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The Formation of Segregation Bands in Al-Si Castings

机译:铝硅铸件中偏析带的形成

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Bands of defects are commonly found in high pressure die cast (HPDC) aluminium alloys.rnIn the work presented here, similar defects have been observed in laboratory gravity dierncastings. Castings were poured with an initial solid fraction in the range fs= 0-0.3 tornsimulate the externally solidified crystals (ESCs) injected in cold chamber HPDC. Therneffect of the fraction of ESCs on the segregation bands at die temperatures in the rangern130 – 450℃ was investigated. In addition, the behaviour of the ESCs during filling hasrnbeen studied. A mechanism describing the formation of the segregation bands has beenrnproposed by considering flow past a solidifying wall layer accounting for mushy zonerndynamics and rheology.
机译:在高压压铸(HPDC)铝合金中通常会发现缺陷带。在这里提出的工作中,在实验室重力压铸中也观察到了类似的缺陷。浇铸的初始固形物含量在fs = 0-0.3范围内,以模拟注入冷室HPDC中的外部凝固晶体(ESC)。研究了在1300-450℃温度范围内ESC组分对偏析带的影响。另外,已经研究了ESC在填充期间的行为。已经提出了一种描述偏析带形成的机制,该机制考虑了流过凝固壁层的流动,这考虑了糊状区域的动力学和流变性。

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