Correlations between aging heat treatment, ω phase precipitation and mechanical properties of a cast Ti–Nb alloy

✍ Scribed by A. Cremasco; P.N. Andrade; R.J. Contieri; E.S.N. Lopes; C.R.M. Afonso; R. Caram

• Publisher: Elsevier Science
• Year: 2011
• Weight: 881 KB
• Volume: 32
• Category: Article
• ISSN: 0261-3069
• DOI: 10.1016/j.matdes.2010.11.012

✦ Synopsis

Ti-Nb alloys were arc melted in a water-cooled copper hearth in an inert atmosphere. After preparation, the samples were centrifugally cast in copper molds, and rapidly cooled, resulting in a martensitic microstructure. They were then aged at different temperatures. The microstructural characterization of this material suggested that martensite decomposition occurred, leading to precipitation of a, b and x phases. Aging at higher temperatures led to x phase decay. Mechanical characterization indicated that the heat treatment enhanced the strength and ductility of the alloys. Correlations between heat treatment, x precipitation and mechanical behavior are discussed.