B/Al 複合材料の引張強度に及ぼす製造条件の影響

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The effect of hot-pressing conditions such as temperature, time and pressure on the tensile strength of B/Al(1100) composite was investigated quantitatively. The B/Al(1100) composites were prepared in vacuum by hot-pressing the sandwiches composed alternately of boron fibers and the thin plates of aluminium. The reaction products at the interface of B/Al were identified by X-ray diffraction and transmission electron microscopy (XRD and TEM). This indicates that the (100) plane of α-AlB_<12> crystal formed with the interfacial reaction reaction orients in parallel with the aluminium plane at the interface of B/Al. Increasing press temperature, time and pressure led to the degradation of the tensile strength of the B/Al(1100) composite due to the growth of the α-AlB_<12> phases. The rule of mixtures was successfully applied to the tensile strength of the B/Al(1100) composite, on the assumption that the notches which were formed by fracture of the α-AlB_<12> phases caused loss of the tensile strength of boron fibers. The dependence of the tensile strength (σ_c) of the B/Al(1100) composite on press temperature (T) and time (t) can be expressed by the following equations : σ_c=(2Eγ_s/πX)^<1/2>V_f+σ_m(1-V_f) (Pa) X={2×10^<-8>×exp(-16000/T)×t}^<1/2> (m) where E is the Young's modulus, γ_s the surface energy of boron fiber, V_f fiber volume fraction, σ_m the tensile strength of aluminium and X the thickness of the α-AlB_<12> phase.
社団法人日本鉄鋼協会の論文
1990-02-01

B/Al 複合材料の引張強度に及ぼす製造条件の影響

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