Energetic-particle synthesis of high-strength Al(O) alloys
High-strength Al(O) alloys, initially discovered by ion implantation, have now been produced with electron-cyclotron resonance plasma deposition and pulsed-laser deposition. The mechanical properties of these deposited alloy layers were examined with nanoindentation, and finite element modeling of the indented layer on Si substrates was used to determine yield stresses for the alloys of {approximately} 1--5 GPa. The key to these high strengths is the high density of nanometer-size {gamma}-Al{sub 2}O{sub 3} precipitates formed when high concentrations (5--30 at.%) of oxygen are introduced into aluminum as individual atoms or molecules. The strongest alloys have precipitates as small as 1 nm, implying that such small precipitates block dislocation motion. Based upon previous studies with oxygen-implanted aluminum, improved tribological properties are expected for layers made by the two new deposition methods.
- Research Organization:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 171335
- Report Number(s):
- SAND-95-0407C; CONF-9510232-3; ON: DE96004104; TRN: AHC29602%%99
- Resource Relation:
- Conference: International conference on beam processing of advanced materials, Cleveland, OH (United States), 30 Oct - 2 Nov 1995; Other Information: PBD: 28 Sep 1995
- Country of Publication:
- United States
- Language:
- English
Similar Records
Exceptionally high-strength ({approximately}3 GPa) aluminum alloys demonstrated by oxygen ion implantation
Low-energy deposition of high-strength Al(0) alloys from an ECR plasma