Nanoscale twinning in Fe-Mn-Al-Ni martensite: a backscatter Kikuchi diffraction study

被引：11

作者：

Fischer, Peter D. B. ^{[1
]}

Martin, Stefan ^{[1
]}

Walnsch, Alexander ^{[1
]}

Thuemmler, Martin ^{[1
]}

Kriegel, Mario J. ^{[1
]}

Leineweber, Andreas ^{[1
]}

机构：

[1] TU Bergakad Freiberg, Inst Mat Sci, Gustav Zeuner Str 5, D-09599 Freiberg, Germany

来源：

JOURNAL OF APPLIED CRYSTALLOGRAPHY | 2021年 / 54卷

关键词：

electron backscatter diffraction; martensite; shape-memory alloys; twinning; backscatter Kikuchi diffraction;

D O I：

10.1107/S1600576720013631

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Iron-based Fe-Mn-Al-Ni shape-memory alloys are of rather low materials cost and show remarkable pseudoelastic properties. To further understand the martensitic transformation giving rise to the pseudoelastic properties, different Fe-Mn-Al-Ni alloys have been heat treated at 1473 K and quenched in ice water. The martensite, which is formed from a body-centred cubic austenite, is commonly described as face-centered cubic (f.c.c.), even though there are also more complex, polytypical descriptions of martensite. The presently studied backscatter Kikuchi diffraction (BKD) patterns have been evaluated, showing a structure more complex than simple f.c.c. This structure can be described by nanoscale twins, diffracting simultaneously in the exciting volume. The twinned structure shows a tetragonal distortion, not uncommon for martensite in spite of the lack of interstitial elements. These features are evaluated by comparing the measured BKD patterns with dynamically simulated ones.

引用

页码：54 / 61

页数：8

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