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On the constitution of Al_4(Cr,Fe)

机译：关于Al_4（Cr，Fe）的组成

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摘要

Using metallographic, diffraction and thermal analysis examinations the base centered orthorhombic Al_4(Cr,Fe) phase reported by Sui et al. (Philos Mag Lett 1995;71:139) was found to be a ternary extension of the Al-Cr eta-phase. The constitution of the Al-Cr-Fe alloy system was specified in a compositional region close to this phase. The Al_(12)Fe_2Cr composition was studied in several works [1-5] after an interesting body-centered orthorhombic (bco) Al_4(Cr,Fe) phase with a approx = 1.25, b approx = 1.25 and c approx = 3.05 nm was reported in this alloy in [1]. The corresponding structural model was proposed in [2] by comparing high-resolution electron microscopy images of this phase with those of hexagonal mu-Al_4Mn, which has a well-known structure. More recently, the crystal structure of this phase of the Al_(80.6)Cr_(10.7)Fe_(8.7) composition also was determined in [3], this time by single-crystal X-ray diffraction, which in general gives more precise results. Essentially the same composition was also reported for a hexagonal v-phase (P6_3/m, a = 4.068 and c = 1.2546 nm) [4], as well as for a C-centered monoclinic phase with lattice parameters a = 3.31, b = 1.23, c = 2.48 nm and beta = 112deg , which was also repor-ted to be formed in an Al_(12)Fe_2Cr alloy [1,5].
机译：Sui等人报道了使用金相，衍射和热分析检查基本中心的正交四方Al_4（Cr，Fe）相。 （Philos Mag Lett 1995; 71：139）被发现是Al-Cr eta相的三元延伸。在接近该相的组成区域中规定了Al-Cr-Fe合金体系的组成。在有趣的体心正交（bco）Al_4（Cr，Fe）相（约= 1.25，b约= 1.25和c约= 3.05 nm）之后，在几篇论文[1-5]中研究了Al_（12）Fe_2Cr的组成在[1]中报道了这种合金。在[2]中，通过比较该相的高分辨率电子显微镜图像与六角形mu-Al_4Mn的结构（具有众所周知的结构），提出了相应的结构模型。最近，在[3]中还确定了Al_（80.6）Cr_（10.7）Fe_（8.7）组成的该相的晶体结构，这次是通过单晶X射线衍射确定的，通常得出更精确的结果。对于六角形v相（P6_3 / m，a = 4.068和c = 1.2546 nm）[4]，以及晶格参数a = 3.31，b = C的单斜晶相，基本上也报告了相同的组成。 1.23，c = 2.48 nm，β= 112deg，据报道也可以在Al_（12）Fe_2Cr合金中形成[1,5]。

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