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首页> 外文期刊>Metallurgical and Materials Transactions, A. Physical Metallurgy and Materials Science >The Effect of Solution Heat Treatment and Quenching Rates on Mechanical Properties and Microstructures in AlSiMg Foundry Alloys
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The Effect of Solution Heat Treatment and Quenching Rates on Mechanical Properties and Microstructures in AlSiMg Foundry Alloys

机译：固溶热处理和淬火速率对AlSiMg铸造合金力学性能和显微组织的影响

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摘要

Four common AlSiMg foundry alloys have been solution heat treated at 813 K, quenched, and immediately aged at 423 K for up to 240 minutes. The mechanical properties are found to be related to the amount of Mg and Si in the alloys. A high strength is obtained after only 60 minutes of solution heat treatment, indicating that the solid solution is rapidly saturated on Mg and Si. The ductility is very much related to the amount of silicon present and the refinement of the silicon crystals within the eutectic areas, since silicon crystals are observed to crack when load is applied. Thus, a well-modified structure is the best way to obtain high ductility. Reduced quenching rates after solution heat treatment lead to a lower strength, since a lower number of hardening #beta#'-Mg_2Si precipitates are formed. The ductility of alloys with 0.6 wt pct Mg is increased with a reduced quenching rate. A more ductile matrix corresponding to the lower amount of hardening precipitates can explain this. Alloys with 0.2 wt pct Mg remain relatively unchanged. A hypothesis that may explain this phenomenon is the precipitation of brittle silicon or formation of coarse Mg2Si within the dendrites.
机译：已对四种常见的AlSiMg铸造合金进行了813 K的固溶热处理，淬火，并立即在423 K进行时效长达240分钟。发现机械性能与合金中Mg和Si的含量有关。固溶热处理仅60分钟即可获得高强度，表明固溶体在Mg和Si上迅速饱和。延展性与存在的硅的数量以及共晶区域内硅晶体的细化程度密切相关，因为观察到在施加载荷时硅晶体会破裂。因此，经过良好修改的结构是获得高延展性的最佳方法。固溶热处理后降低的淬火速率导致较低的强度，因为形成了较少数量的硬化#beta＃'-Mg_2Si沉淀物。 Mg为0.6 wt％的合金的延展性随着淬火速率的降低而增加。对应于较少量硬化沉淀的更具延展性的基体可以解释这一点。 Mg为0.2 wt％的合金保持相对不变。一个可以解释这种现象的假说是脆性硅的沉淀或树枝状晶体中形成的粗Mg2Si。

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