Conventional and in-situ transmission electron microscopy investigations into multistage martensitic transformations in Ni-rich NiTi shape memory alloys

被引：22

作者：

Dlouhy, A. ^{[1
]}

Bojda, O. ^{[1
,2
]}

Somsen, Ch. ^{[3
]}

Eggeler, G. ^{[3
]}

机构：

[1] Acad Sci Czech Republ, Inst Phys Mat, CS-61662 Brno, Czech Republic

[2] Brno Univ Technol, Fac Chem, Brno 61200, Czech Republic

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

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2008年 / 481卷

关键词：

NiTi shape memory alloys; Ni4Ti3; precipitates; heat-treatment; multi-step martensitic transformations;

D O I：

10.1016/j.msea.2007.04.123

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Investigations of multi-step martensitic transformations in Ni-rich NiTi single crystals and polycrystals are reported. Attention is mainly given to processes that involve a two-step R -> B19' transition. Single crystals and polycrystals with a Ni content close to 51 at.% were subjected to standard heat-treatments during which microstructures with a homogeneous distribution of Ni4Ti3 precipitates form. Results obtained using differential scanning calorimetry and conventional and in-situ transmission electron microscopy clearly show that these microstructures transform from R phase into B19' martensite in two steps. We suggest that the nucleation conditions for the B19' phase must be taken into account to rationalize the obtained results. (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：409 / 413

页数：5

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