Rapid solidification and phase stability evaluation of Ti-Si-B alloys

Autor(es)

Candioto, K. C. G. ^{[1, 2]} ; Nunes, C. A. ^[1] ; Coelho, G. C. ^{[3, 1]} ; Suzuki, P. A. ^[1] ; Gabriel, S. B. ^[3]

Afiliação do(s) autor(es)

^[1] USP Univ Sao Paulo EEL, Lorena, SP - Brazil

^[2] AEDB Assoc Educ Dom Bosco, Resende, RJ - Brazil

^[3] Univ Volta Redonda, UniFoa Ctr, NUPE, Volta Redonda, RJ - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Alloys and Compounds; v. 509, n. 17, p. 5263-5268, APR 28 2011.
• Citações Web of Science: 5

Resumo

Ti-rich Ti-Si-B alloys can be considered for structural applications at high temperatures (max. 700 degrees C), however, phase equilibria data is reported only for T = 1250 degrees C. Thus, in this work the phase stability of this system has been evaluated at 700 degrees C. In order to attain equilibrium conditions in shorter time, rapid solidified samples have been prepared and carefully characterized. The microstructural characterization of the produced materials were based on X-ray diffraction (XRD), scanning electron microscopy (SEM-BSE), high resolution transmission electron microscopy (HRTEM), High Temperature X-ray diffraction with Synchrotron radiation (XRDSR) and Differential Scanning Calorimetry (DSC). Amorphous and amorphous with embedded nanocrystals have been observed after rapid solidification from specific alloy compositions. The values of the crystallization temperature (Tx) of the alloys were in the 509-647 degrees C temperature range. After Differential Scanning Calorimetry and High Temperature X-ray Diffraction with Synchrotron radiation, the alloys showed crystalline and basically formed by two or three of the following phases: alpha Ti, Ti(6)Si(2)B; Ti(5)Si(3); Ti(3)Si and TiB. It has been shown the stability of the Ti(3)Si and Ti(6)Si(2)B phases at 700 degrees C and the proposition of an isothermal section at this temperature. (C) 2011 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 01/09529-7 - Utilização de técnica de solidificação rápida para estudos de estabilidade de fases em ligas do sistema Ti-B-Si
• Beneficiário: Carlos Angelo Nunes
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 07/05206-5 - Estudo experimental do sistema Hf-Si-B
• Beneficiário: Carlos Angelo Nunes
• Modalidade de apoio: Auxílio à Pesquisa - Regular