【摘要】 研究添加富铈混合稀土的ZM5合金在铸态和固溶处理后的显微组织与力学性能。结果表明,添加适量的混合稀土能显著提高ZM5合金强度,合适的RE添加量对铸态合金为1.5%,固溶处理合金合为0.75%。固溶处理使未添加稀土的ZM5合金偏析产生的晶界沉积相(-βMg17Al12)和含Mn的中间相(Al6Mn,Al4Mn)溶解而改善合金的塑性。对添加稀土的ZM5合金,固溶处理不仅使-βMg17Al12相溶解,还使粗大棒状的Al11RE3熔断而细化、球化,从而显著提高合金的强度和塑性。更多还原

【Abstract】 The microstructure and the mechanical performances of ZM5 magnesium alloys with RE-Ce addition in as-cast and solid-solution treatment state are investigated.The results show that the strength of the ZM5 magnesium alloy is remarkably enhanced by RE-Ce addition,the optimal dosage of RE-Ce is 1.5% and 0.75% for the ascast ZM5 and solid-solution treated ZM5,respectively.The plasticity of the ZM5 with no RE content is improved by solid-solution treatment since the β-Mg17Al12 phase and Al6Mn,Al4Mn pellets in the microstructure of alloy are solved.In solid-solution treatment of the ZM5 magnesium alloys with RE-Ce addition,not only β-phase is solved but large Al11RE3-phse in stick form is also broken and becomes smaller and sphere,so the strength and plasticity of the alloys are evidently enhanced.更多还原