Synthesis of Multi-component Alloys (Co₂₀Cr₂₀Fe₂₀Mn₂₀Ti₂₀ and Co₂₀Cr₂₀Fe₂₀Mn₂₀Ti₂₀Ni₂₀) by Mechanical Alloying Route

In this article, equiatomic multicomponent alloys with the compositions of Co₂₀Cr₂₀Fe₂₀Mn₂₀Ti₂₀ and Co₂₀Cr₂₀Fe₂₀Mn₂₀Ti₂₀Ni₂₀ were synthesized by mechanical alloying with 5, 10 and 15 h of milling. During mechanical alloying, there is refinement of particles up to 10 h of milling following which there is agglomeration of particles till 15 h of milling in Co₂₀Cr₂₀Fe₂₀Mn₂₀Ti₂₀ whereas, for Co₂₀Cr₂₀Fe₂₀Mn₂₀Ti₂₀Ni₂₀, the phenomenon of cold-welding predominated up to 10 h of milling following which refinement of particles were observed till 15 h of milling due to fragmentation. X-ray diffraction technique confirmed the presence of body-centered cubic and face-centered cubic phases in both the alloys. There is a considerable decrease in crystallite size and increment in the lattice strain with increase in the milling duration for both the alloys. Both the alloys exhibited nanocrystalline nature after 15 h of milling which was confirmed by high resolution transmission electron microscopy.