Ultraftne grained magnetic shape memory Ni2MnGa -: Based alloys

被引：0

作者：

Pushin, V. G. ^{[1
]}

Kourov, N. I. ^{[1
]}

Korolev, A. V. ^{[1
]}

Yurchenko, L. I. ^{[1
]}

Gunderov, D. V. ^{[2
]}

Valiev, R. Z. ^{[2
]}

Zhu, Y. T. ^{[3
]}

机构：

[1] RAS, Ural Div, Inst Met Phys, 18 S Kovalevskaya St, Ekaterinburg 620041, Russia

[2] USATU, Inst Phys Adv Mat, Ufa 450000, Russia

[3] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

来源：

ULTRAFINE GRAINED MATERIALS IV | 2006年

关键词：

ultrafine gained Ni-Mn-Ga based shape memory alloys;

D O I：

暂无

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

In this work we report the results of investigations of ferromagnetically ordered Hensler Ni2MnGa-based alloys. Our recent studies have shown that super-rapid solidification (SRS) from melt and high-pressure torsion could be effectively used to form homogeneous ultrafine grained structures (nano- and submicrocrystalline) and even amorphous state in these alloys. For the first time nanostructured alloys with magnetically controlled thermoelastic martensitic transformation and shape memory effects were produced using combined methods (SRS+HPT+thermal treatment). Various structural states and their thermal stability, and also martensitic transformations have been analyzed by X-ray and electron diffraction and in situ transmission electron microscopy. We identify in submicro-SRS and nano-HPT alloys a premartensitic state, structures of the low-temperature 5M and 7M martensites, their morphology and temperature evolution. The physical properties were determined by measuring electrical resistance, magnetic susceptibility and other characteristics in a wide temperature interval. We also demonstrate that mechanical and shape memory properties can be enhanced by forming ultrafine-grained structures in these alloys.

引用

页码：453 / +

页数：2