Mechanical properties of porous metastable beta Ti-Nb-Zr alloys for biomedical applications

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Proceedings titleJournal of alloys and compounds
ConferenceICOMAT 2011: International Conference on Martensitic Transformations, September 4-9, 2011, Osaka, Japan, 2011-09-04
IssueSupplement 1
SubjectMetals and alloys; Powder metallurgy; Sintering; Mechanical properties; Shape memory
AbstractFor this study, Ti–(20–22)Nb–(5–6)Zr (at percent) ingots were manufactured by vacuum and argon arc melting. The obtained ingots were divided into two batches: the first subjected to cold rolling (CR) from 30 to 85 percent of thickness reduction, and subsequent annealing in the 450–600 °C temperature range (1 h). Regardless of the CR intensity, Ti–Nb–Zr samples subjected to 600 °C annealing showed the highest fatigue resistance during room-temperature cumulative cycling due to the stress-induced martensitic transformation occurring in the polygonized dislocation substructure (average subgrain size ∼ 100 nm). The second batch was atomized to produce 100-μm-size powders in order to manufacture open-cell porous material (cell size vary from 136 to 561 μm) of 46 percent porosity by means of powder metallurgy using a polymer-based foaming process. Tensile, compression and bending testing were performed at RT on foam samples annealed at 450–600 °C (1 h). Results indicated that Young's modulus of Ti–Nb–Zr foams significantly decreases as compared to the as-sintered material: when annealing temperature increases from 450 to 600 °C, Young's modulus decreases from 10 ± 2 GPa to 6 ± 1 GPa. Under the same testing conditions, Ti-CP foams produced by the same technology and having similar porosity remain fairly insensible to post-sintering annealing.
Publication date
AffiliationNRC Industrial Materials Institute; National Research Council Canada
Peer reviewedYes
NRC number54387
NPARC number19262898
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Record identifier8e4a22b1-1d73-4f94-98b0-d9e90fa30567
Record created2012-01-13
Record modified2016-05-09
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