pela orientação, amizade e confiança depositada. Aos amigos do laboratório de Materiais Magnéticos do Centro de Ciência e Tecnologia de Materiais do IPEN pelo apoio técnico, moral e incentivo na realização deste trabalho. À Dra. Ana Helena Bressiani responsável pelo laboratório de Microscopia & Microanálise pelas análises de metalografia. Aos Dr. Luís Gallego e Dr. Nelson Batista de Lima pelas análises de raios X. Ao Dr. José Roberto Martinelli responsável pelo laboratório de Vidros e Compósitos Cerâmicos, pelas análises de composição por fluorescência de raios X e tamanho de partículas. À Dra. Margarida Juri Saeki da Universidade Estadual Paulista-UNESP/Botucatu pelos ensaios eletroquímicos. Aos Técnicos de laboratório do CCTM pela dedicação nas análises solicitadas e pelo suporte. À CNPQ e a FAPESP pelo apoio financeiro. Ao instituto de Pesquisas Energéticas e Nucleares-IPEN/ CNEN-SP, pela oportunidade de realização deste trabalho. A todos os colegas dos demais Centros do IPEN e da Universidade de São Paulo (USP) que direta ou indiretamente ajudaram na realização deste trabalho.
Ti-13Nb-13Zr alloy produced via powder metallurgy was submitted to heat treatment under various conditions and the effects on microstructure and elastic modulus were investigated. Heat treatment was performed using temperatures above and below α/β transus combined with different cooling rates – furnace cooling and water quenching. Microstructure and phases were analyzed employing scanning electron microscopy and X-ray diffraction. Elastic Modulus was determined using a dynamic mechanical analyzer (DMA). The results indicated that α phase precipitation and elastic modulus values increased after heat treatment performed using temperature below α/β transus. However, when it was performed above α/β transus and using higher cooling rate, a decrease in elastic modulus was observed despite higher α phase precipitation, indicating that the microstructural modifications observed via SEM, due to the presence of martensitic α phase, influenced on elastic modulus values.
In this present work Ti-13Nb-13Zr alloy was produced by PM using planetary ball mill with zirconium oxide grinding bowl and balls to reduce contamination. The effect of milling time upon microstructure and microhardness was studied. Powders have been produced by hydrogenation of Ti, Nb and Zr at 1MPa. Milling speed was 200 rpm during 90 to 360 min. Sintering was carried out at 1150°C during 10h. Powder size distribution was analyzed using CILAS equipment and chemically characterized by X-Ray Fluorescence (XRF). Microhardness was determined by means of a Vickers microhardness tester. Microstructure and phases were analyzed employing scanning electron microscopy (SEM) and X-Ray diffraction.
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