Al-Cr和Al-Cr-Mn合金系准晶粉末的制备和研究

来源期刊：中南大学学报(自然科学版)1991年第2期

论文作者：陈振华 钱崇梁 王云 蒋向阳 周多三

文章页码：168 - 173

关键词：粉末冶金; 制粉; 快速冷凝; 准晶

Key words：powder metallurgy; powder process; rapid solidifiction; quasicrystalline

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,Al₈₂Cr₁₈和Al₈₂(Mn,Cr)₁₈在10⁵～10⁶K/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。

Abstract: 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 processing 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 10⁵～10⁶K/s, nearly full icosahedral phase Al₈₂Cr₁₈, Al₈₂ (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.