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The microstructure and mechanical properties of the ZrB 2 /7085Al composites containing Sc were studied. The ZrB 2 /7085Al composites were prepared by  in situ  reaction via Al-Zr-B system. On addition of Sc, it interacted with Zr present in the alloy resulting in the production of Al 3 (Sc, Zr) precipitates. Minor addition of Sc resulted in grain refinement, change in ZrB 2  nanoparticles distribution, change in the size and morphology of the  η  phase and formation of Al 3 Sc and Al 3 (Sc, Zr) precipitates, which improved the strength significantly. The ultimate tensile strength (UTS), yield strength (YS) and elongation of 7085Al-ZrB 2 -Sc increased to 660.2, 603.4 MPa and 10.6%, respectively. These tensile properties improved 20.4%, 19.2% and 73.7%, respectively, over the 7085Al.

Effects of Sc on the microstructure and properties of in situ ZrB 2 /7085Al composites