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Analysis of the 355 Aluminium Alloy Microstructure for Application in Thixoforming

机译:355铝合金微观结构分析触变中的应用

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The 355 aluminium alloy is known to have excellent thermodynamic characteristics that render it suitable as a raw material for rheocasting and thixoforming. However, besides the controllable transition from solid to liquid phase, the refined microstructure required in the semisolid range is one of the key factors with a strong influence on the rheology of the material. This paper intends to analyse the in situ behaviour of the microstructure, in terms of morphological change, using high-temperature laser scanning confocal microscopy. The 355 alloy was prepared via conventional casting, and refined with a 30-s exposition via ultrasonic melt treatment (UST - 20 Hz, 2 kW). The material was reheated up to the thixoforming target temperature of 595°C at which it was maintained for 0, 30, 60, 90, and 120 s, after which all the samples were cooled in water. The samples subjected to UST prior to the heat treatment were more refined in terms of microstructural evolution; they exhibited reduction in grain size (~107 ± 16 μm), smallest primary phase particle size (~81 ± 7 μm), and high circularity shape factor (~0.59 ± 0.19 μm). In situ observation methods were employed to analyse evolution mechanisms such as Ostwald ripening and coalescence.
机译:已知355铝合金具有优异的热力学特性,使其适合作为用于搅拌和触变的原料。然而,除了从固体到液相的可控过渡之外,半固体范围内所需的精细组织是对材料流变影响的关键因素之一。本文旨在利用高温激光扫描共焦显微镜来分析微观结构的原位行为。通过常规浇铸制备355合金,并通过超声波熔体处理(UST-20Hz,2kW)精制30秒。将该物质重新加热到硫型靶温度为595℃,其保持为0,30,60,90和120秒,之后将所有样品在水中冷却。在微观结构进化方面,在热处理之前经过优化的样品更加精细;它们表现出晶粒尺寸的降低(〜107±16μm),最小的初级相粒径(〜81±7μm),高圆形形状因子(〜0.59±0.19μm)。在原位观察方法中用于分析进化机制,例如Ostwald成熟和聚结。

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