Effect of Nb content on phase transformation, microstructure of the sintered and heat-treated Ti (10–25) wt.% Nb alloys

Mathebula, Confidence Lethabo; Matizamhuka, Wallace; Bolokang, A.S.

doi:10.1007/s00170-020-05385-9

Cited by 3 publications

(1 citation statement)

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“…This behaviour has been observed in pure Ti powder even after been subjected to mechanical deformation [51]. Moreover, it is possible that the high Cu content of 13 wt% acted like the other b-stabilizing elements such niobium (Nb) and trapped the b-phase in Ti alloys [52]. Another possible reason for these differences between cast and PM TieCu alloys could be the differences in the cooling rates the alloys experience from the beta-phase field.…”

Section: Xrd Pattern Analysismentioning

confidence: 92%

A comparison of the microstructures, thermal and mechanical properties of pressed and sintered Ti–Cu, Ti–Ni and Ti–Cu–Ni alloys intended for dental applications

Machio

Mathabathe

Bolokang

2020

Journal of Alloys and Compounds

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The effect of Ni and Cu on the a/b phase transformation temperature, possible retention of the b-phase, and mechanical properties of Ti, Tie13Cu, Tie4.5Ni and Tie13Cue4.5Ni (compositions in wt. %) alloys were investigated. The alloys were developed using the conventional uniaxial cold press and sintering technique. The thermal properties of the sintered alloys were traced by the differential scanning calorimetry (DSC) analysis. The x-ray diffraction (XRD) and electron backscatter diffraction (EBSD) analysis determined phase composition, crystal structures and grain orientations. It has emerged that the Ti e13Cu and Tie13Cue4.5Ni retained the b-Ti phase. The mechanical properties were evaluated under tension with Tie13Cu and Tie4.5Ni possessing high ultimate tensile strength (UTS) and percentage elongation (%El) than the Tie13Cu-4.5Ni alloy. Although all the alloys have revealed the presence of porosity, its effect on mechanical properties was more on the Tie13Cue4.5Ni alloy. While the mechanical properties of Tie13Cu-4.5Ni alloy were inferior due to extensive porosity, those of Ti, Tie13Cu and Ti e4.5Ni allow them to be classified as Type 3 and Type 4 dental alloys, respectively, proving that the conventional powder metallurgy process has potential to be used as a processing technique for TieCubased dental alloys.

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Section: Xrd Pattern Analysismentioning

confidence: 92%