Simultaneous Synthesis and Consolidation of Nanostructured MoSi2-NbSi2 Composite by High-Frequency Induction Heated Sintering and Its Mechanical Properties

Abstract

The current concern about these materials (MoSi 2 and NbSi 2 ) focuses on their low fracture toughness below the ductile-brittle transition temperature. To improve the mechanical properties of these materials, the fabrication of nanostructured and composite materials has been found to be effective. Nanomaterials frequently possess high strength, high hardness, excellent ductility and toughness, and more attention is being paid to their potential application. In this study, nanopowders of Mo, Nb, and Si were fabricated by high-energy ball milling. A dense nanostructured MoSi 2 -NbSi 2 composite was simultaneously synthesized and sintered within two minutes by high-frequency induction heating method using mechanically activated powders of Mo, Nb, and Si. The high-density MoSi 2 -NbSi 2 composite was produced under simultaneous application of 80MPa pressure and an induced current. The sintering behavior, mechanical properties, and microstructure of the composite were investigated. The average hardness and fracture toughness values obtained were 1180 kg/mm 2 and 3 MPa·m 1/2 , respectively. These fracture toughness and hardness values of the nanostructured MoSi 2 -NbSi 2 composite are higher than those of monolithic MoSi 2 or NbSi 2 .

Synthesis and Characterization of Zn-Nix Advanced Alloys Prepared by Mechanical Milling and Sintering at Solid-State Process

“…However, several studies are related to the use of the high-energy mechanical milling (HEMM) also known as mechanical alloying (MA). MA technology has been used almost 60 years as an alternative processing of various materials such as metal powder alloys, composites, intermetallic compounds, casting alloys, and ceramics [8,[19][20][21]. It is important to consider that MA is a milling process at high energy in dry or wet conditions in order to produce metallic powders or metal matrix composites giving unique properties by controlling the microstructure.…”

“…Unique conditions are the great attractive interest for researchers due to the control of the microstructure during the synthesis of materials by mechanical milling, whose purpose is to obtain desired physical and mechanical properties such as low density, uniform microporosity, good hardness and fracture toughness, and high Young's modulus, among other properties [6,9,[20][21][22][23][24]. In turn, the e ects of Ni addition in the binary Zn base alloy are of great interest to study in this research, by considering the mechanical milling at high energy as a nonequilibrium method and the consolidation of the material by sintering process in the solid state as the only alternative to produce materials with high performance and unique properties that cannot be obtained by conventional manufacturing procedures because of the melting temperature di erences.…”