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

Camagu, Sigqibo TMathabathe, Maria NMotaung, David EMuller, TFGArendse, CJBolokang, Amogelang S2023-03-242023-03-242019-11Camagu, S.T., Mathabathe, M.N., Motaung, D.E., Muller, T., Arendse, C. & Bolokang, A.S. 2019. Investigation into the thermal behaviour of the B2–NiAl intermetallic alloy produced by compaction and sintering of the elemental Ni and Al powders. Vacuum. http://hdl.handle.net/10204/126980042-207Xhttps://doi.org/10.1016/j.vacuum.2019.108919http://hdl.handle.net/10204/12698A cubic B2–NiAl alloy was synthesized by mixing of elemental Ni and Al powders followed by cold compacting and sintering of some samples at 750 °C and other samples at 1300 °C. The alloys sintered at 1300 °C exhibited a brittle B2–NiAl structure easily crushable into powder, while the 750 °C sintered alloys were not nearly as brittle. Electron Backscatter Diffraction (EBSD) results show that the B2–NiAl alloy sintered at 750 °C for a longer time (120 h) has larger grain size associated with the <111>-oriented grains encountering high mobility boundaries than the alloy sintered at 750 °C for a shorter time (48 h). Samples morphologies were analyzed using the Scanning Electron Microscope (SEM). Structural development of the alloy was studied via the x-ray diffraction (XRD) technique. The B2–NiAl intermetallic developed a thin scale of stable Al2O3 alloy due to oxidation in air at 750 °C for 120 h. As a result, further oxidation on the sample's surface was restricted, except the traces of Al2O3 formed via intergranular oxidation transformed into a metastable monoclinic oxynitride phase due to nitrogen (N) contamination.AbstractenB2-NiAlBrittleCubicElectron Backscatter DiffractionEBSDIntermetallicChemicalsInvestigation into the thermal behaviour of the B2–NiAl intermetallic alloy produced by compaction and sintering of the elemental Ni and Al powdersArticleCamagu, S. T., Mathabathe, M. N., Motaung, D. E., Muller, T., Arendse, C., & Bolokang, A. S. (2019). Investigation into the thermal behaviour of the B2–NiAl intermetallic alloy produced by compaction and sintering of the elemental Ni and Al powders. Vacuum, http://hdl.handle.net/10204/12698Camagu, Sigqibo T, Maria N Mathabathe, David E Motaung, TFG Muller, CJ Arendse, and Amogelang S Bolokang "Investigation into the thermal behaviour of the B2–NiAl intermetallic alloy produced by compaction and sintering of the elemental Ni and Al powders." Vacuum (2019) http://hdl.handle.net/10204/12698Camagu ST, Mathabathe MN, Motaung DE, Muller T, Arendse C, Bolokang AS. Investigation into the thermal behaviour of the B2–NiAl intermetallic alloy produced by compaction and sintering of the elemental Ni and Al powders. Vacuum. 2019; http://hdl.handle.net/10204/12698.TY - Article AU - Camagu, Sigqibo T AU - Mathabathe, Maria N AU - Motaung, David E AU - Muller, TFG AU - Arendse, CJ AU - Bolokang, Amogelang S AB - A cubic B2–NiAl alloy was synthesized by mixing of elemental Ni and Al powders followed by cold compacting and sintering of some samples at 750 °C and other samples at 1300 °C. The alloys sintered at 1300 °C exhibited a brittle B2–NiAl structure easily crushable into powder, while the 750 °C sintered alloys were not nearly as brittle. Electron Backscatter Diffraction (EBSD) results show that the B2–NiAl alloy sintered at 750 °C for a longer time (120 h) has larger grain size associated with the <111>-oriented grains encountering high mobility boundaries than the alloy sintered at 750 °C for a shorter time (48 h). Samples morphologies were analyzed using the Scanning Electron Microscope (SEM). Structural development of the alloy was studied via the x-ray diffraction (XRD) technique. The B2–NiAl intermetallic developed a thin scale of stable Al2O3 alloy due to oxidation in air at 750 °C for 120 h. As a result, further oxidation on the sample's surface was restricted, except the traces of Al2O3 formed via intergranular oxidation transformed into a metastable monoclinic oxynitride phase due to nitrogen (N) contamination. DA - 2019-11 DB - ResearchSpace DP - CSIR J1 - Vacuum KW - B2-NiAl KW - Brittle KW - Cubic KW - Electron Backscatter Diffraction KW - EBSD KW - Intermetallic KW - Chemicals LK - https://researchspace.csir.co.za PY - 2019 SM - 0042-207X T1 - Investigation into the thermal behaviour of the B2–NiAl intermetallic alloy produced by compaction and sintering of the elemental Ni and Al powders TI - Investigation into the thermal behaviour of the B2–NiAl intermetallic alloy produced by compaction and sintering of the elemental Ni and Al powders UR - http://hdl.handle.net/10204/12698 ER -22652