New role of α phase in the fracture behavior and fracture toughness of a β-type bio-titanium alloy
Source abstract
Abstract
The role of α precipitates formed during aging in the fracture toughness and fracture behavior of β-type bio-titanium alloy Ti–29Nb–13Ta–4.6Zr (TNTZ) was studied. Results showed that the fracture toughness of the TNTZ alloy aged at 723 K decreases to the minimum of 72.07–73.19 kJ·m−2 when the aging time is extended to 4–8 h and then gradually increases and reaches 144.89 kJ·m−2 after 72 h. The decrease in fracture toughness within the aging time of 4–8 h is caused by the large stress concentration at the tip of acicular a precipitates with a high aspect ratio and the preferential crack propagation along the inhomogeneous acicular a precipitates distributed in “V-shape” and “nearly perpendicular shape”. When the aging time is extended to 8–72 h, the precrack tip is uniformly blunted, and the crack is effectively deflected by a precipitates with multi long axis directions, more high homogeneity, low aspect ratio, and large number density. Analysis of the effect of a precipitates on the fracture behavior suggested that the number of long axis directions of a precipitates is the key controlling factor for the fracture behavior and fracture toughness of the TNTZ alloy aged for different times.
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Research context
OpenAlex topics: Titanium Alloys Microstructure and Properties · Orthopaedic implants and arthroplasty · Hydrogen embrittlement and corrosion behaviors in metals
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (27)
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