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首页> 外文期刊>Revista de Metalurgia >Quasicrystalline Al93Fe3Cr2Ti2 alloys
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Quasicrystalline Al93Fe3Cr2Ti2 alloys

机译：准晶Al93Fe3Cr2Ti2合金

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摘要

Aluminium alloy powder having a nominal composition of Al93Fe3Cr2Ti2 (at) has been prepared using gas atomisation. The atomised powder present a microstructure of an aluminium matrix reinforced with a spherical quasicrystalline icosahedral phase, in the range of nanometre in size. The powder was consolidated into bars using warm extrusion. The microstructure of the extruded bars retains the quasicrystalline microstructure and the bars present outstanding mechanical properties, i.e. proof stress of 280 MPa at 300 degrees C. Upon heating the microstructure evolves towards the equilibrium. The thermal evolution was investigated by means of x-ray diffraction, differential scanning calorimeter, scanning electron microscopy and transmission electron microscopy. According to these observations a transformation in two steps is proposed. A first step consists in the decomposition of the supersaturated solid solution of the matrix and the quasicrystals, and a second step in the transformation of the quasicrystals into the equilibrium phases.
机译：采用气体雾化法制备了标称成分为Al93Fe3Cr2Ti2（at%）的铝合金粉末。雾化粉末呈现出铝基体的微观结构，该基体用球形准晶二十面体相增强，尺寸范围为纳米。使用温挤压将粉末固结成棒状。挤压棒材的微观结构保留了准晶微观结构，棒材具有出色的力学性能，即在300°C时承受280 MPa的抗应力。加热后，微观结构向平衡方向发展。采用X射线衍射、差示扫描量热仪、扫描电子显微镜和透射电子显微镜等手段研究了热演化。根据这些观察结果，提出了分两步进行转换。第一步是分解基体和准晶体的过饱和固溶体，第二步是将准晶体转化为平衡相。

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