Mechanical properties of Ti-(Al₃Ti+Al) and Ti-Al₃Ti laminated composites

Marek Konieczny

Quarterly No. 2, 2013 pages 102-106

DOI:

keywords: laminated composites, Al3Ti intermetallic phase, mechanical properties, fracture

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abstract Laminated Ti-(Al₃Ti+Al) and Ti-Al₃Ti composites have been synthesised with controlled temperature and treating time using 50, 100 and 150 µ m thick titanium and 50 µ m thick aluminium foils. Microstructural examinations showed that Al₃Ti was the only phase formed during the reaction between Ti and Al. After 20 minutes of treating at 650 ° C, not all the aluminium was consumed and the composites consisted of alternating layers of Ti, Al and Al₃Ti. After 60 minutes, the aluminium layers were completely consumed, resulting in microstructures with Ti residual layers alternating with the Al₃Ti layers. Tensile strength, flexural strength and impact toughness measurements were performed on the materials with different microstructures to establish the properties and fracture behaviour. After 60 minutes of treating, all the composites had a higher yield strength, higher ultimate tensile strength and higher flexural strength than those composites after 20 minutes of treating produced with the same thickness of starting Ti foil. On the other hand, the strain at fracture and impact toughness of the composites behaved conversely. The results of the investigations indicated that the mechanical properties of the composites strongly depend on the thickness of the individual Ti layers and the presence of residual Al layers at the intermetallic centrelines.