純チタン/Ti – 48 mol%Al 複合調和組織材料の微細組織と機械的特性に及ぼす熱処理の影響

概要

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A harmonic-structured composite with pure titanium and Ti–48mol%Al alloy was produced by mechanical milling and spark plasma sintering process for an improvement of low ductility at room temperature. The harmonic–structured composite has the network area having fine-grained Ti–48mol%Al and the dispersed area having coarse–grained titanium. The effects of the heat treatment at 873 K, 973 K and 1073 K on the microstructure and mechanical properties of the harmonic-structured composite with pure titanium and Ti–48mol%Al alloy was investigated in detail. The microstructure of the harmonic-structured composite is hardly changed after the heat treatment at 873 K, 973 K and 1073 K, except the grain coarsening of titanium in the dispersed area. The Vickers hardness of the harmonic-structured composite remains high hardness after the heat treatment at 873 K, 973 K and 1073 K in spite of 16.5 vol% Ti – Al alloy. The tensile result reveals that the harmonic-structured composite after the heat treatment at 873 K exhibits high strength and especially high ductility.
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