H. Luo, L. Shaw, University of Connecticut, Storrs, CT; D. Miracle, Air Force Research Laboratory, Wright-Patterson AFB, OH
A nanocrystalline Al93Fe3Ti2Cr2 alloy prepared through mechanical alloying and extrusion was deformed via compressive tests as a function of temperature and strain rate. The microstructure of the nanocrystalline alloy before and after deformation was characterized using transmission electron microscopy (TEM). The TEM analysis revealed the evidence of dislocation activities in the compressive deformation. Furthermore, the dislocation density depended on the test temperature and strain rate. Decreasing strain rate or increasing test temperature decreased the dislocation density. Based on the TEM analysis and the stress-strain curve as a function of the test temperature and strain rate, the deformation mechanism of the nanocrystalline Al93Fe3Ti2Cr2 alloy is discussed.
Summary: Deformation behavior of a nanocrystalline Al93Fe3Ti2Cr2 alloy and its microstructure before and after deformation have been characterized. The TEM analysis reveals the evidence of dislocation activities. Decreasing strain rate or increasing test temperature decreases the dislocation density. Deformation mechanisms are discussed based on the TEM analysis and the stress-strain curves obtained.
