ti3Si particles. The composite with 0.5 wt% OPSZ exhibited a tensile strength of 1135 MPa and an elongation of 19.0 %, 18.2 % and 28.5 % higher than commercial Ti64 alloy, respectively. The strength increase is attributed to grain refinement, solid solution strengthening, Orowan strengthening, and L phase strengthening. The improved ductility results from fine precipitates promoting dislocation multiplication, the dislocation storage effect of the interface L-phase, and matrix purification by H2 and NH3 from OPSZ decomposition.
AB - This study used a solution blending method to coat Ti64 alloy particles with an organopolysilazane (OPSZ) precursor, creating (TiC + Ti3Si)/Ti64 composites via spark plasma sintering (SPS). During SPS, OPSZ decomposes, releasing silicon, carbon, and nitrogen. Nitrogen exits as NH3 and N2, while carbon and silicon partially dissolve in the matrix and partially react with titanium to form TiC and Ti3Si particles. The composite with 0.5 wt% OPSZ exhibited a tensile strength of 1135 MPa and an elongation of 19.0 %, 18.2 % and 28.5 % higher than commercial Ti64 alloy, respectively. The strength increase is attributed to grain refinement, solid solution strengthening, Orowan strengthening, and L phase strengthening. The improved ductility results from fine precipitates promoting dislocation multiplication, the dislocation storage effect of the interface L-phase, and matrix purification by H2 and NH3 from OPSZ decomposition.
KW - Mechanical properties
KW - Microstructure
KW - Spark plasma sintering
KW - Titanium matrix composites
UR - http://www.scopus.com/inward/record.url?scp=85201067115&partnerID=8YFLogxK
U2 - 10.1016/j.compositesa.2024.108407
DO - 10.1016/j.compositesa.2024.108407
M3 - Article
AN - SCOPUS:85201067115
SN - 1359-835X
VL - 186
JO - Composites Part A: Applied Science and Manufacturing
JF - Composites Part A: Applied Science and Manufacturing
M1 - 108407
ER -