naa a22 4500 510770746 CHVBK 20180411083212.0 cr unu---uuuuu 180411e20131201xx s 000 0 eng 10.1007/s11837-013-0759-0 doi (NATIONALLICENCE)springer-10.1007/s11837-013-0759-0 Phase Evolution and Densification Behavior of Nanocrystalline Multicomponent High Entropy Alloys During Spark Plasma Sintering [Elektronische Daten] [S. Praveen, B. Murty, Ravi Kottada] In the current study, the phase evolution of multicomponent equiatomic CoCrCuFeNi, CoCuFeNi, CoCrCuNi, and CoCrFeNi alloys synthesized by mechanical alloying (MA) followed by annealing was studied. From the phase evolution studies, CoCrFeNi, CoFeMnNi, CoCuFeNi, and CoFeNi were chosen to correlate the densification together with phase evolution during spark plasma sintering (SPS). MA resulted in a major face centered cubic (fcc) phase and a minor body centered cubic (bcc) phase in Cr-containing alloys, and a single fcc phase in all other alloys. After SPS, CoFeMnNi and CoFeNi remained as single fcc phase. However, CoCuFeNi transformed to two fcc phases, and CoCrFeNi had a major fcc phase with minor sigma phase. From densification studies, it was evident that CoCrFeNi showed delayed densification, albeit maximum final densification in comparison to other alloys. This behavior was attributed to distinctly different phase evolution in CoCrFeNi during SPS as compared to other alloys. Detailed phase evolution studies were carried out on CoCrFeNi by annealing the powders at different temperatures followed by conventional x-ray diffraction (XRD) and in situ high-temperature XRD of mechanically alloyed powders. The results obtained from the annealing and in situ high-temperature XRD studies were correlated with the densification and alloying behavior of CoCrFeNi alloy. The Minerals, Metals & Materials Society, 2013 Praveen S. Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, 600036, Chennai, India aut Murty B. Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, 600036, Chennai, India aut Kottada Ravi Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, 600036, Chennai, India aut JOM Springer US; http://www.springer-ny.com 65/12(2013-12-01), 1797-1804 1047-4838 65:12<1797 2013 65 11837 https://doi.org/10.1007/s11837-013-0759-0 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11837-013-0759-0 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Praveen S. Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, 600036, Chennai, India aut NATIONALLICENCE 700 1- Murty B. Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, 600036, Chennai, India aut NATIONALLICENCE 700 1- Kottada Ravi Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, 600036, Chennai, India aut NATIONALLICENCE 773 0- JOM Springer US; http://www.springer-ny.com 65/12(2013-12-01), 1797-1804 1047-4838 65:12<1797 2013 65 11837 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer