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

作　　者：Ritambhara Dash Kushal Bhattacharyya Arnab S.Bhattacharyya 

机构地区：[1]Department of Metallurgical and Materials Engineering,Central University of Jharkhand,Ranchi 835205,India [2]Department of Mechanical Engineering,Netaji Subhash Engineering College,Kolkata 700152,India [3]Centre of Excellence in Green and Efficient Energy Technology(CoE GEET),Central University of Jharkhand,Ranchi 835205,India

出　　处：《Nanotechnology and Precision Engineering》2023年第4期1-10,共10页纳米技术与精密工程（英文）

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 chipping.The 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 pre-strain.Reported 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 events.The 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 separation.Depending 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 hardening.Different 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.

关 键 词：NANOINDENTATION Hard film Finite-element analysis(FEA) Cracking mechanism STRESS 

分 类 号：TB306[一般工业技术—材料科学与工程]