International Mediterranean Natural Sciences, Health Sciences and Engineering Congress (MENSEC), Budapest, Macaristan, 10 - 12 Eylül 2019, cilt.3, ss.33-38
Rapid solidification process for the manufacture of metallic alloys mechanical properties markedly the same composition is better than conventionally solidified alloy. Increased solid solubility limit and better distribution of secondary phases in alloys due to rapid solidification that improves mechanical properties. Moreover, it is possible to fabricate metastable samples such as, amorphous, nano-crystals and quasi-crystals alloys by cooling metallic melts at cooling rates over the 104 Ks−1. On the other hand, Al-Ni based alloys are widely used in automobile, aircraft and weapons industry due to their high mechanical properties, light weight, good portability and excellent corrosion resistance. The physical properties of Al-Ni alloy are being developed with the help of alloying elements such as Si, Cu, Zr, etc. In this study, the effect of rapid solidification production method on the microstructural and mechanical properties of Al–3Ni-3Sb alloys was investigated. The Al–3Ni-3Sb samples were produced by the ingot casting and melt spinning methods at 20 m/s. The morphologies of the alloys were analyzed by optic microscopy (OM) and the phase structures were examined by X-ray diffractometry (XRD). The microstructure has significantly changed with rapid solidification; the microstructures changed from transformed into smaller dendrites and particles than larger rods and dendrites with rapid solidification process. The X- ray diffraction patterns of the melt spun samples at 20 m/s showed Al3Ni and AlSb and the α–Al phases. The mechanical properties of the ingot and melt-spun alloy was measures Vickers micro-hardness test method. The microhardness values of the rapidly solidified sample were about 2.4 times higher than those of ingot counterpart sample.