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

Journal Article · · Materialia
 [1];  [2];  [3];  [2];  [2];  [2];  [2]
  1. Univ. of Illinois at Urbana-Champaign, IL (United States); University of Illinois at Urbana-Champaign
  2. Univ. of Illinois at Urbana-Champaign, IL (United States)
  3. Univ. of Illinois at Urbana-Champaign, IL (United States); Middle East Technical Univ., Ankara (Turkey)

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. Furthermore, 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.

Research Organization:
Univ. of Illinois at Urbana-Champaign, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; National Science Foundation (NSF)
Grant/Contract Number:
SC0019875; NA0003525
OSTI ID:
1890779
Alternate ID(s):
OSTI ID: 1962245
Journal Information:
Materialia, Journal Name: Materialia Vol. 26; ISSN 2589-1529
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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