A Study on Synthesis of Ni-Ti-B Alloy by Mechanical Alloying from Elemental Component Powder

  • Kim, Jung Geun ;
  • Park, Yong Ho
  • Received : 2016.04.05
  • Accepted : 2016.06.02
  • Published : 2016.06.28


A Ni-Ti-B alloy powder prepared by mechanical alloying (MA) of individual Ni, Ti, and B components is examined with the aim of elucidating the phase transitions and crystallization during heat treatment. Ti and B atoms penetrating into the Ni lattice result in a Ni (Ti, B) solid solution and an amorphous phase. Differential thermal analysis (DTA) reveals peaks related to the decomposition of the metastable Ni (Ti, B) solid solution and the separation of equilibrium $Ni_3Ti$, $TiB_2$, and ${\tau}-Ni_20Ti_3B_6$ phases. The exothermal effects in the DTA curves move to lower temperatures with increasing milling time. The formation of a $TiB_2$ phase by annealing indicates that the mechanochemical reaction of the Ni-Ti-B alloy does not comply with the alloy composition in the ternary phase diagram, and Ti-B bonds are found to be more preferable than Ni-B bonds.


Ball-milling;Mechanical alloying;X-ray diffraction;Phase transitions;Differential Thermal Analysis


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