Al-Cu-Cr系准晶及其类似相的形成规律  

The formation regulation of quasicrystals and approximants in Al-Cu-Cr

作　　者：齐育红[1] 张占平[1] 刘德良[1] 马永庆[1] 黑祖昆[1] 杜学鹏[1] 

机构地区：[1]大连海事大学机电与材料工程学院,辽宁大连116026

出　　处：《材料热处理学报》2007年第B08期310-313,共4页Transactions of Materials and Heat Treatment

摘　　要：本文为了探明Al-Cu-Cr系准晶及其类似相的形成规律,以指导Al-Cu-Cr系准晶合金设计。通过分析研究用热压法制备的Al-Cu-Cr准晶与纯铝的复合材料中不同条件下形成的各个Al-Cu-Cr相的成分和结构,绘制了Al-Cu-Cr三元成份-结构相图,结果表明相图中存在两条等电子浓度线,一条是二十面体准晶及其类似相的等电子浓度线,电子浓度e/a=1.86;另一条是十次准晶及其类似相的等电子浓度线,电子浓度e/a=2.09。这充分证实了准晶及其类似相是电子相,服从Hume-Rothery规则。In order to understand the formation regulation of Quasicrystals and Approximants in Al-Cu-Cr and guide the alloy design of Al-Cu-Cr quasicrystals, The composition and microstructure of Al-Cu-Cr phases formed in the Al-Cu-Cr qusicrystals/Al composites synthesized by hot-pressing were analyzed using electron probe, transmission electron microscope, scanning electron microscope and x-ray diffraction. The results show there are double e/a-constant line in the Al-Cu-Cr concentration diagram. The iconsahadral quasicrystals and its approximants exist on or near to a line at constant electron per atom e/a= 1.86, the dacagonal quasicrystals and its approximants exist on or near to a line at e/a=2.09. The Fermi sphere in these phases nearly touches their respective pseudo-Brillouin zones defined by the intense diffraction spots, thus these quasicrystals and approximants are Hume-Rothery phases.

关 键 词：Al-Cu-Cr合金 准晶 类似相 成份-结构相图 等电子浓度线 

分 类 号：TG146.21[一般工业技术—材料科学与工程]