Influence of γ′ nanometric particles on martensitic transformation and twinning structure of L10 martensite in Co-Ni-Ga ferromagnetic shape memory single crystals

被引：27

作者：

Kireeva, I. V. ^{[1
]}

Pons, J. ^{[2
]}

Picornell, C. ^{[2
]}

Chumlyakov, Yu. I. ^{[1
]}

Cesari, E. ^{[2
]}

Kretinina, I. V. ^{[1
]}

机构：

[1] Natl Res Tomsk State Univ, Siberian Phys Tech Inst VD Kuznetsova, Tomsk 634050, Russia

[2] Univ Illes Balears, Dept Fis, E-07122 Palma De Mallorca, Spain

来源：

INTERMETALLICS | 2013年 / 35卷

关键词：

Shape-memory effects; Martensitic transformations; Electron microscopy; transmission; Twinning; Precipitates; HIGH-TEMPERATURE SUPERELASTICITY; MAGNETIC-PROPERTIES; ALLOY; PSEUDOELASTICITY; MICROSTRUCTURE; DEFORMATION; MECHANISMS;

D O I：

10.1016/j.intermet.2012.10.018

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Ageing treatments at 620 K performed in ferromagnetic Co49Ni21Ga30 shape memory single crystals have been found to generate dense dispersions of nanometric gamma' precipitates in the austenitic matrix. These particles have a strong influence on the B2-L1(0) martensitic transformation, decreasing the overall transformation temperatures and enhancing the transformation range (difference between the temperatures for start and finish of transformation) and hysteresis. The martensitic microstructure is strongly affected as well, in such a way that the thickness of martensitic twins depends on the size and shape of particles (spherical or elongated). The results indicate that, in case of precipitation of spherical particles with diameters similar to 3-5 nm, the martensitic twins can absorb the particles and the twin thickness is still considerably larger than the precipitate diameter, while growth of larger and elongated particles with a length of 10-25 nm leads to the formation of tiny twins in between the particles with thickness of similar to 3-4 nm. These small martensite twins present an additional internal modulation and satellite spots in the diffraction pattern. (C) 2012 Elsevier Ltd. All rights reserved.

引用

页码：60 / 66

页数：7

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