Abstract
A laser-based technique was used to deposit Fe3O4 on A319Al, producing an Fe3O4/Al reaction composite coating. Scanning Auger microscopy indicated a reaction between oxide particles and aluminum-forming Fe-Al intermetallic compounds, Al2O3, and various intermediate reaction products. Analysis of the coating region, fractured in vacuo, indicated substantial toughness of the material due to extremely refined microstructure with finely distributed oxide and intermetallic particles and strong interfacial bonding between particles and the matrix. Mechanical properties of the coating were evaluated by nanoindentation techniques employing both Berkovich and cube-corner indenters. Hardness and elastic modulus values were found to be uniform at 1.24 and 76 GPa, respectively. No radial cracking was observed for either the Berkovich or cube-corner indenters. These results indicate that the laser-induced rapidly solidified composite material is tough and fracture resistant.
| Original language | English |
|---|---|
| Pages (from-to) | 833-839 |
| Number of pages | 7 |
| Journal | Journal of Materials Research |
| Volume | 18 |
| Issue number | 4 |
| DOIs | |
| State | Published - Apr 2003 |
| Externally published | Yes |
Funding
The authors highly appreciate thoughtful discussion with Professor George M. Pharr of the University of Tennessee, Knoxville, TN. They also acknowledge the help from Fred Schwartz in laser processing. The authors also acknowledge the nanoindentation work and scanning Auger microscope work sponsored by the Assistant Secretary of Energy Efficiency and Renewable Energy, Office of Transportation Technologies, as part of the High Temperature Materials Laboratory User Program, Oak Ridge National Laboratory, managed by UT-Battelle, LLC, for the U.S. Department of Energy under Contract No. DE-AC05-00OR22725.