Effect of biaxial cyclic severe deformation on structure and properties of Ti-Ni alloys

被引：20

作者：

Komarov, V ^{[1
,3
]}

Khmelevskaya, I ^{[1
]}

Karelin, R. ^{[1
]}

Prokoshkin, S. ^{[1
]}

Zaripova, M. ^{[2
]}

Isaenkova, M. ^{[2
]}

Korpala, G. ^{[3
]}

Kawalla, R. ^{[3
]}

机构：

[1] Natl Univ Sci & Technol MISIS, Moscow, Russia

[2] Natl Res Nucl Univ MEPhI, Moscow, Russia

[3] TU Bergakad Freiberg, Freiberg, Germany

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2019年 / 797卷

关键词：

Shape memory alloys; Ti-Ni; Thermomechanical treatment; Severe plastic deformation; Nanostructured materials; Structure parameters; QUASI-CONTINUOUS DEFORMATION; FUNCTIONAL-PROPERTIES; STRAIN;

D O I：

10.1016/j.jallcom.2019.05.127

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：

In this work, biaxial cyclic severe deformation of Ti-50.0 at.% Ni shape memory alloy was performed using MaxStrain module of Gleeble system at 250 degrees C with ultimately high accumulated true strain of e = 11. The martensitic transformations, structure and crystallographic texture features were studied using DSC, X-ray diffractometry, and TEM from three mutually perpendicular sides. The maximum completely recoverable strain was determined by a thermomechanical method, and the hardness was measured. A true nanocrystalline structure with grain/subgrain size of 50 nm has been formed in bulk Ti-Ni samples for the first time. The resulting structure is crystallographically isotropic and provides the completely recoverable strain of 9.6% that exceeds the best result attained for bulk equiatomic Ti-Ni alloys. The texture factor in a combination with the structure factor contribute to the completely recoverable strain only until accumulated strain reaches e = 9.5 at higher deformation temperatures. (C) 2019 Elsevier B.V. All rights reserved.

引用

页码：842 / 848

页数：7

共 31 条

[11] Effect of Biaxial Isothermal Quasi-Continuous Deformation on Structure and Shape Memory Properties of Ti-Ni Alloys [J].