TY - JOUR
T1 - Surface hardening of age-hardenable Cu-Ti dilute alloys by plasma nitriding
AU - Semboshi, S.
AU - Kimura, S.
AU - Iwase, A.
AU - Ohtsu, N.
N1 - Funding Information:
The authors are grateful to Prof. N. Masahashi of the Institute for Materials Research (IMR) of Tohoku University, Dr. A. Sugarawa and Dr. W.L. Gao of DOWA METALTECH Co., Ltd., and Dr. Tsuji of SDC TANAKA Inc. for useful discussions and comments. The authors also thank Mr. E. Aoyagi of the IMR and W. Saito of the Kitami Institute of Technology for their technical assistance. Financial support provided by the Japan Society for the Promotion of Science (JSPS) as a Grant-in-Aid for Scientific Research (C) (No. 26420663 ) and by the Japan Copper and Brass Association are gratefully acknowledged.
PY - 2014/11/15
Y1 - 2014/11/15
N2 - A plasma-nitriding procedure was applied to enhance the surface hardness and wear toughness of practical age-hardenable Cu-4mol% Ti alloy. Plasma nitriding at 1073K and 1173K leads to the formation of TiN surface layers with thicknesses of 300nm and 350nm, respectively, above Cu3Ti3O layers with thicknesses of approximately 700nm and 2200nm. In other words, the thicknesses of the surface compound layers increase with plasma nitriding temperature, which also increases the surface hardening. In particular, the hard TiN and Cu3Ti3O on the surface contribute to hardening of the surface to Vickers hardness of around 10GPa, which is much greater than the hardness of the substrate alloy of approximately 1.6GPa. The surface layers also modified the wear resistance significantly. Thus, an optimized plasma-nitriding procedure is a promising surface modification technique for age-hardenable Cu-Ti dilute alloys.
AB - A plasma-nitriding procedure was applied to enhance the surface hardness and wear toughness of practical age-hardenable Cu-4mol% Ti alloy. Plasma nitriding at 1073K and 1173K leads to the formation of TiN surface layers with thicknesses of 300nm and 350nm, respectively, above Cu3Ti3O layers with thicknesses of approximately 700nm and 2200nm. In other words, the thicknesses of the surface compound layers increase with plasma nitriding temperature, which also increases the surface hardening. In particular, the hard TiN and Cu3Ti3O on the surface contribute to hardening of the surface to Vickers hardness of around 10GPa, which is much greater than the hardness of the substrate alloy of approximately 1.6GPa. The surface layers also modified the wear resistance significantly. Thus, an optimized plasma-nitriding procedure is a promising surface modification technique for age-hardenable Cu-Ti dilute alloys.
KW - Cu-Ti alloy
KW - Hardness
KW - Nitriding
KW - Surface hardening
KW - TiN
KW - Wear resistance
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U2 - 10.1016/j.surfcoat.2014.08.015
DO - 10.1016/j.surfcoat.2014.08.015
M3 - Article
AN - SCOPUS:85027958228
VL - 258
SP - 691
EP - 698
JO - Surface and Coatings Technology
JF - Surface and Coatings Technology
SN - 0257-8972
ER -