TY - JOUR
T1 - Novel two-scale network structured (TiBw+Ti2Cu)/Ti6Al4V composites
T2 - Design, Microstructure, Mechanical properties and Fracture behavior
AU - Zhang, Zhongqing
AU - Wang, Guopeng
AU - Gao, Yang
AU - Zheng, Zekun
AU - Mao, Xiaoqi
AU - Xu, Junjie
AU - Li, Xiang
AU - Fu, Yongqing
AU - Chen, Minghua
AU - Xu, Shanna
AU - Dong, Longlong
PY - 2025/6/1
Y1 - 2025/6/1
N2 - Titanium matrix composites with homogeneous microstructures often exhibit inferior mechanical properties, thus severely restricting their applications for engineering-structural parts. Inspired by nature's fine microstructures, we have in-situ constructed a novel two-scale structured (TiBw+Ti2Cu)/Ti6Al4V composites for significantly improve the mechanical properties of the Ti matrix, i.e., with the first-scale network reinforced by micro-TiBw and the second-scale network reinforced by nano26 Ti2Cu. Average sizes of α-Ti were significantly refined with adding 2.53vol.% TiBw, and in-situ formed TiBw was favorable for formation of equiaxed α-Ti. At 293 K, yield strength and ultimate tensile strength (UTS) of (2.53vol% TiBw + 3.02vol% Ti2Cu)/Ti6Al4V composites were 1160 MPa and 1272 MPa, respectively, which were 47.2% and 41.0% higher than that of Ti6Al4V. Moreover, their maximum strength (51 MPa) is 27.4% higher than that of Ti6Al4V alloys at 873 K. The remarkable increase in strength for the composites is attributed to fine-grain strengthening and precipitation6 strengthening from Ti2Cu nanoparticles, and high temperature strength is due to the pinning effect of TiBw in the softened matrix and hinderance of flow in the matrix.
AB - Titanium matrix composites with homogeneous microstructures often exhibit inferior mechanical properties, thus severely restricting their applications for engineering-structural parts. Inspired by nature's fine microstructures, we have in-situ constructed a novel two-scale structured (TiBw+Ti2Cu)/Ti6Al4V composites for significantly improve the mechanical properties of the Ti matrix, i.e., with the first-scale network reinforced by micro-TiBw and the second-scale network reinforced by nano26 Ti2Cu. Average sizes of α-Ti were significantly refined with adding 2.53vol.% TiBw, and in-situ formed TiBw was favorable for formation of equiaxed α-Ti. At 293 K, yield strength and ultimate tensile strength (UTS) of (2.53vol% TiBw + 3.02vol% Ti2Cu)/Ti6Al4V composites were 1160 MPa and 1272 MPa, respectively, which were 47.2% and 41.0% higher than that of Ti6Al4V. Moreover, their maximum strength (51 MPa) is 27.4% higher than that of Ti6Al4V alloys at 873 K. The remarkable increase in strength for the composites is attributed to fine-grain strengthening and precipitation6 strengthening from Ti2Cu nanoparticles, and high temperature strength is due to the pinning effect of TiBw in the softened matrix and hinderance of flow in the matrix.
KW - Mechanical properties
KW - Strengthening mechanisms
KW - Titanium matrix composites
KW - Two-scale network structure
UR - https://www.scopus.com/pages/publications/105000025264
U2 - 10.1016/j.compositesa.2025.108868
DO - 10.1016/j.compositesa.2025.108868
M3 - Article
SN - 1359-835X
VL - 193
SP - 1
EP - 14
JO - Composites - Part A: Applied Science and Manufacturing
JF - Composites - Part A: Applied Science and Manufacturing
M1 - 108868
ER -