Structural Evolution During Mechanical Milling of Bimodal-Sized Al2O3 Particles Reinforced Aluminum Matrix Composite
来源期刊:Acta Metallurgica Sinica2018年第4期
论文作者:Ke Zhao Dan Tang Jin-Ling Liu Yi-Guang Wang
文章页码:423 - 430
摘 要: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.
Ke Zhao1,Dan Tang1,Jin-Ling Liu2,3,Yi-Guang Wang1
1. Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University2. State Key Laboratory of Traction Power, School of Mechanics and Engineering, Southwest Jiaotong University3. Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province, Southwest Jiaotong University
摘 要: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.
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