Hard and tough CrN coatings strengthened by high-density distorted coherent grain boundaries
Liu, Liangliang 1Ruan, Qingdong 1Wu, Zhongzhen 2Li, Tijun 2Zuo, Wei 2Huang, Chao 1Wu, Yuzheng 1Wu, Zhongcan 2Fu, Ricky K. Y. 1Chu, Paul K.1
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作者信息
1. City Univ Hong Kong
2. Peking Univ
折叠
Abstract
Coherent grain boundaries (CGBs) has been revealed to improve the hardness and toughness simultaneously, but the density are not enough to increase their mechanical properties. Herein, hetero-interfaces are formed by introducing ion bombardment during magnetron sputtering to increase the amount of CGBs in the CrN coatings. By optimizing the sub-layer thickness, the quantity and width of CGBs from the (111) to (200) orientations increase significantly and consequently, the hardness and toughness of the CrN coating increase to 33.4 GPa and 14.98 MPa m(1/2), respectively. At last, the effect of the different CGBs to the coating strengthen is discussed. (C) 2021 Elsevier B.V. All rights reserved.
NSTL
Elsevier