Influence of oxygen addition and aging on the microstructure and mechanical properties of a beta-Ti-29Nb-13Ta-4Mo alloy

Autor(es)

Pinotti, Vitor Eduardo ^[1] ; Plaine, Athos Henrique ^[2] ; da Silva, Murillo Romero ^{[3, 1]} ; Bolfarini, Claudemiro ^{[3, 1]}

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Grad Program Mat Sci & Engn, Rodovia Washington Luis Km 235, BR-13565905 Sao Carlos, SP - Brazil

^[2] Univ Estado Santa Catarina, Dept Mech Engn, BR-89223100 Joinville, SC - Brazil

^[3] Univ Fed Sao Carlos, Dept Mat Engn, Rodovia Washington Luis Km 235, BR-13565905 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING; v. 819, JUL 5 2021.
• Citações Web of Science: 1

Resumo

In this work, theoretical composition design and thermo-mechanical treatments were combined in order to improve the mechanical compatibility of a metastable beta-type Ti-29Nb-13Ta-4Mo (wt%) alloy. Also, the influence of Mo and O alloying elements were investigated. By applying cold rolling and low temperature aging (673K during 20 and 100 min) different behaviours in microstructure and mechanical properties were identified. Alloys with Ultimate Tensile strength-UTS = 854 MPa and Elastic Modulus = 65 GPa were successfully fabricated. The microstructure responsible for that behaviour consisted mainly of beta-matrix and omega-precipitation obtained via cold rolling plus short-time aging at low temperature, i.e. 673K for 20 min. These precipitates increase the strength of the material by hindering the motion of dislocations while the beta-matrix with relatively high content of beta-stabilizers (such, Mo) gives rise to the observed low elastic modulus. By extending aging time (100 min), a higher UTS is reached, but a slight increase in Elastic Modulus is also observed. The addition of oxygen increased mechanical and physical properties by favouring omega-phase formation. Whereas, Mo content increased beta-stability, and in solution treated condition, only beta-phase could be observed. (AU)

• Processo FAPESP: 16/17502-7 - Desenvolvimento e caracterização de novas ligas de titânio para aplicação em endopróteses vasculares (stents)
• Beneficiário: Athos Henrique Plaine
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado