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Open AccessArticle

Mechanical Alloying and Hot Pressing of Ti-Zr-Si-B Powder Mixtures

1
Instituto de Ciência e Tecnologia, Universidade Federal de Alfenas, Rodovia José Aurélio Vilela, 11999, Poços de Caldas, MG 37715-400, Brazil
2
Departamento de Engenharia de Materiais, Escola de Engenharia de Lorena, Universidade de São Paulo, Polo Urbo Industrial, Gleba AI-6, Lorena, SP 12602-810, Brazil
3
Centro de Ciências e Tecnologia, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Avenida Alberto Lamengo, 200, Parque Califórnia, Campos de Goytacazes, RJ 28013-602, Brazil
4
Faculdade de Tecnologia de Resende, Universidade do Estado do Rio de Janeiro, Rodovia Presidente Dutra km 298, Polo Industrial de Resende, Resende, RJ 27537-000, Brazil
*
Author to whom correspondence should be addressed.
Metals 2018, 8(2), 82; https://doi.org/10.3390/met8020082
Received: 12 December 2017 / Revised: 2 January 2018 / Accepted: 17 January 2018 / Published: 23 January 2018
(This article belongs to the Special Issue Mechanical Alloying 2018)
This work discusses microstructure evolution during ball milling and hot pressing of Ti-xZr-10Si-5B (x = 2 and 5 at. %) and Ti-xZr-20Si-10B (x = 5, 7, 10, 15 and 20 at. %) powder mixtures. Mechanical alloying was carried out in a ball mill using stainless steel balls and vials, 300 rpm and a ball-to-powder ratio of 10:1. Powders milled for 600 min were then hot-pressed (25 MPa) under vacuum at 1100 °C for 60 min. As-milled and hot-pressed samples were evaluated by X-ray diffraction (XRD), scanning electron microscopy (SEM), differential scanning calorimetry (DSC), and energy dispersive spectrometry (EDS). Peaks of Si and Zr disappeared in powders milled for 60 and 180 min, respectively, while the lattice parameters and cell volume of α-Ti were varied during ball milling up to 300 min indicating that supersaturated solid solutions were achieved. Ti6Si2B dissolving up to 10 at. % Zr was found in microstructure of hot-pressed Ti-xZr-10Si-5B (x = 2 and 5 at. %) and Ti-xZr-20Si-10B (x = 2, 5, 7 and 10 at. %) alloys. The amount of TiB and Ti5Si3 was preferentially increased whereas the Ti3Si formed in microstructure of the hot-pressed Ti-15Zr-20Si-5B and Ti-20Zr-20Si-10B alloys. View Full-Text
Keywords: mechanical alloying; hot pressing; phase transformation; titanium alloy; Ti6Si2B; biomaterial; high temperature mechanical alloying; hot pressing; phase transformation; titanium alloy; Ti6Si2B; biomaterial; high temperature
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MDPI and ACS Style

Rossi Bertoli, I.; Moreira Ferreira, L.; Xavier de Freitas, B.; Angelo Nunes, C.; Saraiva Ramos, A.; Filgueira, M.; Dos Santos, C.; Coaglia Trindade Ramos, E. Mechanical Alloying and Hot Pressing of Ti-Zr-Si-B Powder Mixtures. Metals 2018, 8, 82.

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