Practical nano-indentation theory and experiments of the pyramidal indenter (2nd. experiments with the triangular pyramidal indenter and implementation of the theory)

摘要

In this paper, summary of the practical nano-indentation theory proposed by authors in the former paper is described. Also, the normal and new proposed implementation method of the theory are concretely discussed. Then, experiments and results of the indentation test for specimens: Carbon steel (HMV 700, HMV 500), Be-Cu alloy (HMV 300), Cu-Zn alloy (HMV 100) and stainless steel (SUS 304; 18Cr-8Ni-Fe): over the load ranging from 0.98 mN to 98 mN are shown. Especially, loading and unloading indentation curves for all specimens are clearly shown. At the same time, indentation depth and elastic recovery displacement for all specimens are tabulated. Next, implementation processes are described in detail for the specimen HMV 700 considered as the calibration specimen. After several trials of the implementation, final evaluated values, so-called, approximately true values of tester's spring constant C and truncation of the indenter's round tip T{sub}(Tri) are obtained. Using these values of C and T{sub}(Tri), Young's moduli E{sub}(S(C)) for specimens: HMV 500, HMV 300, HMV 100 and SUS 304: are calculated with the equation of Young's modulus proposed in the former paper. As a result, the agreement between the calculated values E{sub}(S(C)) and supposed values E{sub}s is good, almost within 5～6% over the load ranging from 0.98 mN to 98 mN. Therefore practical nano-indentation theory and implementation method of the theory proposed by authors are very useful for analyzation and standardization of the universal instrumented indentation testing. Furthermore, these theory and implementation method will be very effective to the smaller displacement range than 200 nm indentation depth.