B_4C被覆ボロン繊維強化Al複合材の引張強さに及ぼすホットプレス温度の影響

概要

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For the purpose of investigating the effect of interfacial bonding between a fiber and a matrix on the tensile strength of FRM, several B_4C coated boron fiber reinforced Al composites were prepared by controlling the hot-pressing temperature. The tensile-test showed that the composites prepared at 550℃ exihibited a higher strength than the composites prepared at 500℃ and 600℃. The fracture surfaces were changed from a rugged face like a bundle break to a flat face with an increase in the temperature. It was seen from SEM that the interfacial bonding became stronger. So, the transition in the composites' strength was considered as follows ; As the hot-pressing temperature rises, the critical fiber length, a factor determining a fiber's strength in a matrix, becomes gradually shorter, but the stress concentration factor to the adjacent fibers caused by a fiber fracture also becomes larger. Therefore, the higher strength of the composites results in the case that these two factors are properly overlapped. Such a transition of the composites' strength was additionally supported by Batdorf's theory.
一般社団法人日本機械学会の論文
1987-02-25