Journal
MATERIALS LETTERS
Volume 333, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.matlet.2022.133595
Keywords
Ni-Mo alloy; Mechanical alloying; Spark plasma sintering
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This study investigated a Ni-38Mo binary alloy, focusing on Ni solid solution and Ni-Mo intermetallic phases. A homogeneous Ni-Mo alloy powder obtained by mechanical alloying was consolidated using spark plasma sintering (SPS). The main phases observed after sintering were a Ni(Mo) solid solution and the delta-NiMo intermetallic phase.
The present work investigated a Ni-38Mo binary alloy with a specific interest in Ni solid solution and Ni-Mo intermetallic phases. To this end, a homogeneous Ni-Mo alloy powder obtained via mechanical alloying was consolidated by spark plasma sintering (SPS). The main constitutive phases post-SPS were a Ni(Mo) solid solution and the delta-NiMo intermetallic phase. Subsequent heat treatment at 1200 degrees C caused an increase in microhardness to 985 HV, while an additional aging process at lower temperatures caused a softening effect associated with the presence of beta-Ni4Mo. Microstructural observation suggested that heat treatment at 1200 degrees C was responsible for the promotion of delta-NiMo in favor of mechanical properties and the stability of such intermetallic phase, which prevented massive phase transformation in subsequent heating. Thus, the present work may lay the groundwork for a multipurpose Ni-Mo alloy having attractive structural and functional properties.
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