Layer-stacking irregularities in C36-type Nb-Cr and Ti-Cr Laves phases and their relation with polytypic phase transformations

被引：31

作者：

Aufrecht, J. ^{[1
]}

Baumann, W. ^{[1
]}

Leineweber, A. ^{[1
]}

Duppel, V. ^{[2
]}

Mittemeijer, E. J. ^{[1
,3
]}

机构：

[1] Max Planck Inst Met Res, D-70569 Stuttgart, Germany

[2] Max Planck Inst Solid State Res, D-70569 Stuttgart, Germany

[3] Univ Stuttgart, Inst Mat Sci, D-70569 Stuttgart, Germany

来源：

PHILOSOPHICAL MAGAZINE | 2010年 / 90卷 / 23期

关键词：

line-broadening analysis; intermetallic; phase transformation; X-ray diffraction; crystal defect; HRTEM; DIFFRACTION; STABILITY; CRYSTALS;

D O I：

10.1080/14786435.2010.482068

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Specific layer-stacking irregularities have been identified in C36 (4H) Nb-Cr and Ti-Cr Laves phases on the basis of X-ray diffraction line-profile analysis and high-resolution transmission electron microscopy. Domain boundaries and transformation errors within domains could be distinguished. The layer-stacking irregularities in both C36-NbCr2 and C36-TiCr2 can be associated with a preceding C14 (2H) C36 (4H) phase transformation carried out by glide of mobile synchro-Shockley partial dislocation dipoles in an ordered fashion. The stacking irregularities observed can be interpreted as deviations from such perfect oordered glideo. The interpretation is supported by the observation that, in the case of C36-NbCo2, where no preceding C14 C36 transformation occurs, different layer-stacking irregularities are observed.

引用

页码：3149 / 3175

页数：27

共 29 条

[11] Preparation, phase stability and structure of the C36 Laves phase Nb1-xCo2+x [J].