SiCウイスカ強化A2024複合材料の高温疲労破面

概要

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Fatigue properties and fatigue fracture mechanism were examined for SiC whisker reinforced A2024 aluminium matrix (SiCw/A2024) composite at 150℃. The fatigue strength tested at 150℃ increased with increasing the volume fraction of Sic whisker up to 20%, although they were generally lower than those tested at R.T.. Fractographic analysis revealed that Mode I fatigue crack was formed by Stage I mechanism in SiCw/A2024 composite at 150℃ in the same manner as that in A2024 matrix alloy. In the fatigue crack propagation region, the area fraction of dimple patterns for SiCw/A2024 composite tested at 150℃ was smaller than that for the same composite tested at R.T.. It is suggested that SiC whiskers would have a much effect to Mode I crack initiation and propagation, but this effect becomes less significant at 150℃ than that at R.T.
社団法人日本材料学会の論文
1991-06-15