On the mechanical response and microstructure evolution of NiCoCr single crystalline medium entropy alloys

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UZER B., Picak S., Liu J., Jozaghi T., Canadinc D., Karaman I., ...Daha Fazla

MATERIALS RESEARCH LETTERS, cilt.6, sa.8, ss.442-449, 2018 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 6 Sayı: 8
  • Basım Tarihi: 2018
  • Doi Numarası: 10.1080/21663831.2018.1478331
  • Dergi Adı: MATERIALS RESEARCH LETTERS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.442-449
  • Abdullah Gül Üniversitesi Adresli: Evet

Özet

Unusual strain hardening response and ductility of NiCoCr equiatomic alloy were investigated through microstructural analysis of [111], [110] and [123] single crystals deformed under tension. Nano-twinning prevailed at, as early as, 4% strain along the [110] orientation, providing a steady work hardening, and thereby a significant ductility. While single slip dominated in the [123] orientation at the early stages of deformation, multiple slip and nanotwinning was prominent in the [111] orientation. Significant dislocation storage capability and resistance to necking due to nanotwinning provided unprecedented ductility to NiCoCr medium entropy alloys, making it superior than quinary variants, and conventional low and medium stacking fault energy steels.