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
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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Mn、Cu添加量对Al-Zn-Mg基合金力学性能的影响
DOI：
10.2464/jilm.54.2
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
健 菊地
中科院分区：
文献类型：
--
作者：
広朗 清水;光造 長村;大樹 足立;潤 楠井;健 菊地
化学成分为Al-9.5Zn-3 Mg-1.5Cu-4Mn-0.5Zr-0.02Ag的超高强度Al-锌-镁基合金(Mesoalite20®)包括Q相和Al6Mn相两种析出相。Q相为四元组分，呈细小棒状，而Al6Mn为圆形和不规则形。空气雾化粉末经CIP压制后，加热过程中依次析出Q相和Al6Mn相。773K热挤压时，它们的析出物沿挤压方向流动，只有Q析出物取向良好，这对纤维增强是非常有效的。当铜的质量分数为1.5%时，当锰含量从4%增加到7%时，Al6Mn的含量显著增加。因此，抗压强度和塑性断裂伸长率随锰含量的增加而降低。当铜含量从0.5%增加到2.5%(质量分数为4%)时，随着铜含量的增加，Q相的数量增加，力学性能略有提高。因此，本研究提出了一种新的铜含量更高的合金，该合金的强度比商品中沸石20合金的强度高。
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.