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首页> 外文期刊>Philosophical Magazine Letters >Effect of Si on the formation and stability of the icosahedral quasicrystalline phase in Al-Fe-Cr-Ti alloys
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Effect of Si on the formation and stability of the icosahedral quasicrystalline phase in Al-Fe-Cr-Ti alloys

机译：Si对Al-Fe-Cr-Ti合金中二十面体准晶相形成和稳定性的影响

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摘要

The formation and stability of the quasicrystalline icosahedral (i) phase in melt-spun Al_(93-x)Fe_3Cr_2Ti_2Si_x (x = 0-5) ribbons are reported. Samples were characterized by X-ray diffraction, differential scanning calorimetry and transmission electron microscopy. Primitive (P-type) ordered i phase particles were found to be homogeneously distributed in an fcc alpha-Al matrix in the as-melt-spun ribbons. The size of the i phase particles decreased and their thermal stability increased with increasing substitution of Al by Si. The i phase had a decomposition temperature of approximately 480 deg C in an Al_(93)Fe_3Cr_2Ti_2 ribbon whereas that in an Al_(92)Fe_3Cr_2Ti_2Si_1 ribbon was approximately 500 deg C. The phase particles are resistant to coarsening prior to decomposition into crystalline phases. The presence of a small quantity of Si (up to 1.0 at. percent) is beneficial to both the thermal stability and the hardness of nanoquasicrystalline Al-Fe-Cr-Ti alloys.
机译：报道了在熔纺Al_（93-x）Fe_3Cr_2Ti_2Si_x（x = 0-5）薄带中准结晶二十面体（i）相的形成和稳定性。通过X射线衍射，差示扫描量热法和透射电子显微镜对样品进行表征。发现原始（P型）有序的i相粒子均匀分布在熔纺带中的fccα-Al基质中。随着Al被Si取代的增加，i相颗粒的尺寸减小，热稳定性提高。在Al_（93）Fe_3Cr_2Ti_2带中，i相的分解温度约为480摄氏度，而在Al_（92）Fe_3Cr_2Ti_2Si_1带中，i相的分解温度约为500摄氏度。相粒子在分解为结晶相之前具有抗粗化的能力。少量Si（至多1.0at。％）的存在有利于纳米准晶Al-Fe-Cr-Ti合金的热稳定性和硬度。

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