Effect of Homogenization Time and Cooling Rate on Martensitic Transformations in Ti-57.5%wtNi Alloy

P. Movahed; Ali Shokuhfar; H. Kaffash; A. Etaati; H. Bolvardi; H. Tavakoli

doi:10.4028/www.scientific.net/DDF.297-301.339

Paper Titles

Diffusion in Electrodes Used for Resistance Spot Welding of Galvannealed Steel
p.300

Kinetic Monte Carlo (KMC) Simulation of GaAs (001) β₂ (2x4) Reconstructed Surface and Characterization
p.308

Effects of Nickel on Interface Morphology during Oxidation of Fe-Cu-Ni Alloys
p.318

Thermal Properties and Crystallization Behavior of Co67Fe4Cr7Si8B14 Amorphous Alloy
p.330

Effect of Homogenization Time and Cooling Rate on Martensitic Transformations in Ti-57.5%wtNi Alloy
p.339

The Effects of Homogenization Time and Cooling Environment on Microstructure and Transformation Temperatures of Ni-42.5wt%Ti-7.5wt%Cu Alloy
p.344

The Consideration of Splendid Increasing Trend of Green Fuel H₂ Production with the Help of Nanofine Materials
p.351

Analysis of the Recrystallization of Cold-Rolled Copper after Isothermal Annealing Using Electron Backscattered Diffraction Patterns
p.359

Mechanical Performance of the Annealed NiTi Shape Memory Alloy Coating onto 316L Stainless Bio-Steel
p.365

HomeDefect and Diffusion ForumDefect and Diffusion Forum Vols. 297-301Effect of Homogenization Time and Cooling Rate on...

Effect of Homogenization Time and Cooling Rate on Martensitic Transformations in Ti-57.5%wtNi Alloy

Abstract:

NiTi alloys containing more than 55%wt nickel undergo precipitation of Ni4Ti3, Ni3Ti2, and Ni3Ti phases during various heat treatments which could have a great effect on the chemical composition of the matrix and behavior of alloy. In this investigation, a NiTi alloy with Ti-57.5%wt nickel content, produced by vacuum induction melting in a graphite crucible, were subjected to the homogenization heat treatments in 1100oC and for various time periods (0.5, 1, 2, and 4 hours). The subsequent cooling was conducted in different cooling media (furnace and air) in order to examine the effect of cooling rate. Microstructural investigations show Ni4Ti3 particles with bimodal size distribution in furnace cooling. Differential scanning calorimetry demonstrates the correlation between homogenization time and transformation temperatures of the alloy.

You might also be interested in these eBooks

View Preview

Info:

Periodical:

Defect and Diffusion Forum (Volumes 297-301)

Pages:

339-343

DOI:

https://doi.org/10.4028/www.scientific.net/DDF.297-301.339

Citation:

Cite this paper

Online since:

April 2010

Authors:

P. Movahed, Ali Shokuhfar, H. Kaffash, A. Etaati, H. Bolvardi, H. Tavakoli

Keywords:

DSC Curve, Homogenization, Martensitic Transformation (MT), Ni-Rich NiTi

Export:

RIS, BibTeX

Price:

Permissions CCC:

Request Permissions

Permissions PLS:

Request Permissions

Сopyright:

Citation:

References

[1] J. Khalil-Allafi , A. Dlouhy, G. Eggeler: Acta Materialia Vol. 50 (2002), p.4255.

DOI: 10.1016/s1359-6454(02)00257-4

Google Scholar

[2] J. Khalil Allafi , X. Ren , G. Eggeler: Acta Materialia Vol. 50 (2002), p.793.

Google Scholar

[3] M.C. Carroll , Ch. Somsen, G. Eggeler: Scripta Materialia Vol. 50 (2004), p.187.

Google Scholar

[4] V.I. Zel'dovich, G.A. Sobyanina, V.G. Pushin: Scripta Materialia Vol. 37 (1997), p.79.

Google Scholar

[5] L. Bataillard, J. -E. Bidaux, R. Gotthardt: Philos. Mag. Vol. 78 (1998), p.327.

Google Scholar

[6] F. Jiang , L. Li, Y. Zheng , H. Yang , Y. Liu: Intermetallics Vol. 16 (2008), p.394.

Google Scholar

[7] L.J. Chiang , C.H. Li , Y.F. Hsu, W.H. Wang: J. Alloys Compounds Vol. 458 (2008), p.231.

Google Scholar