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本文旨在考查各种熔铸工艺因素对ZnAlCuMn合金的组织和性能,特别是对富锰相的大小、形貌和分布的影响,用液淬法研究富锰相结晶和长大的规律,寻求控制锰相的方法. 试验结果表明,浇注温度、静置、精炼和多次重炼对合金的组织和性能的影响并不显著,且上述诸因素均不能有效地控制锰相.锰相在一临界温度以下急剧长大,初步确定该临界温度约为620℃,故合金液不宜在低于该温度下停放过久.变质可以明显细化和钝化锰相.采取适当的工艺措施,可以控制锰相质点绝大多数在1～3μm范围内,形状为蠕虫状或类球状,即使在较长时间保温浇注时也可稳定锰相的大小和形貌.
The purpose of this paper is to examine the microstructure and properties of ZnAlCuMn alloys by various factors affecting the casting process, especially on the size, morphology and distribution of the Mn-rich phase. To study the law of crystallization and growth of the Mn-rich phase by liquid quenching, Manganese phase method.The results showed that pouring temperature, standing, refining and repeated heavy refining on the microstructure and properties of the alloy is not significant, and these factors are not able to effectively control the manganese phase. Manganese phase at a critical The temperature below the rapid growth of the initial determination of the critical temperature is about 620 ℃, so the alloy liquid should not be parked below this temperature for too long. Metamorphism can be significantly refined and passivated manganese phase. Take appropriate measures to control the manganese Most of the phase particles are in the range of 1 ~ 3μm. The shape is worm-like or spheroid-like, and the size and morphology of the manganese phase can be stabilized even when the paste is kept for a long time.