UM
Evaluation of fracture toughness of ZrN hard coatings by internal energy induced cracking method
Huang J.-H.2; Chen Y.-H.2; Wang A.-N.2; Yu G.-P.2; Chen H.1
2014
Source PublicationSurface and Coatings Technology
ISSN02578972
Volume258Pages:211-218
AbstractThe objectives of this study were to evaluate the fracture toughness of ZrN hard coatings and to investigate the effects of preferred orientation and stress gradient on the fracture toughness. A recently developed energy-based method named internal energy induced cracking (IEIC) method was employed to measure the fracture toughness of ZrN hard coatings. ZrN film was continuously deposited until reaching the thickness at which the film was fractured due to stored energy accumulation. The residual stress before crack initiation was used to calculate the stored energy (G), from which fracture toughness (G) could be derived. The results showed that for a ZrN coating with (111) texture coefficient of 0.71, the fracture toughness was estimated to be ranged from 23.9 to 29.9J/m. Fracture toughness of ZrN coatings was related to both residual stress and preferred orientation, which were controlled by deposition parameters. With lower substrate bias, the residual stress and accompanying stored energy were lower and the texture remained strong (111), and therefore thicker ZrN coating could be deposited. As the film thickness was above 4.22μm, the (200) orientation increased in the strongly (111) textured ZrN coatings, which could be associated with the release of stored energy. The stored energy in the ZrN coating was partly released, when the energy was higher than 31.6J/m, accompanying with the stress relief. The release of stored energy was considered to be the driving force of texture inversion. Stress gradient may play an important role in the fracture mode. The fracture could be initiated at a position of local maximum stress gradient along with defects. The fluctuating behavior in stress gradient was possibly owing to the accumulation and relaxation of residual stress during film growth, which may serve as a stress tuning mechanism in depositing thick coatings.
KeywordFracture toughness Stored energy Stress gradient ZrN hard coating
DOI10.1016/j.surfcoat.2014.09.026
URLView the original
Language英語
全文获取链接
引用统计
被引频次[WOS]:10   [WOS记录]     [WOS相关记录]
Document TypeJournal article
专题University of Macau
Affiliation1.Universidade de Macau
2.National Tsing Hua University
推荐引用方式
GB/T 7714
Huang J.-H.,Chen Y.-H.,Wang A.-N.,et al. Evaluation of fracture toughness of ZrN hard coatings by internal energy induced cracking method[J]. Surface and Coatings Technology,2014,258:211-218.
APA Huang J.-H.,Chen Y.-H.,Wang A.-N.,Yu G.-P.,&Chen H..(2014).Evaluation of fracture toughness of ZrN hard coatings by internal energy induced cracking method.Surface and Coatings Technology,258,211-218.
MLA Huang J.-H.,et al."Evaluation of fracture toughness of ZrN hard coatings by internal energy induced cracking method".Surface and Coatings Technology 258(2014):211-218.
个性服务
推荐该条目
保存到收藏夹
查看访问统计
导出为Endnote文件
Google Scholar
中相似的文章 Google Scholar
[Huang J.-H.]的文章
[Chen Y.-H.]的文章
[Wang A.-N.]的文章
Baidu academic
中相似的文章 Baidu academic
[Huang J.-H.]的文章
[Chen Y.-H.]的文章
[Wang A.-N.]的文章
Bing Scholar
中相似的文章 Bing Scholar
[Huang J.-H.]的文章
[Chen Y.-H.]的文章
[Wang A.-N.]的文章
相关权益政策
暂无数据
收藏/分享
所有评论 (0)
暂无评论
 

除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。