Effect of multiaxial deformation Max-strain on the structure and properties of Ti-Ni alloy

被引：9
作者：
Khmelevskaya, I. Yu [1 ]
Kawalla, R. [1 ]
Prokoshkin, S. D. [1 ]
Komarov, V. S. [1 ]
机构：
[1] NUST MISIS, Moscow, Russia
来源：
6TH INTERNATIONAL CONFERENCE ON NANOMATERIALS BY SEVERE PLASTIC DEFORMATION (NANOSPD6) | 2014年 / 63卷
关键词：
LATTICE;
D O I：
10.1088/1757-899X/63/1/012108
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The severe plastic deformation (SPD) forming ultrafine-grained (nanocrystalline or nanosubgrained) structure is one of the most effective ways to improve the functional properties of Ti-Ni-based shape memory alloys [1, 2]. In the present work, the SPD of near-equiatomic Ti-Ni alloy was carried out using the multi-axial deformation module Max-strain, which is a part of the physical simulation system "Gleeble 3500". The deformation was performed at a constant temperature of 400 degrees C with speed of 0.5 minis in six passes without interpass pauses. The accumulated true strain was about 3. As a result, a mixed ultrafine-grained/subgrained structure with grain/subgrain sizes from 50 to 300 nm and a high density of free dislocations formed. The resulting structure is close to a nanoscale region and provides a significant advantage in the basic functional property - completely recoverable strain as compared with a conventional recrystallized structure: 7% versus 2%.
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页数：7
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