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• W2895967632 abstract "The increasingly extreme and aggressive service conditions caused by today’s technological advancements have necessitated a continuous improvement in the surface dependent properties of engineering materials. This study was designed to investigate the enhancement in the surface hardness of AA1200 laser alloyed with premixed ratio of Mo+Zr+Stellite 6 using a 4.4 kW continuous wave (CW) Rofin Sinar Nd:YAG laser processing system. Microstructural evolution in the alloyed samples was studied by optical and scanning electron microscopes while phase identification was studied by x-ray diffractometer. A through-thickness hardness of the coating was measured using Vickers hardness tester. The results show the existence of metallurgical bonding between the AA1200 substrate and the fabricated MMC. SEM/EDS and XRD spectra of the MMC revealed the precipitation and modification of new and fine intermetallic compounds and alloy phases. Molybdenum in the powder mix promoted grain size refinement in the coated samples. There was considerable increase in the Vickers hardness from an average of 30.57 HV0.1 in the native alloy to an average of 280.95 HV0.1 in the MMC. This could be attributed to the evolution of metallic and intermetallic phases such as Co2.74 O4 (identified as spinel by XRD), Zirconium Aluminide (ZrAl3) Aluminium Cobalt Iron (AlCo2Fe) and Cobalt Molybdenum (Co0.08 Mo0.92) in the MMC.The increasingly extreme and aggressive service conditions caused by today’s technological advancements have necessitated a continuous improvement in the surface dependent properties of engineering materials. This study was designed to investigate the enhancement in the surface hardness of AA1200 laser alloyed with premixed ratio of Mo+Zr+Stellite 6 using a 4.4 kW continuous wave (CW) Rofin Sinar Nd:YAG laser processing system. Microstructural evolution in the alloyed samples was studied by optical and scanning electron microscopes while phase identification was studied by x-ray diffractometer. A through-thickness hardness of the coating was measured using Vickers hardness tester. The results show the existence of metallurgical bonding between the AA1200 substrate and the fabricated MMC. SEM/EDS and XRD spectra of the MMC revealed the precipitation and modification of new and fine intermetallic compounds and alloy phases. Molybdenum in the powder mix promoted grain size refinement in the coated samples. T..." @default.
• W2895967632 created "2018-10-26" @default.
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• W2895967632 date "2014-01-01" @default.
• W2895967632 modified "2023-09-23" @default.
• W2895967632 title "Phases and microhardness of pure AA1200 laser alloyed with pre-mixed ratio of (Zr+Mo+stellite 6)" @default.
• W2895967632 doi "https://doi.org/10.2351/1.5063036" @default.
• W2895967632 hasPublicationYear "2014" @default.
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