NDLI: Analysis of hardness of nanocrystalline coatings of aluminum-rich Ti$_{1 − x }$Al$

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Analysis of hardness of nanocrystalline coatings of aluminum-rich Ti$_{1 − x }$Al$_{ x }$N

Content Provider	Springer Nature Link
Author	GARCÍA RAMÍREZ, P J
Copyright Year	2012
Abstract	Titanium aluminum nitride coatings were fabricated by a d.c. magnetron sputtering system from a Ti–Al (60/40 wt%) target. Coatings were deposited on steel substrates, at a substrate temperature of 250 °C and a bias voltage of −80 V. The nitrogen flow was varied from 1·5–6 sccm and the Ar flow was kept constant at 20 sccm. The morphology and microstructure of the coatings were analysed by X-ray diffraction and scanning electron microscopy. The results of X-ray diffraction showed the presence of two cubic crystalline phases, TiN and AlN, which were confirmed by X-ray photoelectron spectroscopy. The Vicker hardness was obtained by the effective model of indentation. It was observed that the hardness of the coatings decreases from 22·8–9·5 GPa with an increased nitrogen content from 1·5–4·5 sccm. Subsequently, the hardness increased to 22·1 GPa by increasing nitrogen to 6 sccm. The behavior of hardness with grain size variation is consistent with the Hall-Peth relationship. The high value in the hardness of the coatings is mainly attributed to small grain sizes and the compressive stress present.
Starting Page	733
Ending Page	738
Page Count	6
File Format	PDF
ISSN	02504707
Journal	Bulletin of Materials Science
Volume Number	35
Issue Number	5
e-ISSN	09737669
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-11-06
Publisher Institution	Indian Academy of Sciences
Publisher Place	India
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Hard coatings hardness fracture toughness Ti–Al–N Engineering Materials Science
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Materials Science

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