The role of twinning and nano-crystalline omega phase on the fatigue behavior of the metastable beta Ti-15Mo alloy

Autor(es)

Campanelli, Leonardo Contri ^[1] ; Coury, Francisco Gil ^[2] ; Guo, Yaofeng ^[2] ; Carvalho Pereira da Silva, Paulo Sergio ^[1] ; Kaufman, Michael Joseph ^[2] ; Bolfarini, Claudemiro ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Dept Mat Engn, Rod Washington Luiz Km 235, BR-13565905 Sao Carlos, SP - Brazil

^[2] Colorado Sch Mines, Dept Met & Mat Engn, 1500 Illinois St, Golden, CO 80401 - USA

• Tipo de documento: Artigo Científico
• Fonte: MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING; v. 729, p. 323-330, JUN 27 2018.
• Citações Web of Science: 5

Resumo

This work evaluated in depth the fatigue and fracture behavior of the metastable beta Ti-15Mo alloy considering the presence of deformation twins and athermal nano-crystalline omega phase in the microstructure. Regardless of the microstructural condition studied, the as-received and the solution treated and quenched materials, omega phase remained unchanged, guaranteeing the static mechanical properties at acceptable levels. The mechanism of fatigue fracture was related to the existence of twins and maximum shear stress planes near the direction of screw dislocation motion in the BCC structure. The significant amount of deformation twins in the initial microstructure did not alter the fatigue limit, because the solution treated and quenched material unexpectedly developed twins during the fatigue test. (AU)

• Processo FAPESP: 16/12995-5 - Fadiga de uma liga beta metaestável de titânio para aplicação como biomaterial
• Beneficiário: Leonardo Contri Campanelli
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado