Effect of B4C Particle Size on the Microstructure and Mechanical Properties of High Volume Fraction Aluminum Matrix Composite Fabricated by Pressureless Infiltration
CAO Leigang, WANG Xiaohe, CUI Yan, YANG Yue, LIU Yuan
School of Mechanical and Materials Engineering, North China University of Technology, Beijing 100144
Abstract: The boron carbide (B4C) particles with average particle size of 2.0 μm and 38 μm were used to prepare B4C preforms with particle-size distributions being 100% 38 μm, 20% 2.0 μm+80% 38 μm and 100% 2.0 μm, respectively. Correspondingly, three kinds of high volume fraction B4C/Al composites were prepared by pressureless infiltration and the effects of particle size of boron carbide on the phase constitution, microstructure and mechanical properties of the composites were investigated.The results show that all of the B4C/6061Al composites present the same phase constitution, including B4C, Al, Al3BC, AlB2 and Fe-Mn-rich phases. When the reinforcing phase is completely large particle, B4C particles are uniformly distributed in the composite. The degree of the interface reaction is weak, with the random distribution of the interface pro-ducts, AlB2 and Al3BC. The hardness and flexural strength of the corresponding composite are 23.2HRC and 406 MPa, respectively. B4C fine particle possesses higher specific surface area than that of the large particle and, therefore, the actual contact area between B4C fine particles and the molten aluminum alloy is larger, resulting in the severe interfacial reaction. With 20% of B4C fine particles being involved, the consumption of the aluminum matrix increases in the composite, wherein B4C large particle also present a uniform distribution characteristic. Within the region between the large particles, the remaining fine particles are uniformly distributed in the interface products. Due to the increasing fraction of the initial B4C particles and the interfacial products, the hardness of the composite increases to 40.02HRC, and the flexural strength increases slightly to 425 MPa with a decreasing strain. When the reinforcing phase is completely fine particles, aluminum is consumed in a large amount by the severe interfacial reaction in the composite, wherein Al3BC and AlB2 become the dominant phases, and the remaining B4C particles are uniformly distributed in the ceramic phase matrix. The hardness of the composite improves to 56.8HRC. However, the flexural strength of the composite drops to 248 MPa, which is due to the presence of the micropore defects derived from the high-temperature sintering process of B4C fine particle.
曹雷刚, 王晓荷, 崔岩, 杨越, 刘园. 碳化硼粒度对无压浸渗高体分铝基复合材料微观组织和力学性能的影响[J]. 材料导报, 2019, 33(20): 3472-3476.
CAO Leigang, WANG Xiaohe, CUI Yan, YANG Yue, LIU Yuan. Effect of B4C Particle Size on the Microstructure and Mechanical Properties of High Volume Fraction Aluminum Matrix Composite Fabricated by Pressureless Infiltration. Materials Reports, 2019, 33(20): 3472-3476.
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2019, Vol. 33 
