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Optimizing microstructures and mechanical properties of hypereutectic Al18%Si alloy via manipulating its parent liquid state

机译:通过控制母相液态优化过共晶Al18%Si合金的组织和力学性能

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摘要

Liquid state manipulations on solidified Al-18%Si structures and properties were investigated based on its liquid abnormal resistivity-temperature behaviors (LARTB), which suggested a temperature-induced liquid-liquid structural transition (TI-LLST). The primary Si crystals are dramatically refined if solidified from the melt after LARTB range, compared with those before and during it. And then, solidified structures are further ameliorated by suitably mixing the high-temperature melt with low-temperature melt in semisolid state, generating increased tensile strength and ductility synchronously. This work elicits that liquid manipulations for optimizing materials structures and properties can be more effective if information suggesting TI-LLST is detected beforehand.
机译:基于液态Al-18%Si的液态异常电阻率-温度行为(LARTB),研究了对固态Al-18%Si结构和性能的液态操纵,这表明温度引起了液-液结构转变(TI-LLST)。与LARTB之前和期间相比,如果在LARTB范围后从熔体中凝固,则原始Si晶体将得到极大地细化。然后,通过将高温熔体与低温熔体以半固态适当地混合,从而进一步改善凝固组织,同时产生增加的拉伸强度和延展性。这项工作表明,如果事先检测到暗示TI-LLST的信息,则用于优化材料结构和性能的液体处理会更加有效。

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