Open AccessTrace Scandium addition on the strength and thermal stability of TiB2 particles reinforced Al-4.5 Cu composites
Author(s) -
Yunliang Zhang,
Wentao Yu,
Xinliang Wang,
Yanqing Xue
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/2133/1/012018
Subject(s) - materials science , composite material , ultimate tensile strength , equiaxed crystals , ductility (earth science) , scandium , microstructure , nucleation , aluminium , metallurgy , creep , chemistry , organic chemistry
Strategies employed for developing ultrahigh strength and scalable ductile particles reinforced aluminium-copper matrix composites (AMCs) are highly desirable and grandly challenging. In the present paper, the Scandium (Sc) micro-alloying TiB 2 particles reinforced Al-4.5 Cu composites were successfully fabricated by the optimized salt-metal reaction method. The observed microstructures displayed that Sc addition could remarkably ameliorate the dispersion of TiB 2 particles, enlarge equiaxed α-Al grain zone and refine the grains on the basis of TiB 2 heterogeneous nucleation. In particular, for the 0.4 wt.% Sc microalloyed 5%TiB 2 /Al-4.5Cu composites, more than a 20 %, 87 %, and 118 % increase in the ultimate tensile strength (UTS), fracture strain elongation (%) and microhardness (HV), respectively were found with respect to the 3 %TiB 2 /Al-4.5Cu composites at room temperature (298K). The improved mechanical properties of strength-ductility synergy were mainly thanks to the homogeneous distribution of TiB 2 particles and modification of Al 2 Cu phase. Moreover, proper Sc also enhanced the elevated-temperature mechanical properties of the composites with the aid of the accelerated precipitation of θ′ phase and much lower coarsens rate.