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JMEPEG https://doi.org/10.1007/s11665-020-05322-7

Mechanical Properties of Mechanical Alloyed and Spark Plasma Sintered NiAl-Based Intermetallic Composites Khadijeh Biranvand

, Mohammad-Reza Vaezi, and Mansour Razavi

Submitted: 22 February 2020 / Revised: 20 September 2020 / Accepted: 31 October 2020 The mechanical and microstructural properties of NiAl-based intermetallic composites reinforced with graphene nanoplates (GNPs) were investigated. Three different graphene contents, 0.5, 1 and 1.5 wt.%, were considered to investigate its effect on the nanocomposite properties produced by mechanical alloying and spark plasma sintering. The results showed that in the presence of graphene, the bending strength improved by almost 52.7% compared to the pure NiAl due to homogenous distribution of GNPs, the grain refinement and strength of the graphene. Among all the produced samples, NiAl-1 wt.% GNPs exhibit the highest mechanical and microstructural properties such as toughness (6.21 GPam), microhardness (6.71 GPa) and bending strength (83.88 ± 4 MPa). The perovskite phase (Ni3AlC0.5) was formed by increasing the graphene up to 1.5 wt.%, which reduced the mechanical properties compared to the other samples. Keywords

graphene nanoplates, intermetallic composite, mechanical alloying, mechanical properties, spark plasma sintering

1. Introduction NiAl intermetallic matrix composites have been the focus of many industries due to their important properties such as low density, high specific strength, excellent oxidation resistance and good thermal conductivity (Ref 1, 2). The application of NiAl is limited because of its low ductility and fracture toughness at ambient temperature. Inadequate number of sliding systems, high yield or hardness strength, poor cleavage strength or low surface energy, high strain rate sensitivity and grain boundary weakness due to brittle ambient temperature of the NiAl intermetallic compound (Ref 3). Single crystallization, microalloying, composite, sliding modification and grain size have been efforts to resolve the brittle problem at ambient temperature (Ref 4). Acceptable results are obtained using solid lubricant particles reinforcement (such as carbon nanostructures). Solid lubricant particles significantly improve the properties of NiAl-based composites due to their excellent properties including high ductility (Ref 5-7). Graphene reinforcement particles improve the properties of the NiAl matrix due to their good wear resistance, toughness and hardness. Wagih and Abu-Oqail (Ref 8) have investigated the effect of graphene nanosheets on the properties of Cu-Al2O3 matrix

Khadijeh Biranvand and Mohammad-Reza Vaezi, Department of Nano-Technology and Advanced Materials, Materials and Energy Research Center, P.O. Box 31787-316, Karaj, Alborz, Iran; and Mansour Razavi, Department of Ceramic, Materials and Energy Research Center, Karaj, Alborz, Iran. Contact e-mail: [email protected].

Journal of Materials Engineering and Performance

composite produced by powder metallurgy. The mechanical proper