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Laser Alloying of Copper and its Alloys
Abstract Laser surface alloying of copper, yellow brass and Al Bronze were carried out by duplex process involving powder alloying followed by remelting using an inclined plasma jet spraying nozzle. The aim of this investigation was to study the rapidly solidified non-equilibrium phases of copper alloys and their properties. The copper and brass substrates were surface alloyed with the powders viz., a) Ni to form silver white colour cupro-nickel and nickel silver surface layers respectively; b) Al to form the typical bronze surface with copper and c) mixture of Al:Si (2:1 wt.%) on Cu to form either a cladding of Al-Si binary alloy or a ternary Al-Si-Cu alloy. For comparison, laser alloying of pure Si on Al-Bronze was also carried out. The surface alloy had a two phase α+γ field with high microhardness of 405–460 HV0.1, compared to the substrate two phase α+β field of 215 HV0.1 hardness, d) Mixture of Pb and Sn (1:1 wt.%) was tried on brass to get a typical gunmetal surface with an additional top lubricating Pb layer suitable for sliding/bearing tribological applications. Preliminary studies of microhardness, EDX, SEM, and XRD results have revealed suitability of the alloyed coats (Si in Al-Bronze; Al-Si on Cu and Pb-Sn in brass) for further work on abrasion, erosion and sliding wear studies.
Laser Alloying of Copper and its Alloys
Abstract Laser surface alloying of copper, yellow brass and Al Bronze were carried out by duplex process involving powder alloying followed by remelting using an inclined plasma jet spraying nozzle. The aim of this investigation was to study the rapidly solidified non-equilibrium phases of copper alloys and their properties. The copper and brass substrates were surface alloyed with the powders viz., a) Ni to form silver white colour cupro-nickel and nickel silver surface layers respectively; b) Al to form the typical bronze surface with copper and c) mixture of Al:Si (2:1 wt.%) on Cu to form either a cladding of Al-Si binary alloy or a ternary Al-Si-Cu alloy. For comparison, laser alloying of pure Si on Al-Bronze was also carried out. The surface alloy had a two phase α+γ field with high microhardness of 405–460 HV0.1, compared to the substrate two phase α+β field of 215 HV0.1 hardness, d) Mixture of Pb and Sn (1:1 wt.%) was tried on brass to get a typical gunmetal surface with an additional top lubricating Pb layer suitable for sliding/bearing tribological applications. Preliminary studies of microhardness, EDX, SEM, and XRD results have revealed suitability of the alloyed coats (Si in Al-Bronze; Al-Si on Cu and Pb-Sn in brass) for further work on abrasion, erosion and sliding wear studies.
Laser Alloying of Copper and its Alloys
Gadag, S. P. (author) / Galun, R. (author) / Weisheit, A. (author) / Mordike, B. L. (author)
1996-01-01
19 pages
Article/Chapter (Book)
Electronic Resource
English
Copper , Laser alloying , Nickel-Silver , Cupro-Nickel , Al-Bronze , Special Bearing-Bronze , Lubricating layer , Lead globule , Basket Weave , Silicon needle , Rossette , Banded structure Physics , Physics, general , Surfaces and Interfaces, Thin Films , Optics, Lasers, Photonics, Optical Devices , Characterization and Evaluation of Materials
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