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Coupled solute effects enable anomalous high-temperature strength and stability in nanotwinned Al alloys

Journal Article · · Acta Materialia
 [1];  [2];  [3];  [3];  [3];  [3];  [3];  [3];  [2];  [3]
  1. Purdue Univ., West Lafayette, IN (United States); Purdue Univ., West Lafayette, IN (United States)
  2. Univ. of Nebraska, Lincoln, NE (United States)
  3. Purdue Univ., West Lafayette, IN (United States)
Nanoprecipitates or grain refinement can effectively enhance the mechanical strength of Al alloys, but the room-temperature strengths of precipitation hardened and nanocrystalline Al alloys often fall below 1 GPa. Furthermore, they are largely plagued by precipitous mechanical softening at elevated temperature below 300°C, mostly due to degraded microstructural stability. Here, we report a mechanism of coupled solute effect in nanotwinned Al-Fe-Ti alloys that enables stability of nanograins up to 400°C and an unprecedented high-temperature flow stress of ~ 1.7 GPa at 300°C. The supersaturated Fe solutes in Al act as effective grain refiner, forming superstrong solid solution alloys. More importantly, empirical evidence combined with first principle calculations indicate that the Ti solutes delay the agglomeration of Fe solutes, thereby remarkably extending the temperature window for the stability of nanograins in nanotwinned Al alloys. Finally, this study highlights the opportunity to design ultrastrong and stable nanostructured alloys for potential high temperature applications via a coupled solute effect.
Research Organization:
Purdue Univ., West Lafayette, IN (United States)
Sponsoring Organization:
US Department of the Navy, Office of Naval Research (ONR); USDOE Office of Science (SC); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0016337
OSTI ID:
1852185
Alternate ID(s):
OSTI ID: 1779374
Journal Information:
Acta Materialia, Journal Name: Acta Materialia Journal Issue: C Vol. 200; ISSN 1359-6454
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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