Abstract
Absract:
Cobalt (Co) is a transition metal used in electronics, magnetic
recording [1], and hard materials [2–4]. Through thermal
[5] and mechanical treatment [6–9], Co metal undergoes
the allotropic HCP to FCC phase transformation. The
current literature shows that metastable FCC phase is
induced by ball milling (BM) [6], cold pressing [10], and
thermal treatments [11]. It has been shown in the previous
investigations that Co milled with W, V, and C powders
forms the complex FCC Co-rich carbide with large lattice
parameters [12]. Apart from the FCC phase, Co-based alloys
undergo amorphization via electrodeposition [13, 14] and
mechanical alloying (MA) [15–17] and during irradiation
processes [18, 19]. It is worth noting that in the case of
milling, the XRD peaks of nonmetallic elements such as Si
in a mixture with Co vanish rapidly when subjected to BM
and ultimately lead to amorphization [17]. Similar behaviour
occurs when a mixture of Co and metallic elements is
subjected to milling [15, 16, 20]...