Ａｌ‐Ｚｎ‐Ｍｇ基合金における機械的性質に及ぼすＭｎ，Ｃｕ添加量の影響
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概要
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The super high strength Al–Zn–Mg based alloy (Mesoalite20®) with a chemical composition of Al–9.5Zn–3Mg–1.5Cu–4Mn–0.5Zr–0.02Ag in mass% includes two type of precipitates of Q and Al6Mn phases. The Q precipitates have a quaternary composition and fine rod-like shape, but Al6Mn has round and irregular shape. After compaction of air-atomized powder by CIP, the Q and Al6Mn phases precipitated in sequence during heating. By hot extrusion at 773 K, their precipitates flowed along extrusion direction and only Q precipitates aligned well, which have been known to be very effective to fiber-reinforcement. When increasing Mn content from 4 to 7 mass% with constant of 1.5 mass% Cu, the amount of Al6Mn increased remarkably. Consequently the compressive strength and plastic elongation to fracture decreased with increasing Mn content. When increasing Cu content from 0.5 to 2.5 mass% with constant of 4 mass% Mn, on the other hand, the amount of Q phase increased and their mechanical property improved slightly with increasing Cu content. Therefore the present study has proposed a new alloy with higher Cu content, which gives higher strength than that of commercial Mesoalite 20.
- 一般社団法人 軽金属学会の論文
一般社団法人 軽金属学会 | 論文
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