Investigation into the thermal behaviour of the B2–NiAl intermetallic alloy produced by compaction and sintering of the elemental Ni and Al powders

Camagu, S.T.; Mathabathe, M.N.; Motaung, D.E.; Muller, T.F.G.; Arendse, Christopher J.; Bolokang, A.S.

doi:10.1016/j.vacuum.2019.108919

Cited by 20 publications

(6 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Although the powder metallurgy route for producing Ti-Al alloy is not shown in the equilibrium phase diagram, the mixed powder of titanium and aluminum alloy inherits the bottom→top direction. and solidification route [36,37]. The phase diagram confirms the stability of γ-TiAl at room temperature.…”

Section: Pa Powder Analysissupporting

confidence: 55%

“…According to the Ti-Al phase diagram (shown in Figure 4) [4], the Ti-48Al alloy starts to solidify at 1456 • C. With cooling (top→bottom analysis), the composition of Ti-48Al alloy gradually narrows. The mechanism is the thermodynamic feasibility of the melting and solidification route [36,37]. The phase diagram confirms the stability of γ-TiAl at room temperature.…”

Section: Pa Powder Analysismentioning

confidence: 62%

“…The microstructure of the T1350 sample was near-γ. Near-γ was composed of equiaxed γ particles and a small number of α2 particles distributed in the γ grain boundaries [35][36][37]. The microstructure of T1400 sample was duplex, as shown in Figure 6c.…”

Section: Phase and Microstructurementioning

confidence: 99%

See 2 more Smart Citations

Microstructure and Mechanical Properties of High Relative Density γ-TiAl Alloy Using Irregular Pre-Alloyed Powder

Yan

Yang

et al. 2021

Metals

View full text Add to dashboard Cite

Preparing high relative density γ-TiAl alloy by pressure-less sintering at low-cost has always been a challenge. Therefore, a new kind of non-spherical pre-alloyed TiAl powder was prepared by the reaction of TiH2 powder and Al powder at 800 °C to fabricate high-density Ti-48Al alloy via pressure-less sintering. The oxygen content was controlled to below 1800 ppm by using coarse Al powder (~120 μm). The sintered densities ranged from 92.1% to 97.5% with sintering temperature varying from 1300 °C to 1450 °C. The microstructure of the sintered compact was greatly influenced by the sintering temperature. The as-sintered samples had a near-γ structure at 1350 °C, a duplex structure at 1400 °C, and a nearly lamellar structure at 1450 °C. To achieve full densification, non-capsule hot isostatic pressing was performed on the 1350 °C and 1400 °C sintered samples. As a result, high compressive strengths of 2241 MPa and 1931MPa were obtained, which were higher than the existing Ti-48Al alloys.

show abstract

Section: Pa Powder Analysissupporting

confidence: 55%

Section: Pa Powder Analysismentioning

confidence: 62%

See 1 more Smart Citation

Microstructure and Mechanical Properties of High Relative Density γ-TiAl Alloy Using Irregular Pre-Alloyed Powder

Yan

Yang

et al. 2021

Metals

View full text Add to dashboard Cite

show abstract

“…% Ni [35], while, conversely, the AlNi intermetallic phase becomes the main phase at an Ni content of 45 wt. % and higher [36].…”

Section: Introductionmentioning

confidence: 90%

Al–Al3Ni In Situ Composite Formation by Wire-Feed Electron-Beam Additive Manufacturing

et al. 2023

View full text Add to dashboard Cite

The regularities of microstructure formation in samples of multiphase composites obtained by additive electron beam manufacturing on the basis of aluminum alloy ER4043 and nickel superalloy Udimet-500 have been studied. The results of the structure study show that a multicomponent structure is formed in the samples with the presence of Cr23C6 carbides, solid solutions based on aluminum -Al or silicon -Si, eutectics along the boundaries of dendrites, intermetallic phases Al3Ni, AlNi3, Al75Co22Ni3, and Al5Co, as well as carbides of complex composition AlCCr, Al8SiC7, of a different morphology. The formation of a number of intermetallic phases present in local areas of the samples was also distinguished. A large amount of solid phases leads to the formation of a material with high hardness and low ductility. The fracture of composite specimens under tension and compression is brittle, without revealing the stage of plastic flow. Tensile strength values are significantly reduced from the initial 142–164 MPa to 55–123 MPa. In compression, the tensile strength values increase to 490–570 MPa and 905–1200 MPa with the introduction of 5% and 10% nickel superalloy, respectively. An increase in the hardness and compressive strength of the surface layers results in an increase in the wear resistance of the specimens and a decrease in the coefficient of friction.

show abstract

“…Our results confirm the b-Ti phase in Tie13Cu and Tie13Cu-4.5Ni sintered samples. It is possible that cold pressing prior to sintering induced surface deformation that influenced the b-phase formation during sintering [50], hence, this phase is not formed in cast TieCu alloy [28]. At 20 wt % Cu alloying, only the Ti 2 Cu precipitated from the a-Ti grains [28] while~5 wt% Cu induces the b-phase on alloys produced under powder processing [48].…”

Section: Xrd Pattern Analysismentioning

confidence: 99%

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

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Investigation into the thermal behaviour of the B2–NiAl intermetallic alloy produced by compaction and sintering of the elemental Ni and Al powders

Cited by 20 publications

References 46 publications

Microstructure and Mechanical Properties of High Relative Density γ-TiAl Alloy Using Irregular Pre-Alloyed Powder

Microstructure and Mechanical Properties of High Relative Density γ-TiAl Alloy Using Irregular Pre-Alloyed Powder

Al–Al3Ni In Situ Composite Formation by Wire-Feed Electron-Beam Additive Manufacturing

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

Contact Info

Product

Resources

About