Paper Title:
Mechanical Behavior and Stress-Induced Martensitic Transformation in Nanocrystalline Ti49.4Ni50.6 Alloy
  Abstract

Amorphous-nanocrystalline Ti49.4Ni50.6 alloy in the shape of a disc 20 mm in diameter has been successfully produced using high pressure torsion (HPT). Application of HPT and annealing at temperatures of 300–550°C resulted in formation of a nanocrystalline (NC) structure with the grain size (D) about 20–300 nm. The HPT samples after annealing at Т = 400°C with the D= 20 nm possess high yield stress and high ultimate tensile strength (more than 2000 MPa). There is an area of strain-induced transformation B2-B19’ on the tensile curve of the samples with the grain size D =20 nm. The stress of martensitic transformation (σm) of samples is 450 MPa, which is three times higher than σm in the initial coarse-grained state (σm ≈ 160 MPa). The HPT samples after annealing at Т = 550°C with the D= 300 nm possess high ductility (δ>60 %) and high ultimate tensile strength (about 1000 MPa).

  Info
Periodical
Materials Science Forum (Volumes 584-586)
Edited by
Yuri Estrin and Hans Jürgen Maier
Pages
470-474
DOI
10.4028/www.scientific.net/MSF.584-586.470
Citation
E. Prokofiev, D. Gunderov, A. Lukyanov, V. Pushin, R. Valiev, "Mechanical Behavior and Stress-Induced Martensitic Transformation in Nanocrystalline Ti49.4Ni50.6 Alloy", Materials Science Forum, Vols. 584-586, pp. 470-474, 2008
Online since
June 2008
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Wen Jun He, Guang Hui Min, Oleg V. Tolochko
Abstract:Crystal structures and shape memory properties of Ti-rich Ti52Ni23Cu25 (at.%) ribbon annealed at 450°C for 10 min and 1 h were investigated...
2259
Authors: Jie Shi, Wen Quan Cao, Han Dong
Abstract:In this study a C-Mn High Strength Low Alloy steel (HSLAs) was processed by quenching and austenite reverted transformation during annealing...
238
Authors: Mahmoud M. Tash
Chapter 2: Materials Science and Engineering
Abstract:The present study was undertaken to investigate the effect of thermo-mechanical treatment (TMT) on the microstructure and mechanical...
838
Authors: Ho Jun Bang, Ha Guk Jeong, Jong Beom Lee
B. Eco-Materials Processing and Design, Multifunctional Materials
Abstract:Mg alloy sheets exhibit the yield strength of 280 MPa and elongation of 18 % by rolling at 423 K. Elongation of Mg alloy sheets was improved...
190
Authors: Vasili Rubanik, Vladimir Klubovich, Vasili Rubanik
III. Controlling the Functional Properties of Shape Memory Alloys
Abstract:The results of studies on the influence of ultrasonic vibrations (UVs) on shape memory effect (SME) in NiTi alloys are presented. The...
406