首页> 外文会议>Materials forum - aluminium alloys, their physical and mechanical properties - Volume 28 - 2004 >Thixotropic Structure Formation in Hypoeutectic Al-Si Alloys byControlled Nucleation
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Thixotropic Structure Formation in Hypoeutectic Al-Si Alloys byControlled Nucleation

机译:控制共晶形成亚共晶Al-Si合金的触变结构

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Semisolid metal forming requires feedstock material with a fine-grained, non-dendriticrnstructure to achieve thixotropic properties. In this study, a Controlled Nucleation methodrnwithout stirring was used for the formation of thixotropic structures. Hypoeutectic Al-Sirnalloy was cast into a permanent mould using different pouring temperatures, with andrnwithout gauze. As the pouring temperature increased, the grain size increased and therntendency to form columnar grains also increased. Gauze experiments show that thernmechanism of the "wall crystals" plays a very important role at low pouring temperatures.rnThe survival rate of the wall crystals determines the final thixotropic structure includingrnboth grain size and morphology up to 675℃ pouring temperature, while other nucleationrnmechanisms might operate at higher temperatures.
机译:半固态金属成型需要具有细粒非树枝状结构的原料来实现触变性。在这项研究中,采用不搅拌的可控成核方法来形成触变结构。使用不同的浇铸温度将亚共晶Al-Sirnalloy浇铸到永久铸模中,且无纱布。随着浇注温度的升高,晶粒尺寸增加,形成柱状晶粒的强度也增加。纱布实验表明,在低浇注温度下,“壁晶”的机理起着非常重要的作用。壁晶的存活率决定了最终的触变结构,包括在675℃浇注温度下的晶粒尺寸和形貌,而其他成核机理可能起作用在更高的温度下。

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