NDLI: Study on the Mechanical Properties of Heat-Treated Electroless NiP Coatings Reinforced with Al$_{2}$O$

Content Provider	Springer Nature Link
Author	Karthikeyan, S. Vijayaraghavan, L. Madhavan, S. Almeida, A.
Copyright Year	2016
Abstract	This work reports the effects of electroless co-deposition of Al$_{2}$O$_{3}$ nanoparticles and NiP to obtain a NiP-Al$_{2}$O$_{3}$ coating on the structure and mechanical properties of the composite coatings. The effects of annealing heat treatments at 373 K, 473 K, 573 K, and 673 K (100 °C, 200 °C, 300 °C, and 400 °C) on the structure and properties of the coatings were evaluated. The as-deposited coatings are a mixture of crystalline and amorphous phases that tend to crystallize during heat treatment. Heat treatment at higher temperatures causes the precipitation of the Ni$_{3}$P phase. The mechanical properties of as-deposited and heat-treated NiP-Al$_{2}$O$_{3}$ coatings were evaluated using depth-sensing indentation tests performed at loads of 200 mN. The incorporation of Al$_{2}$O$_{3}$ nanoparticles induces strengthening of the NiP coating by dispersion. Heat treatment of the NiP-Al$_{2}$O$_{3}$ coatings induced crystallization of the amorphous phase with the formation of nanosized grains and the precipitation of Ni$_{3}$P. Consequently, there is an increase in the hardness and Young’s modulus of the coatings to 15.4 ± 0.5 and 227 ± 2.8 GPa, respectively, in a combined hardening effect induced by dispersion of the Al$_{2}$O$_{3}$ nanoparticles and crystallization and precipitation during heat treatment.
Starting Page	2223
Ending Page	2231
Page Count	9
File Format	PDF
ISSN	10735623
Journal	Metallurgical and Materials Transactions A
Volume Number	47
Issue Number	5
e-ISSN	15431940
Language	English
Publisher	Springer US
Publisher Date	2016-03-03
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Metallic Materials Characterization and Evaluation of Materials Structural Materials Surfaces and Interfaces, Thin Films Nanotechnology
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Metals and Alloys Condensed Matter Physics

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