Issue 48

P.H. Nayak et alii, Frattura ed Integrità Strutturale, 48 (2019) 370-376; DOI: 10.3221/IGF-ESIS.48.35 375 (a) (b) Figure 6 : SEM tensile fractured surfaces of (a) Copper-Zinc alloy (b) Copper-Zinc-12 wt.% of nano ZrO 2 composites C ONCLUSIONS n this research, by using stir casting fabrication technique the nano ZrO 2 /Copper-Zinc nano composites have been fabricated by considering 4, 8 and 12 wt. % of reinforcement. The micro-structural analysis, major mechanical behaviors like hardness, ultimate and yield strength, percentage elongation, and fractography behavior of prepared samples are studied as per ASTM standards. The matrix is almost free from pores in as cast alloy and uniformly distributed of nano particles in the prepared composite, which is evident from SEM microphotographs. The EDS analysis confirms the presence of nano ZrO 2 particles in the Cu-Zn alloy matrix. Compared to unreinforced material the mechanical properties of Cu-Zn-4, 8 and 12 wt. % nano ZrO 2 composite are superior and enhanced. Due to strain localization, the fracture surface of the composite material consists of small voids. R EFERENCES [1] Baradeshwaran, A., Elaya Perumal, A. (2014). Study on mechanical and wear properties of Al7075-Al 2 O 3 -Graphite hybrid composites, Composites Part:B, 56 , pp. 464-471. [2] Mohsen, (2011). On the role of processing parameters in producing Cu/SiC metal matrix composites via friction stir processing: Investigating microstructure, microhardness, wear andtensile behavior, Materials Characterization, 62, pp. 108-117. [3] Suhas, J, Quadros, D., Vaishak, N. L., (2016). Evaluation and characterization of tensile properties of short coated carbon fiber reinforced aluminium 7075 alloy metal matrix composites via liquid stir casting method, Material Science Research India, 13(2), pp. 66-73. [4] Naher, S., Brabazon, D., Looney, L. (2003). Simulation of the stir casting process, Journal of Materials Processing Technology, 143-144(9), pp. 567-571. [5] Zare, H., Zahedi, M., Toroghinejad, M. R., Meratian, M., Knezevic, M. (2016), Compressive, shear, and fracture behavior of CNT reinforced Al matrix composites manufactured by severe plastic deformation, Materials and Design, 106 , pp. 112-119. [6] Bagheri et al., (2016). The effect of reinforcement percentages on properties of copper matrix composites reinforced with TiC particles, Journal of Alloys and compounds, 676 , pp. 120-125. [7] Doddamani, S., Kallemulla, M. (2017). Fracture toughness investigations of Al6061-graphite particulate composite using compact specimens, Frattura ed Integrità Strutturale, 41 , pp. 484-490. I