对涂层/基体系统中,基体性质对涂层压痕力学行为的影响进行了研究,得出了基体对压痕载荷位移曲线的影响规律。研究表明:在给定的条件下,当压痕位移为涂层厚度的12%~16%时,由于基体屈服强度的变化,导致压痕载荷位移曲线在此处发生偏离;在压痕位移小于涂层厚度的10%时,不同的基体屈服强度得到的压痕响应完全一致,即基体的改变对压痕响应的影响是可以忽略的;同时还发现,在压痕位移为涂层厚度的30%时,如果基体屈服强度小于2000MPa时,基体屈服应力的改变会改变涂层的压痕力学行为,而当基体屈服强度大于2000MPa时,即使继续增大基体的屈服应力,所得到的载荷-位移曲线几乎重合,即其影响可以忽略。
Abstract
The indentation response of coating-substrate is investigated using finite element analyses.The effect of substrate’s yield strength on load-displacement curve is revealed.On the certain conditions,these load-depth curves present deviation at 12%~16% of coating thickness.The results showed that substrate’s properties have a negligible effect on the indentation response when indentation displacement is less than 10% thickness of coating.Otherwise,the substrate’s plastic deformation can have serious influence.Meanwhile,this paper revealed that while yield stress is less than 2000MPa,the increasing in substrate’s yield stress can influence indentation response;on the contrary,if yield stress of the substrate is higher than 2000MPa,load-displacement curve has no change when altering substrate’s yield strength.
关键词
锥头压痕 /
涂层-基体 /
有限元分析
{{custom_keyword}} /
Key words
conical indentation /
coating-substrate /
finite element analysis
{{custom_keyword}} /
中图分类号：
TG115.5
{{custom_clc.code}}
({{custom_clc.text}})
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
参考文献
[1] NIX W D,MEHI MEDALIST R F.Mechanical properties of thin films[J].Metallurgical Transactions A,1989,20A (11):2217-2245.
[2] OLIVER W C,PHARR G M.An improved technique for determining hardness and elastic modulus using load and displacement sensing indentation experiments[J].Journal of Materials Research,1992,7 (6):1564-1583.
[3] NIX W D,GAO Hua-jian.Indentation size effects in crystalline materials:a law for strain gradient plasticity[J].Journal of the Mechanics and Physics of Solids,1998,46 (3):411-425.
[4] CHENG Y T,CHENG C M.Relationships between hardness,elastic modulus,and the work of indentation[J].Applied Physics Letters,1998,73 (5):614-616.
[5] CHENG Y T,CHENG C M.Scaling relationships in conical indentation of elastic-perfectly plastic solids[J].International Journal of Solids and Structures,1998,36 (8):1231-1243.
[6] YOO Y,LEE W,SHIN H.Effect of work hardening on the critical indentation limit in spherical nano-indentation of thin film/substrate systems[J].Surface and Coatings Technology,2004,179 (2):324-332.
[7] HIRANO A,SAKANE M,HAMADA N.Relationship between Rockwell C hardness and inelastic material constants[J].Journal of Engineering Materials and Technology,2002,124(2):179-184.
[8] SUNDGREN J E,HENTZELL H T G.A review of the present state of art in hard coatings grown from the vapor phase[J].Journal of Vacuum Science & Technology A,1986,4 (5):2259-2279.
[9] CAMMARATA R C,SCHLESINGER T E,KIM C.Nanoindentation study of the mechanical properties of copper-nickel multilayered thin films[J].Applied Physics Letters,1990,56(19):1862-1864.
[10] STAN V.The search for novel superhard materials[J].Journal of Vacuum Science & Technology A,1999,17 (5):2410-2420.
[11] SHINN M,HULTMAN L,BARNETT S A.Growth structure and microhardness of epitaxial TiN/NbN superlattices[J].Journal of Materials Research,1992,7 (4):901-911.
[12] HIBBIT,KARLSSON,SORENSON.ABAQUS handbook version 6.5[M].USA:Hibbitt Karlsson & Sorensen Inc,2005.
{{custom_fnGroup.title_cn}}
脚注
{{custom_fn.content}}
基金
国家自然科学基金资助项目(10472092);航空基础科学基金资助项目(04C53027);西北工业大学青年创新基金资助项目(M016202)
{{custom_fund}}
PDF(282 KB)
