Microtexture and hardness of CVD deposited α-Al2O3 and TiCxN1-x coatings

Harry Chien; Michael C. Gao; Herbert M. Miller; Gregory S. Rohrer; Zhigang Ban; Paul Prichard; Yixiong Liu

doi:10.1016/j.ijrmhm.2008.09.010

Microtexture and hardness of CVD deposited α-Al₂O₃ and TiC_xN_1-x coatings

Harry Chien
, Michael C. Gao
, Herbert M. Miller
, Gregory S. Rohrer
, Zhigang Ban
, Paul Prichard
, Yixiong Liu

Deposition Science and Technology

Research output: Contribution to journal › Article › peer-review

15 Scopus citations

Abstract

The microstructures of chemical vapor deposited coatings on four tool inserts have been comprehensively characterized using electron backscatter diffraction mapping. Nanoindentation was used to measure the hardness of the TiC_xN_1-x and α-Al₂O₃ layers in each coating. The TiC_xN_1-x layers have weak [1 1 2] or [1 0 1] textures in the growth direction and are highly twinned. In these layers, coherent twins make up 13%-20% of the total grain boundary length. The alumina layers have [1 0 over(1, ̄) 4] or [0 0 01] textures in the growth direction that are 4.2-8.8 times random. The hardest coatings consist of highly twinned TiC_xN_1-x layers with weak [1 1 2] texture and α-Al₂O₃ with strong [1 0 over(1, ̄) 4] texture.

Original language	English
Pages (from-to)	458-464
Number of pages	7
Journal	International Journal of Refractory Metals and Hard Materials
Volume	27
Issue number	2
DOIs	https://doi.org/10.1016/j.ijrmhm.2008.09.010
State	Published - Mar 2009

Funding

This work was supported primarily by Kennametal Inc. and the Pennsylvania DCED. Partial support by the MRSEC program of the National Science Foundation under Award Number DMR-0520425 is also acknowledged.

Keywords

Coatings
Hardness
Microstructure
Texture

Access to Document

10.1016/j.ijrmhm.2008.09.010

Cite this

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title = "Microtexture and hardness of CVD deposited α-Al2O3 and TiCxN1-x coatings",

abstract = "The microstructures of chemical vapor deposited coatings on four tool inserts have been comprehensively characterized using electron backscatter diffraction mapping. Nanoindentation was used to measure the hardness of the TiCxN1-x and α-Al2O3 layers in each coating. The TiCxN1-x layers have weak [1 1 2] or [1 0 1] textures in the growth direction and are highly twinned. In these layers, coherent twins make up 13\%-20\% of the total grain boundary length. The alumina layers have [1 0 over(1,{\= }) 4] or [0 0 01] textures in the growth direction that are 4.2-8.8 times random. The hardest coatings consist of highly twinned TiCxN1-x layers with weak [1 1 2] texture and α-Al2O3 with strong [1 0 over(1,{\= }) 4] texture.",

keywords = "Coatings, Hardness, Microstructure, Texture",

author = "Harry Chien and Gao, \{Michael C.\} and Miller, \{Herbert M.\} and Rohrer, \{Gregory S.\} and Zhigang Ban and Paul Prichard and Yixiong Liu",

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doi = "10.1016/j.ijrmhm.2008.09.010",

language = "English",

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pages = "458--464",

journal = "International Journal of Refractory Metals and Hard Materials",

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T1 - Microtexture and hardness of CVD deposited α-Al2O3 and TiCxN1-x coatings

AU - Chien, Harry

AU - Gao, Michael C.

AU - Miller, Herbert M.

AU - Rohrer, Gregory S.

AU - Ban, Zhigang

AU - Prichard, Paul

AU - Liu, Yixiong

PY - 2009/3

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N2 - The microstructures of chemical vapor deposited coatings on four tool inserts have been comprehensively characterized using electron backscatter diffraction mapping. Nanoindentation was used to measure the hardness of the TiCxN1-x and α-Al2O3 layers in each coating. The TiCxN1-x layers have weak [1 1 2] or [1 0 1] textures in the growth direction and are highly twinned. In these layers, coherent twins make up 13%-20% of the total grain boundary length. The alumina layers have [1 0 over(1, ̄) 4] or [0 0 01] textures in the growth direction that are 4.2-8.8 times random. The hardest coatings consist of highly twinned TiCxN1-x layers with weak [1 1 2] texture and α-Al2O3 with strong [1 0 over(1, ̄) 4] texture.

AB - The microstructures of chemical vapor deposited coatings on four tool inserts have been comprehensively characterized using electron backscatter diffraction mapping. Nanoindentation was used to measure the hardness of the TiCxN1-x and α-Al2O3 layers in each coating. The TiCxN1-x layers have weak [1 1 2] or [1 0 1] textures in the growth direction and are highly twinned. In these layers, coherent twins make up 13%-20% of the total grain boundary length. The alumina layers have [1 0 over(1, ̄) 4] or [0 0 01] textures in the growth direction that are 4.2-8.8 times random. The hardest coatings consist of highly twinned TiCxN1-x layers with weak [1 1 2] texture and α-Al2O3 with strong [1 0 over(1, ̄) 4] texture.

KW - Coatings

KW - Hardness

KW - Microstructure

KW - Texture

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