Al合金のモードII型,モードIII型荷重による応力腐食割れのフラクトグラフィ

概要

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A fractographic study on mode II and mode III static- and cyclic-SCC crack growth in 3.5% NaCl solution has been carried out for a high-strength Al-Zn-Mg alloy. Static- and cyclic-SCC crack growth was introduced under mode II and mode III loads. Unlike the mode I SCC, the fracture surface morphologies of mode II and mode III SCC were characterized by transgranular stress-assisted dissolution, piled-up trench-like dissolution along slip planes, slip planes and slip traces. Transgranular stress-assisted dissolution was dominant in static SCC, whilst piled-up trenchlike dissolution along slip planes, slip planes and slip traces were dominant in cyclic SCC due to repeated stress. Mode II and mode III SCC crack grew at much smaller K values than the thresh-hold stress intensity factor for mode I SCC crack growth, K_<ISCC>.
社団法人日本材料学会の論文
1984-07-15