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      Study and development of NiAl intermetallic coating on hypo-eutectoid steel using highly activated composite granules of the Ni–Al system

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          NiAl intermetallic coating thickness of about 50 μm was fabricated on hypo-eutectoid steel by mechanical alloying using pre-activated Ni–Al composite granules as coating material. First, Ni and Al powders were mixed with the composition of Ni-50 at.% Al and mechanically activated in a planetary ball mill, until the composite granules of this powder mixture, having maximum activity (9 cm sec −1), were formed after 120 min of milling at 200 rpm. The composite granules were then taken out from the planetary ball mill just before the critical time, i. e. the time at which these granules synthesize and convert to an intermetallic NiAl compound. The highly activated composite granules of Ni–Al were then put into the vial of a vibratory ball mill with the substrate on top of the chamber. After mechanical alloying for 60 min in the vibratory ball mill, the composite granules were synthesized fully and heat was produced during the synthesis which helped producing a thick and strong adhesive coating of NiAl intermetallic on the steel substrate. The main advantage of this technique is that not only is time saved but also there is no need for any post mechanical alloying process such as annealing or laser treatment etc. to get homogeneous, strongly bonded intermetallic coatings. X-ray diffraction analysis clearly indicates the formation of NiAl phase. Micro-hardness of the coating and substrate was also measured. The cross-sectional microstructure of the composite granules and the final coating were studied by scanning electron microscopy.

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          Most cited references 17

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          Effect of varying bilayer spacing distribution on reaction heat and velocity in reactive Al/Ni multilayers

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              The role of microstructure refinement on the impact ignition and combustion behavior of mechanically activated Ni/Al reactive composites

               B. Mason,  L. Groven,  S. Son (2013)

                Author and article information

                a National University of Science and Technology (MISIS), Moscow, Russia
                Author notes
                [* ] Correspondence address, Aamir Shahzad, MSc Advanced Materials science, College of new materials and nano technology, NUST, Misis, Moscow, Russia, National university of science and technology, MISIS, Moscow, Russia, Leninsky prospect, Moscow, 119119, Russia, Tel.: +7 (495) 6384413, Fax: +7 (495) 6384595, E-mail: aamirshah66@
                International Journal of Materials Research
                Carl Hanser Verlag
                9 January 2018
                : 109
                : 1
                : 63-67
                MK111567 10.3139/146.111567
                © 2018, Carl Hanser Verlag, München
                References: 24, Pages: 5
                Original Contributions


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