Abstract
In contrast to the abundance of studies in Fe-Al and Fe-Co, those in the Fe-Al-Co ternary system are scarce. Consequently, the phase separation and phase diagram of this system remain still ambiguous. Ternary Fe0.6Al1-xCox(x values in a molar ratio of 0.05, 0.1, 0.15, and 0.2) have been elaborated by high frequency magnetic induction fusion, in order to study the effect of cobalt ternary addition on the structural behavior such as phase separation, thermal and mechanical properties of Fe-based alloy system, by means of x-ray diffraction, thermal analysis (DSC) and Vickers microhardness. An unexpected allotropic phase transformation from stable HCP to metastable FCC Cobalt has been observed in all alloys.
Highlights
Numerous technological applications require the use of intermetallic alloys
According to the pressure–temperature phase diagram, Co is known to exist in two allotropic forms: a low-temperature HCP phase and a high-temperature FCC phase [9,10]
3 Results and discussion Addition of cobalt (5 at. %, 10 at. %, 15 at. % and 20 at. %) as a third element to binary Fe-40 % Al (Al-60% Fe) with ordered B2 structure leads to important structural evolution, as shown by the ternary equilibrium phase diagram
Summary
Numerous technological applications require the use of intermetallic alloys. New materials can be made relatively by changing the stoichiometry of the intermetallic alloys and their crystal structures. According to the pressure–temperature phase diagram, Co is known to exist in two allotropic forms: a low-temperature HCP phase and a high-temperature FCC phase [9,10]. Co is stable in the HCP form but it transforms to the FCC form when it is heated to above the transition temperature 695 K. Allotropic HCP to FCC phase transformation via mechanical milling has been reported by several authors [13]. The main purpose of this study is to determine for the first time an allotropic transformation of cobalt and a phase separation which occurs after melting and quenching alloys with different compositions of aluminium and cobalt in iron alloys
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