Strengthening of nanocrystalline Al using grain boundary solute additions: Effects of thermal annealing and ion irradiation

Kim S. E., Verma N., Oezerinc S., Jana S., Das S., Bellon P., ...Daha Fazla

MATERIALIA, cilt.26, 2022 (ESCI) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 26
  • Basım Tarihi: 2022
  • Doi Numarası: 10.1016/j.mtla.2022.101564
  • Dergi Adı: MATERIALIA
  • Derginin Tarandığı İndeksler: Emerging Sources Citation Index (ESCI), Scopus
  • Anahtar Kelimeler: Grain boundary strengthening, atom probe tomography, radiation induced mixing, radiation induced segregation, precipitate hardening, dilute Al alloys, ABRASIVE WEAR-RESISTANCE, CU-NB, STABILITY, ALLOYS, PRECIPITATION, SEGREGATION, EVOLUTION, DIFFUSION, SCANDIUM, DESIGN
  • Orta Doğu Teknik Üniversitesi Adresli: Hayır

Özet

Strengthening of nanocrystalline Al by grain boundary solute additions was investigated for a series of dilute aluminum alloys, Al-Sc, Al-Sb, Al-Cr, and Al-W with grain sizes in the range of 50-200 nm. Thermal annealing of the alloys at low temperatures led to alloy softening, but with negligible change in the grain size. The re-duction in strength can be attributed to the loss of solute in the grain boundaries arising from grain boundary diffusion and precipitation. Annealing at higher temperatures led to grain growth, but with little additional loss of strength, a result of precipitation hardening. The Al-Sc and Al-Sb alloys were additionally subjected to ion irradiation at various temperatures. These studies revealed that annealed samples regained their hardness due to solute redistribution by ion beam mixing. Alloy strength was independent of grain size between 50 and 150 nms. Irradiation-induced segregation of Sb to grain boundaries in Al-Sb further enhanced strengthening.