Microstructure evolution of Ti-30Nb-(4Sn) alloys during classical and step-quench aging heat treatments

Autor(es)

Salvador, C. A. F. ; Opini, V. C. ; Lopes, E. S. N. ; Caram, R.

• Tipo de documento: Artigo Científico
• Fonte: MATERIALS SCIENCE AND TECHNOLOGY; v. 33, n. 4, p. 400-407, 2017.
• Citações Web of Science: 4

Resumo

Recent studies involving step-quench (SQ) heat treatments have shown that, unlike classical quench-and-aging (QA) heat treatments, SQ route can favour precipitation mechanisms that are strongly dependent on decomposition of the parent beta-phase. In this work, Ti-30Nb and Ti30Nb- 4Sn (wt-%) alloys were subjected to cold-working, recrystallisation and then to either classical or SQ heat treatments at 400 degrees C. Among QA samples,omega-phase is formed in both alloys during the heating ramp. By the SQ route, we found extensive isothermal omega-phase precipitation in Ti-30Nb during aging. On the other hand, a complete suppression of omega-phase in Ti-30Nb4Sn was observed, thus, alpha-phase precipitation could take place improving hardness while still preserving a low elastic modulus. (AU)

• Processo FAPESP: 12/10164-8 - Nucleação da fase alfa durante tratamentos isotérmicos em ligas de titânio biomédicas do sistema Ti-Nb e Ti-Nb-Sn
• Beneficiário: Camilo Augusto Fernandes Salvador
• Modalidade de apoio: Bolsas no Brasil - Mestrado