Al_(65)Cu_(20)Fe_(15)合金的凝固组织及二十面体准晶的生成  

SOLIDIFICATION MICROSTRUCTURE OF A1_(65)Cu_(20)Fe_(15) ALLOY AND FORMATION OF ICOSAHEDRAL QUASICRYSTAL

作　　者：张瑞康[1] 王建波[1] 汪大海[1] 刘静[1,2] 陈小梅[1] 桂嘉年[1] 王仁卉[1] 刘静[1,2] 陈方玉 

机构地区：[1]武汉大学物理系,武汉430072 [2]武汉钢铁公司技术中心,武汉430080

出　　处：《金属学报》1999年第5期463-468,共6页Acta Metallurgica Sinica

基　　金：国家自然科学基金!59771049

摘　　要：用Ｘ射线能谱分析、电子背散射衍射和粉末Ｘ射线衍射等技术研究了Ａ１６５Ｃｕ２０Ｆｅ１５合金的铸往及其退火后的显微组织和相组成二发现铸锭中的初生晶是（ＡＩ，Ｃｕ）１３Ｆｅ４；呈明显的枝晶结构枝晶间为十二面体准晶的菱面体近似相（Ｒ相）、ＣｓＣｌ结构的β相和微量的相和相．在随后８００℃退火的过程，和相反应生成二十面体准晶，同时Ｒ相转变成二十面体准晶．退火后空冷，试样由十二面体准晶、少量相和微量的相组成．Microstructures and constituent phases of A165CuZoFe15 alloy, in both as cast state and postcast annealed state, were studied by means of energy dispersive X-ray spectrometry, electron backscat-ter diffraction and powder X-ray diffraction. This study revealed that the primary solidified phase is(Al,Cu)13Fe4 forming severe dendritic structure. Between dendritic arms there are rhombohedral Rphase, an approximant of icosahedral quasicrystal(IQC), β phase of CsCI structure and trace W and Ephases. During subsequent annealing at 800℃, A, P, W and E phases react forming IQC, and R phasetransforms into IQC. The air-cooled sample consists of IQC, small amount of A--(Al,Cu)13Fe4 phase andtrace β-Al(Fe,Cu) phase.

关 键 词：凝固组织 准晶 二十面体 铝合金 

分 类 号：TG146.21[一般工业技术—材料科学与工程]