Nanocrystalline Ni3Al alloy produced by mechanical alloying of nickel aluminides and hot-pressing consolidation

Nanocrystalline Ni3Al-based alloys obtained by recycling of aluminium scraps via mechanical alloying and consolidation

“…The microhardness, reported by us previously [16,17], of the Ni 3 Al alloys produced by milling of powdered alloys from Ni-Al system and subsequent hot-pressing consolidation was in the range of 981-1093 HV0.1. The values of the microhardness obtained in this work are comparable to the previous work [16,17]. It is worth to note, that for comparative purposes, two additional microcrystalline samples of Ni 3 Al-based compounds were made, using arc melting method, from pieces of aluminium scraps (R1 and R2) with addition of Ni.…”

“…Another example of the Ni 3 Al intermetallic with high hardness of 9200 MPa (938 HV0.2) is the alloy obtained via severe plastic deformation by torsion (Bridgman' method) [28]. The microhardness, reported by us previously [16,17], of the Ni 3 Al alloys produced by milling of powdered alloys from Ni-Al system and subsequent hot-pressing consolidation was in the range of 981-1093 HV0.1. The values of the microhardness obtained in this work are comparable to the previous work [16,17].…”

“…In the cases described in the above references a nanocrystalline Ni (Al) supersaturated solution was the product of the MA processes. Further heating and pressing of the produced powders (consolidation process) led to the transformation of the disordered Ni(Al) solid solution into nanocrystalline ordered Ni 3 Al intermetallic compound [16,17]. The samples were well compacted and the microhardness of the bulk pellets was relatively high.…”

Nanocrystalline Ni3Al‐based alloys produced by mechanical alloying of Ni‐Al‐Co powders and consolidation

“…Further hot-pressing consolidation of the produced powders led to the transformation of Ni(Al) solid solution into ordered Ni 3 Al intermetallic compound [11].…”

“…Consolidation of nanocrystalline powders into full-density compacts preserving nanometric grain size is not easy to achieve. High pressure hotpressing is a consolidation method which, by careful control of the temperature, pressure and processing time, gives the opportunity of retaining nanocrystalline structure [9][10][11].…”