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Type: Artigo
Title: Orthorhombic martensite formation upon aging in a Ti-30Nb-4Sn alloy
Author: Salvador, Camilo A.F.
Lopes, Eder S.N.
Ospina, Carlos A.
Caram, Rubens
Abstract: The characteristics of orthorhombic martensite (α″) formed by step-quenching in a Ti-30Nb-4Sn (wt%) alloy have been investigated by transmission electron microscopy (TEM) and X-ray diffraction (XRD). According to literature, α″ lattice parameters depend mainly on the composition of the parent β phase. In this study, samples subjected to step quenching heat treatment presented α″ phase formation in the proximity of α phase laths, driven by two combined factors: solute rejection and lattice strain. Our results indicate that as the aging is prolonged, α″ becomes richer in solute content, which makes it more similar to the parent β phase. An average 2.55% lattice strain along [110]β directions was found to be necessary in order to obtain α″ from the β phase after 24 h of aging at 400 °C, followed by water-quenching. The initial lattice strain along the same direction was estimated at approximately 3.60% with zero aging time. The precipitation of the α phase does not inhibit a solute rich α″ phase formation
Subject: Ligas (Metalurgia)
Country: Países Baixos
Editor: Elsevier
Rights: Fechado
Identifier DOI: 10.1016/j.matchemphys.2016.08.023
Date Issue: 2016
Appears in Collections:FEM - Artigos e Outros Documentos

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