Relation between Mechanical Milling Parameters in Phase Transformation and Oxygen Content in Ti-Nb-Mo Powders for Posterior Sintering

Author(s)

Gouvea, Eber de Santi ; Rossi, Mariana Correa ; Escuder, Angel Vicente ; Afonso, Conrado Ramos Moreira ; Borras, Vicente Amigo

• Document type: Journal article
• Source: METALS; v. 12, n. 8, p. 19-pg., 2022-08-01.

Abstract

The influence of open vessels during milling for 12, 24, 40 and 60 h on microstructure homogeneity and oxygen content effect in the beta Ti-Nb-Mo system microstructure were studied. The beta phase increased with longer milling times and the strain hardening on particles was verified at 60 h when agglomeration was greater and was also noticed after 40 h in the continuous mode. Oxygen content dropped slightly until 40 h and increased after 60 h, a result linked with the observed hardening. For 40 h in the continuous mode, the oxygen content was noted near 12 h, 24 h and 40 h with high hardness values. For the sintered parts, the alpha phase and oxygen content significantly increased in all samples. Microhardness-sintered samples decreased compared to sample powders due to grain growth during the sintering. Bending strength was higher at 60 h with more oxygen and alpha phase content. After 40 h in the continuous mode, more suitable mechanical properties were reached because hardness and bending strength were closer to bone tissue, which was associated with strain hardening and a small crystallite size. (AU)

• FAPESP's process: 21/03865-9 - Influence of surface modifications on bioactivity and (tribo) corrosion of beta Ti-Nb-(Zr) alloys with low elastic modulus for application as implant
• Grantee: Mariana Correa Rossi
• Support Opportunities: Scholarships in Brazil - Post-Doctoral