Structural Evolution During Mechanical Milling of Bimodal-Sized Al2O3 Particles Reinforced Aluminum Matrix Composite
- 90 Downloads
Hybrid aluminum matrix composite powders reinforced with bimodal-sized Al2O3 particles were synthesized by mechanical milling. Two different approaches were investigated for the addition of submicron- and nano-sized Al2O3 particles to the aluminum powders. It was observed that the simultaneous addition of bimodal-sized Al2O3 particles to the aluminum powders resulted in an equiaxed morphology of the composite powders and the average particle size stabilized after 5 h of milling, indicating that the presence of bimodal-sized particles has greater effect on accelerating milling process as compared to nano-sized particles; the grain size of the aluminum matrix in composite powders was reduced to under 40 nm, approximate to the value obtained in the separate addition case, while a lower rate of refining was observed due to hindrance of submicron-sized particles on the interactions between nano-sized particles and the aluminum matrix.
KeywordsBimodal-sized Aluminum matrix composite Mechanical milling Grain refinement
The authors greatly acknowledge the financial support from the State Key Laboratory of Traction Power (Grant No. 2015TPL_Z01), the State Key Laboratory of Solidification Processing (Grant Nos. 82-TZ-2013 and SKLSP201609), the Fundamental Research Funds for the Central Universities (Grant No. 2682017CX090), and the “111” Project (B08040).
- A. Alizadeh, E. Taheri-Nassaj, M. Hajizamani, J. Mater. Sci. Technol. 27, 189 (2015)Google Scholar
- K.A. Annelise, P.B. Carlos, A.B. Felipe, Novel Synthesis and Characterization of Nanostructured Materials (Springer, Berlin, 2013)Google Scholar