Paper Title:
High-Energy Ball Milling of Ni-Ti and Ni-Ti-Nb Powders
  Abstract

This work reports on the preparation of Ni-50Ti and Ni-40Ti-10Nb and Ni-30Ti- 20Nb (at.%) powders by high-energy ball milling and subsequent heat treatment. The milling process was carried out at room temperature in a planetary ball mill under Ar atmosphere. The as-milled powders were than heat-treated at 900oC for 1h under Ar atmosphere. X-ray diffraction (XRD), scanning electron microscopy (SEM), and microanalysis via energy dispersive spectroscopy (EDS) were used to characterize the milled and heat-treated powders. A metastable phase was initially formed in Ni-50Ti and Ni-40Ti-10Nb powders milled for 1h. Following the ball milling, the B2-NiTi compound was formed in these powder mixtures. The disordering of the B2-NiTi compound occurred owing the internal lattice strain after milling for 30h. Two phases were identified in Ni-50Ti and Ni-40Ti-10Nb powders milled for 60h: the metastable phase previously reported, and an amorphous phase. In Ni-30Ti-20Nb powders, it was noted the presence of an amorphous halo only. A structural relaxation of the B2-NiTi phase occurred in heat-treated Ni-50Ti, Ni-40Ti-10Nb, and Ni-30Ti-20Nb powders. A small amount of Ni3Ti and NiTi2 was also formed after heat treatment at 900oC for 1h, and an iron contamination lower than 2at.% was found.

  Info
Periodical
Materials Science Forum (Volumes 530-531)
Edited by
Lucio Salgado and Francisco Ambrozio Filho
Pages
211-216
DOI
10.4028/www.scientific.net/MSF.530-531.211
Citation
C.B. Martins, G. Silva, B. B. Fernandes, E. C. T. Ramos, D.A. Mardegan, A. S. Ramos, "High-Energy Ball Milling of Ni-Ti and Ni-Ti-Nb Powders", Materials Science Forum, Vols. 530-531, pp. 211-216, 2006
Online since
November 2006
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: M. Lutfy Öveçoğlu, Burak Özkal
89
Authors: Barbora Bártová, Jan Verner, Dalibor Vojtěch, A. Gemperle, M. Čerňanský
Abstract:The paper reports on a detailed investigation of microstructure and phase composition of rapidly solidified and annealed AlNi18.5 and...
219
Authors: Guo Long Tan
Abstract:Thermodynamically metastable tungsten carbide (W2C) nanoparticles have been synthesized by mechanochemical alloying (MCA) process. Mg was...
135
Authors: Jun Li Wang, Rui Dong Xu, Yu Zhi Zhang
Abstract:Ni-W-P-CeO2-SiO2 nanocomposites were pulse electrodeposited from the bath containing suspension of nano-sized CeO2 and SiO2 particles. The...
1317
Authors: Gui Wang, Wei Qi Wang, Yu Lan Yang, Damon Kent, Matthew S. Dargusch
Abstract:A metastable β titanium alloy, BTi-6554 (Ti-6Cr-5Mo-5V-4Al) has been developed for structural applications in aircraft because of its high...
847