Microstructure and Mechanical Properties of Ti–Al–Ni–Cr–Co–Fe-Based High-Entropy Alloys

Four alloys with nominal compositions of TiAlNiCr, TiAlNiCrCo, TiAlNiCrFe and TiAlNiCrCoFe were synthesized through mechanical alloying followed by spark plasma sintering (SPS). After 8 h of milling, all the alloys developed a major parental BCC phase. SPS done on the alloys revealed that the BCC ph...

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Bibliographic Details
Published inTransactions of the Indian Institute of Metals Vol. 72; no. 6; pp. 1413 - 1416
Main Authors Anand Sekhar, R., Bakshi, Srinivasa Rao
Format Journal Article
LanguageEnglish
Published New Delhi Springer India 01.06.2019
Springer Nature B.V
Subjects
Alloy development
Aluminum
Backscattering
Chemistry and Materials Science
Chromium
Cobalt
Corrosion and Coatings
Electron imaging
Electron microscopes
High entropy alloys
Iron
Materials Science
Mechanical alloying
Mechanical properties
Metallic Materials
Microstructure
Nickel
Plasma sintering
Spark plasma sintering
Technical Paper
Tribology
Spark plasma sintering
BCC
Mechanical alloying
High-entropy alloy
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Summary:Four alloys with nominal compositions of TiAlNiCr, TiAlNiCrCo, TiAlNiCrFe and TiAlNiCrCoFe were synthesized through mechanical alloying followed by spark plasma sintering (SPS). After 8 h of milling, all the alloys developed a major parental BCC phase. SPS done on the alloys revealed that the BCC phase was retained after SPS. Sintering promoted the formation of one more BCC phase thus making the final microstructure comprised of two BCC phases. The phases were characterized using X-ray diffraction and scanning electron microscope. Backscattered electron images of the samples indicated that one BCC phase was rich in Ni and Al, whereas the second BCC phase was rich in Cr, Co and Fe. All the alloys showed good hardness and mechanical strength with values above 2000 MPa except TiAlNiCr.
ISSN:0972-2815
0975-1645
DOI:10.1007/s12666-019-01708-x