Al-Cu-Cr系准晶及其类似相的形成规律

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。

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

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.