Acta Metallurgica Sinica (English Letters) ›› 2018, Vol. 31 ›› Issue (4): 423-430.DOI: 10.1007/s40195-018-0714-8

Special Issue: 2018年复合材料专辑 2018年铝合金专辑

• Orginal Article • Previous Articles     Next Articles

Structural Evolution During Mechanical Milling of Bimodal-Sized Al2O3 Particles Reinforced Aluminum Matrix Composite

Ke Zhao1, Dan Tang1, Jin-Ling Liu2,3(), Yi-Guang Wang1   

  1. 1Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi’an 710072, China;
    2 State Key Laboratory of Traction Power, School of Mechanics and Engineering, Southwest Jiaotong University, Chengdu 610031, China
    3 Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province, Southwest Jiaotong University, Chengdu 610031, China
  • Received:2018-02-14 Revised:2018-02-14 Online:2018-04-20 Published:2018-03-25

Abstract:

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.

Key words: Bimodal-sized, Aluminum matrix composite, Mechanical milling, Grain refinement