首页> 外文会议>TMS Annual Meeting >INVESTIGATING THE ALPHA TRANSFORMATION-A SOLID-STATE PHASE CHANGE OF DISPERSED INTERMETALLIC PARTICLES FROM AN Al_6(Fe,Mn) PHASE TO AN alpha-Al-(Fe,Mn)-Si PHASE
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INVESTIGATING THE ALPHA TRANSFORMATION-A SOLID-STATE PHASE CHANGE OF DISPERSED INTERMETALLIC PARTICLES FROM AN Al_6(Fe,Mn) PHASE TO AN alpha-Al-(Fe,Mn)-Si PHASE

机译:研究α转化 - 从Al_6(Fe,Mn)相到Alpha-Al-(Fe,Mn)-SI相的分散金属间颗粒的固态相变

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Homogenisation of direct chill (DC)-cast AA3104 can beverage stock aluminium alloy causes intermetallic constituent particles to transform from a tetragonal Al_6(Fe,Mn) phase to cubic alpha-Al-(Fe,Mn)-Si phase. Electron microscopy techniques have been used to investigate this transformation in samples of a model Al-0.5Fe-1.0Mn-0.2Si (wt. percent) alloy during isothermal heat treatments at 500 deg C. Elemental mapping using energy-filtered transmission electron microscopy, together with convergent-beam electron diffraction, has revealed that transformation is eutectoid; diffusion of silicon form the aluminium matrix into the Al_6(Fe,Mn) particles causes transformation to an alpha-Al-(Fe,Mn)-Si/aluminium eutectoid. Nucleation appears to be a key factor controlling the overall transformation rate. After transformation, intragranular eutectoid aluminium coalesces and ripens to become intergranular 'Al-spots'. The particle morphologies have been observed by examining deep-etched samples in a FEGSEM. In addition, manganese diffuses into transformed particles, segregating to grain boundaries.
机译:直接冷却(DC)-CAST AA3104的均匀化可以饮料铝合金使金属间成分颗粒从四边形Al_6(Fe,Mn)相转变为立方α-Al-(Fe,Mn)-SI相。在500℃的等温热处理期间,已经使用电子显微镜技术在模型Al-0.5Fe-1.0mN-0.2SI(WT.%)合金的样品中的这种转化。使用能量过滤的透射电子显微镜进行元素映射。与收敛光束电子衍射一起透露,转化为效果酸;硅的扩散形成铝基质进入Al_6(Fe,Mn)颗粒导致转化为α-Al-(Fe,Mn)-Si /铝eutectoid。成核似乎是控制整体变换率的关键因素。转化后,鞘内共析铝合金铝合金和成熟变成晶间'Al-Spots'。通过检查FEGSEM中的深蚀刻样品来观察颗粒形态。此外,锰扩散成转化的颗粒,分离为晶界。

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