Stress distribution variations during nanoindentation failure of hard coatings on silicon substrates

作     者：Ritambhara Dash Kushal Bhattacharyya Arnab S.Bhattacharyya Ritambhara Dash;Kushal Bhattacharyya;Arnab S.Bhattacharyya

作者机构：Department of Metallurgical and Materials EngineeringCentral University of JharkhandRanchi 835205India Department of Mechanical EngineeringNetaji Subhash Engineering CollegeKolkata 700152India Centre of Excellence in Green and Efficient Energy Technology(CoE GEET)Central University of JharkhandRanchi 835205India 

出 版 物：《Nanotechnology and Precision Engineering》 (纳米技术与精密工程（英文）)

年 卷 期：2023年第6卷第4期

页      面：1-10页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：The authors thank Dr. S. K. Mishra at CSIR-National Metallurgical Laboratory for the experimental facilities 

主　　题：Nanoindentation Hard film Finite-element analysis(FEA) Cracking mechanism Stress 

摘      要：Regarding quality inspection of technologically important nanocomposite hard coatings based on Ti,B,Si,C,and N and bioceramics such as hydroxyapatite that are used in small-scale high-precision devices and bio-implants,it is essential to study the failure mechanisms associated with nanoindentation,such as fracture,delamination,and *** stress imposed by the indenter can affect the fracture morphology and the interfacial fracture energy,depending on indenter shape,substrate type,crystallographic properties,pre-existing flaws,internal microcracks,and *** here are finite-element-based fracture studies that provide insights into the different cracking mechanisms related to the aforementioned failure process,showing that the fracture morphology is affected by the interaction of different cracking *** interfacial fracture energy,toughness,and residual stress are calculated using existing models with minor adjustments,and it is found that increasing the indenter sharpness improves the shear stress distribution,making the coating more prone to *** on the prevailing type of stress,the stress distribution beneath the depression results in either crack formation or a dislocation pile-up leading to strain *** forms of resistances resulting from the indentation process are found to affect the tip–sample conduction,and because of its stronger induced plasticity than that of a Berkovich indenter tip,a sharper cube-corner tip produces more resistance.