Microstructures and Properties of Nanocrystalline NiFe Alloy With and Without Particulate TiC Reinforcement by Mechanica
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DUCTION
NICKEL and Iron-based super alloys are used for a wide variety of applications, the majority of which involve corrosion resistance and/or heat resistance. Some of these include aircraft gas turbines, steam turbine power plants, medical applications, nuclear power systems, chemical, and petrochemical industries. In addition, because of their unique low coefficient of thermal expansion, iron-nickel alloys have been used in industrial applications for over 100 years.[1,2] Metal matrix composites with steel matrix and ceramic particulate reinforcements are potential materials for structural applications because of their attractive physical and mechanical properties.[3].Among various ceramic particulates, TiC with high melting point (2792 K (3065 °C)) and low density (4.93 g/cm3) is considered as the best reinforcement material for steel matrix composites.[4] A relatively new technique for the production of alloys and composite powders is mechanical alloying (MA).[5–7] Mechanical alloying may be defined as a method for producing composite metal powders with a controlled fine microstructure. It is accomplished by the repeated fracturing and rewelding of powder particles mixture in a MOHAMMAD HASSAN SHIRANI BIDABADI, Teacher, ALI SAIDI, Professor, MASOUD KASIRI, Assistant Professor, MOHAMMAD AHMADI RENANI and AKBAR CHAMI, Educators, are with the Advanced Materials Research Center, Materials Engineering Department, Najafabad Branch, Islamic Azad University, Isfahan, Iran. Contact e-mail: [email protected] Manuscript submitted November 11, 2012. Article published online June 5, 2013 4800—VOLUME 44A, OCTOBER 2013
highly energetic ball mill. Components can consist of ductile metals, brittle metals, intermetallic compounds or nonmetals, and refractory compounds.[8] The current investigation has been concerned with a more detailed examination of alloy formation and microstructure changes in Fe-Ni system during ball milling, particularly the effect of TiC addition, when the elemental powders (NiFe) are milled with or without TiC, in a high-energy planetary ball mill.
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EXPERIMENTAL
Elemental powders of nickel (Ni) (99.5 pct purity, 100 lm average particle size), iron (Fe) (99.2 pct purity, 150 lm average particle size), and titanium carbide (TiC) (99.8 pct purity with an average particle size
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