On the impact of nanometric ?' precipitates on the tensile deformation of superelastic Co49Ni21Ga30

被引：3

作者：

Reul, A. ^{[1
]}

Lauhoff, C. ^{[2
]}

Krooss, P. ^{[2
]}

Somsen, C. ^{[3
]}

Langenkaemper, D. ^{[3
]}

Gutmann, M. J. ^{[4
]}

Pedersen, B. ^{[5
]}

Hofmann, M. ^{[5
]}

Gan, W. M. ^{[6
]}

Kireeva, I. ^{[7
]}

Chumlyakov, Y. I. ^{[7
]}

Eggeler, G. ^{[3
]}

Niendorf, T. ^{[2
]}

Schmahl, W. W. ^{[1
]}

机构：

[1] Ludwig Maximilian Univ Munich, Dept Earth & Environm Sci, Appl Crystallog, D-80333 Munich, Germany

[2] Univ Kassel, Inst Mat Engn, D-34125 Kassel, Germany

[3] Ruhr Univ Bochum, Inst Mat, D-44801 Bochum, Germany

[4] Rutherford Appleton Lab, ISIS Facil, Didcot OX11 0QX, Oxon, England

[5] Tech Univ Munich, Heinz Maier Leibnitz Zentrum MLZ, D-85748 Garching, Germany

[6] Helmholtz Zentrum Hereon, German Engn Mat Sci Ctr GEM MLZ, D-85748 Garching, Germany

[7] Tomsk State Univ, Siberian Phys Tech Inst, Novosobornay Sq 1, Tomsk 634050, Russia

来源：

ACTA MATERIALIA | 2022年 / 230卷

关键词：

Martensitic transformation; Microstructure; Neutron diffraction; Single crystals; Superelasticity; SHAPE-MEMORY ALLOY; CO-NI-GA; SINGLE-CRYSTALS; MARTENSITIC-TRANSFORMATION; PHASE-TRANSFORMATIONS; COMPRESSION ASYMMETRY; CYCLIC DEFORMATION; MICROSTRUCTURE; PSEUDOELASTICITY; MECHANISMS;

D O I：

10.1016/j.actamat.2022.117835

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Results are presented reporting on the martensite domain variant selection and stress-induced martensite morphology in [001]-oriented superelastic Co49Ni21Ga30 shape memory alloy (SMA) single crystals under tensile load. In situ neutron diffraction, as well as in situ optical-and confocal laser scanning microscopy were conducted focusing on three differently treated samples, i.e. in the as-grown, solution-annealed and aged condition. An aging treatment performed at 350 ? promotes the precipitation of nanoprecipitates. These second phase precipitates contribute to an increase of the number of habit plane interfaces, while reducing lamellar martensite plate thickness compared to the as-grown and solution-annealed (precipitate free) samples. During tensile loading, all samples show a stress-induced formation of martensite, characterized by one single domain variant ( "detwinned ") and one set of parallel habit planes in a shear band. The results clearly show that gamma' nanoprecipitates do not necessarily promote multi-variant interaction during tensile loading. Thus, reduced recoverability in Co-Ni-Ga SMAs upon aging cannot be solely attributed to this kind of interaction as has been proposed in literature so far.& nbsp;(C) 2022 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页数：11

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