Metadislocations in the complex metallic alloys T-Al-Mn- (Pd, Fe)

被引：10

作者：

Heggen, M. ^{[1
]}

Houben, L. ^{[1
]}

Feuerbacher, M. ^{[1
]}

机构：

[1] Forschungszentrum Julich, Inst Festkorperforsch, D-52425 Julich, Germany

来源：

ACTA MATERIALIA | 2011年 / 59卷 / 11期

关键词：

High-resolution electron microscopy (HREM); Aluminium alloys; Dislocation structure; Phase transformations; APPROXIMANT;

D O I：

10.1016/j.actamat.2011.03.069

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We investigate dislocations in the complex metallic alloys T-Al-Mn-Pd and T-Al-Mn-Fe using high-resolution aberration-corrected scanning transmission electron microscopy. The dislocations consist of a large core and separated escort defects [1]. Upon movement, dislocations and escort defects locally transform the material and introduce stacks of planar faults which represent a slab of a different but related structure. Deformation modes involving glide and climb are observed. We find different types of dislocations with Burgers vectors (b) over bar = -(-tau)(-n)(0 0 1), with n = 2, 3, 4. They are associated to two, four and six planar faults, respectively, and are identified as metadislocations. The structural connection between metadislocations in the present phase and those in R-, epsilon(6)-, and xi-phases is discussed. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：4458 / 4466

页数：9

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