摘要
文中给出了Al-Cr和Al-Cr-Mn合金系准晶粉末的制取方法,同时对准晶粉末的形貌、成分、衍射特征和热稳定性能进行了研究,并且采用计算机对高温衍射数据进行了处理,绘制了准晶动态相变图。结果表明,在Al-Cr和Al-Cr-Mn合金系列之中,合金成分和冷却速度对二十面体相的形成有很大影响,Al_(82)Cr_(18)和Al_(82)(Mn,Cr)_(18)在10~5～10~6K/s的冷却速度下,能够得到几乎完全的二十面体的准晶粉末。在Al-Cr合金中,随着Cr含量的增加,提高了准晶相的热稳定性,添加第三组元Mn,也能提高准晶相的热稳定性。
This paper deals with the producing technique of Al-Cr, Al-Cr-Mn alloy quasicrystalline powders and their morphology, composition, diffraction pattern, thermal stability. By means of computer pro- cessing of elevated temperature X-ray diffraction data, kinetic phase transformation diagrams were plotted. The present rasearch shows that in Al-Cr, Al-Cr-Mn alloys, the composition and cooling rate dramatically affect the formation of icosahedral phase; at the cooling rate of 10~5～10~6K/s, nearly full icosahedral phase Al_(82)Cr_(18), Al_(82) (Mn, Cr)_(18) powders can be produced. For Al-Cr alloy, thermal stability of quasicrystalline phase is improved with the increasing of the Cr content. The addition of the third constituent——Mn can improve the thermal stability of quasicrystalline Phase too.
基金
国家自然科学基金
