Vickers and Knoop Indentation Microhardness Study of β-SiAlON Ceramic

Abstract

In this paper, analysis and interpretation of mechanical property measurements of β-SiAlON ceramic were reported. Indentation microhardness of β-SiAlON ceramic was measured using the Knoop and Vickers indenters. The analysis of the Vickers indentation microhardness data reveals the reverse indentation size effect that is the apparent microhardness increases with increasing applied indentation test load. However, the Knoop indentation microhardness data exhibit indentation size effect that is the apparent microhardness increases with decreasing applied test load. The experimental Knoop microhardness data was analyzed using Meyer's law, elastic-plastic deformation model, proportional specimen resistance model, and Hays-Kendall's model. As a result, modified proportional specimen resistance model is found to be the most effective one for the load-independent (H LI ) microhardness determination of the SiAlON ceramic. It was seen that different models used to analyze the data obtained from the Vickers indentation do not give the same intrinsic hardness value. We also present the calculation of the Young modulus, E, of the β-SiAlON ceramic.

Influence of Pd Addition of CoCrMo Biomedical Alloys on the Microhardness Behaviour

“…In this study, the n values vary from 1.698 to 1.735 depending on Pd additive. The decrease of H V for n < 2 as the indentation test load increases is in good agreement with other reported results [1,10].…”

“…The curves in the graph show a non-linear behaviour of the microhardness up to certain value of applied test load after which its value tends to achieve saturation. This behaviour is called indentation size effect (ISE) [1,[10][11][12].…”

“…Hardness of a brittle material as determined by conventional tests (Vickers, Knoop, Berkovich, Rockwell, etc.) is a measure of the material's resistance to deformation, densification displacement and fracture [1].…”

Imprecise knowledge based design and development of titanium alloys for prosthetic applications

“…It is known that the Knoop hardness H K = 14.229 (10) where P is the applied test load in N, L is the long indentation diagonal lengths in m, and 14.229 is the geometrical constant of the diamond pyramid [58]. Again it is reported that w is the width of the indentation then…”

Influence of CaO on the Nanohardness Behaviour of AZ63 Magnesium Alloys Produced by Mechanical Alloying Method

“…If the nanohardness values decrease with the increase of applied indentation test load, such phenomenon is known as indentation size effect (ISE) [7,9,10]. On the other hand, the reverse indentation size effect (RISE) means * corresponding author; e-mail: sduosman@gmail.com that micro/nanohardness value increases with increasing applied indentation load [8,11]. ISE or RISE behavior of materials show where, when, and to what extent the materials can be used.…”