| Autor: |
Zheng X; School of Materials and Chemical Engineering, Hubei University of Technology, Wuhan 430068, China.; Key Laboratory of Green Materials for Light Industry of Hubei Provincial, Wuhan 430068, China., Long W; School of Materials and Chemical Engineering, Hubei University of Technology, Wuhan 430068, China.; Key Laboratory of Green Materials for Light Industry of Hubei Provincial, Wuhan 430068, China.; Hubei Engineering Laboratory of Automotive Lightweight Materials and Processing, Wuhan 430068, China., Zhu C; School of Materials and Chemical Engineering, Hubei University of Technology, Wuhan 430068, China.; Key Laboratory of Green Materials for Light Industry of Hubei Provincial, Wuhan 430068, China.; Hubei Engineering Laboratory of Automotive Lightweight Materials and Processing, Wuhan 430068, China., Zhao L; School of Materials and Chemical Engineering, Hubei University of Technology, Wuhan 430068, China.; Key Laboratory of Green Materials for Light Industry of Hubei Provincial, Wuhan 430068, China.; Hubei Engineering Laboratory of Automotive Lightweight Materials and Processing, Wuhan 430068, China., Hu X; School of Materials and Chemical Engineering, Hubei University of Technology, Wuhan 430068, China.; Key Laboratory of Green Materials for Light Industry of Hubei Provincial, Wuhan 430068, China.; Hubei Engineering Laboratory of Automotive Lightweight Materials and Processing, Wuhan 430068, China., Liu S; School of Materials and Chemical Engineering, Hubei University of Technology, Wuhan 430068, China.; Key Laboratory of Green Materials for Light Industry of Hubei Provincial, Wuhan 430068, China.; Hubei Engineering Laboratory of Automotive Lightweight Materials and Processing, Wuhan 430068, China., Jiang W; State Key Laboratory of Material Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan 430074, China., Peng Y; School of Materials and Chemical Engineering, Hubei University of Technology, Wuhan 430068, China. |
| Abstrakt: |
Dual-scale (nano and micron) particle-reinforced TiB 2 /6061Al matrix composites with different contents of TiB 2 were prepared using powder metallurgy, and then analyzed via microstructure observation and tests of microhardness, tensile properties, and friction and wear properties. The 6061Al powders' particles changed from spherical to flaky after two rounds of high-energy ball milling, and the TiB 2 enhancer was embedded in or wrapped by the matrix particles after high-energy ball milling. Metallurgical bonding between TiB 2 particles and the matrix was achieved, and Al 3 Ti was synthesized in situ during sintering. The hot-pressing process eliminated the internal defects of the composites, and the TiB 2 particles were diffusely distributed in the matrix. The best comprehensive mechanical properties (hardness and tensile strength) were achieved when the mass fraction of TiB 2 was 5% (1% micron + 4% nano); the hardness and tensile strength of the composites reached 131 HV and 221 MPa-79.5% and 93.9% higher than those of the pure matrix, respectively. The composites' average coefficient of friction and volumetric wear rate were reduced. Composites with a TiB 2 mass fraction of 7% (3% micron + 4% nano) had the highest average coefficients of friction and the lowest volumetric wear rate of 0.402 and 0.216 mm 3 ∙N -1 ∙m -1 , respectively. It was observed that adhesion influences the friction mechanism, which transitions from adhesive wear with slight oxidative wear to abrasive wear. |
