Sliding Wear Behavior of Spark-Plasma-Sintered Fe-Based Amorphous Alloy Coatings on Cu-Ni Alloy
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Sliding Wear Behavior of Spark-Plasma-Sintered Fe-Based Amorphous Alloy Coatings on Cu-Ni Alloy Himabindu Kasturi, Tanaji Paul, Sourabh Biswas, S. Habib Alavi, and Sandip P. Harimkar (Submitted February 6, 2018; in revised form April 11, 2018) This paper reports on the processing of Fe48Cr15Mo14Y2C15B6 amorphous alloy coatings on Cu-10%Ni (wt.%) alloy using spark plasma sintering. The amorphous alloy coatings were sintered at temperatures ranging from 575 to 675 °C at a pressure of 50 MPa. The development of microstructure, phases, and wear properties with sintering temperature of the coatings is investigated. The sintered coatings were found to be near fully dense with hardness close to that of the sintered bulk amorphous alloy. X-ray analysis indicated increasing degree of devitrification of the amorphous coatings with increasing sintering temperature. The wear behavior of the coatings is significantly influenced by the sintering temperature with volume wear rate first decreasing in the temperature range of 575-650 °C and then increasing above 650 °C. The variation in wear behavior is explained based on relative stability of the protective surface layer and embrittlement of the surface with the sintering temperature. Keywords
amorphous alloys, cupronickel, spark plasma sintering, surface engineering, wear
1. Introduction Cu-Ni alloys are one of the most widely used materials in the field of marine engineering (Ref 1, 2). From ship hulls to seawater tankers, desalination plants, piping in hydraulic suspension systems, and offshore oil rigs, numerous applications of these alloys can be found due to their excellent corrosion resistance and resistance to biofouling (Ref 3). Although these alloys have good strength, surface deformation on the application of load limits their applications in mechanical components. To utilize Cu-Ni alloys in manufacturing of mechanical components, it is important that their wear resistance is improved to avoid frequent refurbishments. While several surface engineering approaches are available to improve the wear resistance of metallic substrates, it is challenging to find processes and coating materials that improve wear resistance without sacrificing corrosion resistance for marine applications. Amorphous alloys are known to exhibit higher strength, hardness, and wear and corrosion resistance when compared to their polycrystalline counterparts. This can be attributed to the defect-free disordered atomic structure found in amorphous materials (Ref 4). However, certain undesirable characteristics such as high brittleness and low ductility make processing of these alloys into complex shapes a challenge. These characteristics have restricted the commercial use of amorphous alloys in structural applications. In lieu, development of these amorphous alloys as possible coating materials to make use of their high strength, wear, and corrosion resistance was investigated.
Himabindu Kasturi, Tanaji Paul, Sourabh Biswas, S. Habib Alavi, and Sandip P. Harimkar, Scho
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