The effect of processing parameters and heat-treatment on the microstructure and mechanical properties of PM CoCrFeMnNiTi0.1 high-entropy alloy

• Published in: Materials chemistry and physics Vol. 257; p. 123722
• Main Authors: Akhlaghi, Parisa, Amirjan, Mostafa, Parvin, Nader
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 01-01-2021; Elsevier BV
• Subjects: Ball milling; CoCrFeMnTi0.1; Compressive strength; FCC; Grain boundaries; Grain size; Heat treating; Heat treatment; High entropy alloy; High entropy alloys; Lamellar structure; Manganese; Mechanical alloying; Mechanical properties; Microstructure; Morphology; Nickel; Powder metallurgy; Precipitation hardening; Process parameters; Sintering (powder metallurgy); Titanium; CoCrFeMnTi0.1; High entropy alloy; Powder metallurgy; Mechanical alloying; Heat-treatment; FCC
• ISSN: 0254-0584; 1879-3312
• DOI: 10.1016/j.matchemphys.2020.123722

CoCrFeMnNiTi0.1 high-entropy alloy (HEA) was fabricated using mechanical alloying (MA) and sintering. To synthesize the HEA, the equiatomic composition of Cr, Co, Fe, Mn, and, Ni powders and Ti powder (1.0. at%) were ball milled at different times and then pressed and sintered specimens were provided. To investigate the effect of heat-treatment on the structure, sintered samples were heat-treated. The powder morphology, microstructure, X-ray diffraction, phase identification, hardness, and compressive strength investigation were performed. The results showed; over time smaller grain size was approached which led to improving the mechanical properties of the HEA. HEA structure contains FCC phase and the disappearance of XRD peaks, intensity decrement, and peak broadening occurred during milling. Heat-treatment led to round edges for the Cr-rich phase due to the decrease in the distance between the lamellar structure. Grain boundary strengthening and precipitation hardening are considered to be the main reinforcement mechanisms due to the addition of Ti. The 20-h heat-treated sample was nominated as the optimum mechanical properties.
[Display omitted]
•Effect of milling time and heat-treatment on the properties of CoCrFeMnNiTi0.1.•Decreasing lamellar spacing over time.•Decreasing the size of intermetallic sigma phase with time and heat-treatment.•Strengthening effect on the yield strength and hardness due to milling time.