Studies of composition, deformation temperature and pressure effects on structure formation in severely deformed TiNi-based alloys

被引：22

作者：

Khmelevskaya, I. Yu.

Prokoshkin, S. D.

Dobatkin, S. V.

Tatyanin, E. V.

Trubitsyna, I. B.

机构：

[1] Moscow State Inst Steel & Alloys, Moscow 119049, Russia

[2] Russian Acad Sci, Baikov Inst Met & Mat Sci, Moscow 119049, Russia

[3] Russian Acad Sci, Inst High Pressure Phys, Troitsk, Russia

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2006年 / 438卷

关键词：

shape memory alloys; high pressure torsion; transmission electron microscopy; nanocrystalline structure; amorphization;

D O I：

10.1016/j.msea.2006.02.088

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Structure formation in TiNi-based shape memory alloys in dependence on deformation temperature (-196 to 400 degrees C) and pressure (4-8 GPa) under conditions of high-pressure torsion (HPT) was studied using transmission electron microscopy and X-ray diffraction methods. The tendency to form an amorphous structure depends on the relative positions of the deformation temperature and the martensite start temperature. Isothermal martensitic transformation is observed in the Ti-48.5 at.% Ni alloy as a result of 10-year keeping at room temperature after HPT. Increasing of pressure suppresses the tendency to form an amorphous structure. The upper deformation temperature limits for amorphous and nanocrystalline structures formation are determined. The thermomechanical conditions of the equal-channel angular pressing for obtaining actual nanocrystalline structure are recommended. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：472 / 475

页数：4

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