In-situ investigation of interfacial reaction between matrix and reinforcement
In-situ investigation of interfacial reaction between matrix and reinforcement The transformation during heating between the Al matrix and the Al62.5Cu25Fe12.5 quasicrystalline (QC) reinforcing particles to form the Al7Cu2Fe ω-phase was studied by in-situ X-ray diffraction using a high-energy monochromatic synchrotron beam, which permits to follow the structural evolution and to correlate it with the mechanical properties of the composites. The Al/QC composite structure is stable up to 740 K. Above this temperature, new peaks corresponding to the tetragonal Al7Cu2Fe ω-phase can be observed (indicated by arrows in the left-hand figure). From this temperature onwards, the intensity of the ω peaks increases while those corresponding to the QC phase decreases with increasing temperature. The reaction proceeds initially at a slow rate and then it considerably accelerates above 800 K (right hand figure). At 925 K the reaction is complete: the QC peaks can no longer be detected and fcc-Al and the ω-phase are the only phases visible.
F. Ali, S. Scudino, M.S. Anwar, R.N. Shahid, V.C. Srivastava, V. Uhlenwinkel, M. Stoica, G. Vaughan, J. Eckert: “Al-based metal matrix composites reinforced with Al–Cu–Fe quasicrystalline particles: Strengthening by interfacial reaction” Journal of Alloys and Compounds 607 (2014) 274–279 URL