Effect of Fe Addition on Microstructure and Properties of Powder Metallurgy Ti35Nb10Ta Alloy

[EN] The high contents of noble refractory elements of Ti35Nb10Ta (wt.%) alloy difficult the diffusion of them. The stabilization of the ß phase can be favored by the addition of Fe in ß-Ti alloys. In this work, elemental powders mixture with different contents of Fe (0, 1.5, 3.0 and 4.5 wt.%) were used. These powders were compacted with uniaxial pressure of 600MPa and sintered at 1250°C in high vacuum. The porosity obtained after sintering shows a dependence on the particle size of iron used, and homogeneous pores distribution was observed. The analyzed microstructure mainly corresponds to ß-Ti phase, with small fractions of ¿ phase appearing at grain boundaries, which decreases with increasing of Fe content. The microstructure showed good compositional homogeneity of Fe and Ta and some lack of diffusion related to large amount of undissolved Nb particles. Addition of Fe lead to a decrease in bending strength of Ti35Nb10Ta alloy.Authors would like to thank the Universitat Politècnica de València (UPV) for the financial support by Researcher Training Program. The Spanish Ministry of Economy and Competitiveness under the Research Project MAT2014-53764-C3-1-R and Generalitat Valenciana for the financial support. European Commission due to FEDER founds to acquire investigation equipment and the Electron Microscopy Service (SME) of the Universitat Politècnica de València (UPV).Amigó Mata, A.; Afonso, C.; Amigó, V. (2017). Effect of Fe Addition on Microstructure and Properties of Powder Metallurgy Ti35Nb10Ta Alloy. Materials Science Forum. 899:206-211. doi:10.4028/www.scientific.net/MSF.899.206S20621189

Ultrafine eutectic coatings from Fe-Nb-B powder using laser cladding

In this paper, a laser cladding process was proposed to obtain ultrafine eutectic Fe-Nb-B alloy coatings on AISI 1020 steel substrate in which the power and scanning speed were defined. The laser cladding process can be used as a rapid solidification processing route to produce single laser tracks and coatings (overlapped tracks) with pre-placed powders deposited onto a mild steel substrate in order to obtain a minimal dilution between the coating/substrate. This research aims to produce a coating of Fe74.25Nb8.25B17.5 (at.%) alloy over the AISI 1020 steel substrate by laser cladding using a pre-placed powder method to investigate the parameters on coating production, dilution, microstructure, and properties. The final goal is to find an appropriate processing parameter range to obtain coatings with high hardness and possibly good wear resistance. The microstructure and behavior of powder, cladding layers and coatings were examined by X-ray Diffractometry, Differential Scanning Calorimetry, Scanning Electron Microscopy and Transmission Electron Microscopy of selected samples prepared with a Dual Beam microscope using a Focused Ion Beam. For the processing conditions used, the coatings showed larger exothermic crystallization peaks. The results of microhardness from coatings showed values of hardness over 700 HV160COORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIOR - CAPESFUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE SÃO PAULO - FAPESP2013/05987-8; 2015/19978-

In-situ Crystallization Of Amorphous Fe73-xnbxal4si3 B20 Alloys Through Synchrotron Radiation

In the present work Fe73-xNbxAl4Si3 B20 (x = 5, 10) alloys have been processed by melt-spinning with the aim of studying the crystallization sequence through annealing in suitable temperatures. Melt-spun ribbons were characterized by differential scanning calorimetry (DSC), X-ray diffractometry (XRD) through Cu-Kα (λ = 1.54 Å) and synchrotron radiation (λ = 1.77 Å) and transmission electron microscopy (TEM). Soft magnetic properties were measured through the hysteresis loop tracer. In-situ XRD through synchrotron radiation was very accurate in phase identification. Fe73-xNbxAl4Si3 B20 (x = 5, 10) alloys showed the possibility of forming ferromagnetic amorphous alloys composed of commercial Fe-based master alloys with fine nanocrystalline structure and good soft magnetic properties. © 2006 Elsevier B.V. All rights reserved.35232-3534043409McHenry, E.M., Willard, M.A., Laughlin, D.E., (1999) Progress Mater. Sci., 44, p. 291Makino, A., Inoue, A., Mizushima, T., (2000) Mater. Trans. JIM, 41, p. 1471Inoue, A., Makino, A., Mizushima, T., (2000) J. Magn. Magn. Mater., 215-216, p. 246Ma, G.L., Wang, L., Zhang, T., Inoue, A., (1999) Mater. Res. Bull., 34, p. 915Inoue, A., Shen, B., (2002) Mater. Tran. JIM, 43, p. 766Shen, T.D., Schwarz, R.B., (1999) Appl. Phys. Lett., 75, p. 49Luciano, B.A., Guimarães, M.K.A., de Castro, W.B., (2002) J. Metastable Nan. Mater., 14, p. 133Luciano, B.A., Kiminami, C.S., (1997) Mater. Sci. Eng. A, 226-228, p. 1079May, J.E., Oliveira, M.F., Kuri, S.E., (2003) Mater. Sci. Eng. A, A361, p. 179Maniar, G.N., Ddebold, T.A., (1998) Adv. Mater. Proc., 153, p. 57Lisboa, R.D.S., Kiminami, C.S., (2002) J. Non-Cryst. Solids, 304, p. 36Souza, C.A.C., May, J.E., Carlos, I.A., Oliveira, M.F., Kuri, S.E., Kiminami, C.S., (2002) J. Non-Cryst. Solids, 304, p. 210Oliveira, M.F., May, J.E., Botta Filho, W.J., Bolfarini, C., Kiminami, C.S., (2003) J. Metastable Nan. Mater., 15-16, p. 149Bassim, N.D., Kiminami, C.S., Kaufman, M.J., Oliveira, M.F., Perdigão, M.N.R.V., Botta Filho, W.J., (2001) Mater. Sci. Eng. A, 304-306, p. 332Oliveira, M.F., Kiminami, C.S., Botta, W.J., (2001) Mater. Sci. Eng. A, 304-306, p. 65Cullity, B.D., (1967) Elements of X-Ray Diffraction, , Addison Wesley, USAAfonso, C.R.M., Kaufman, M.J., Bolfarini, C., Botta Filho, W.J., Kiminami, C.S., (2004) J. Metastable Nan. Mater., 20-21, p. 175Afonso, C.R.M., Kaufman, M.J., Bolfarini, C., Botta Filho, W.J., Kiminami, C.S., (2004) Mater. Sci. Eng. A, 375-377, p. 571Afonso, C.R.M., Bolfarini, C., Botta, W.J., Kiminami, C.S., (2004) J. Metastable Nan. Mater., 22, p. 93Afonso, C.R.M., Bolfarini, C., Botta Filho, W.J., Kiminami, C.S., (2005) J. Metastable Nan. Mater., 24-25, p. 34