Tensile and fracture behavior of spray formed and stir cast Al-2Mg-TiO2 composites

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 374; no. 1-2; pp. 184 - 190
• Main Authors: SUJOY KRISHNA CHAUDHURY, SINGH, A. K, SIVARAMAKRISHNAN, C. S, PANIGRAHI, S. C
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier 15.06.2004
• Subjects: Applied sciences; Elasticity. Plasticity; Exact sciences and technology; Fractures; Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology; Metals. Metallurgy; Aluminium arsenides; Composites; Ultimate strength method; Material processing; Transition element compounds; Rupture; Cracking; Tensile property; Fracture; Aluminium alloy; Composite material; Tensile strength; Inorganic compound; Dislocation; Cold rolling; Hot rolling; Titanium oxide; Defect formation; Elongation (mechanics); Crack
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/j.msea.2004.02.028

In the present work, tensile and fracture behavior of spray formed and stir cast Al-2Mg-TiO2 composites are studied. The paper illustrates the influence of processing condition on tensile properties and the fracture behavior of composites. The ultimate tensile strength of as-spray formed Al-2Mg-TiO2 composite is about 4-30% higher than as-spray formed Al-2Mg alloy. However, on contrary, the elongation of as-spray formed composite is lower than the base alloy. This is due to the generation of dislocations in composites as a result of thermal mismatch between TiO2 particles and Al matrix. An increase of about 80-100% in UTS is observed on hot and cold rolling of spray formed composites. The crack nucleation mechanism in spray formed composites is either due to particles cracking or particle/matrix debonding, whereas in case of stir cast composites, it was predominantly particle/matrix debonding and particle pull out.