Publikacje

Abstract:

Ti-(Al3Ti+Al) and Ti-Al3Ti laminated composites have been fabricated in vacuum using 50, 100, 150, 200, 400 and 600 mu m thick titanium and 50 mu m thick aluminum foils. The composites were synthesized with controlled temperature and treating time. Microstructural examinations showed that Al3Ti was the only phase formed during the reaction between Ti and Al. The initial foil thicknesses only affected the volume fraction of the resultant Ti, Al and Al3Ti layers. Treating time at 650 degrees C was a main factor determining microstructures and properties of the composites. After 20 minutes not all aluminum was consumed and therefore the composites consisted of alternating layers of Ti, Al and Al3Ti. After 60 minutes aluminum layers were completely consumed resulting in microstructures with Ti residual layers alternating with the Al3Ti layers. Mechanical tests were performed on the materials with different microstructures to establish their properties and fracture behavior. The results of investigations indicated that mechanical properties of the composites strongly depended on the thickness of individual Ti layers and the presence of residual Al layers at the intermetallic centerlines.

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Relations between Microstructure and Mechanical Properties in Laminated Ti-Intermetallic Composites Synthesized Using Ti and Al Foils