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Chapter VIII Micro-hardness studies… Figure: 8.8 Plots of P/d Vs d for pure (a) and 0.3,0.4 & 0.5 wt % L-histide (b-d), L- threonine (e-g) and DL-methionine (h-J) doped KDP crystals. The values of load independent hardness and intercept are tabulated in table (8.3). It is observed that very less variation is found in load independent hardness for different doped KDP crystals. However, the values are slightly higher in pure KDP crystal. From the table (8.3) one can notice that the load independent hardness Hv obtained from Hays and Kendall law is the highest in pure KDP crystals and decreases progressively as the doping of amino acids increases in KDP crystal. The slope (Pc/d0 2 ) and intercept (a1) of the plot of P/d Vs d are listed in table (8.3) for pure and amino acid doped KDP crystals. These values are slightly higher in pure KDP crystals and the same decreases on increasing the doping of amino acids. It should be noted that in the case of a1 > 0 the normal ISE is obtained where the Hv decreases with increase in load. Notwithstanding, for a1 < 0 a RISE is obtained, where the Hv increases with increase in load. 311
Chapter VIII Micro-hardness studies… Table: 8.3 Values of load independent (Hv), the intercept on load axis (W), Standard 2 hardness slope (Pc/d0 ) and intercept (a1) values for pure and amino acid doped KDP Samples Pure KDP Crystal KDP + 0.3% Lhistidine KDP + 0.4% Lhistidine KDP + 0.5% Lhistidine KDP + 0.3% L- threonine KDP + 0.4% L- threonine KDP + 0.5% L- threonine KDP + 0.3% DL-methionine KDP + 0.4% DL-methionine KDP + 0.5% DL-methionine Load Independent Average Hv (Pa/m 2 ) crystals. Intercept on P axis W (Pa/m 2 ) 312 Standard Hardness Slope 2 Pc/d0 (N/m 2 ) Intercept a1 (N/m) 1486.9 15.00 385.7 11.29 1474.4 14.82 383.6 11.11 1469.4 14.46 379.6 10.96 1462.8 14.40 373.6 10.89 1480.7 14.80 385.1 11.09 1474.9 14.41 380.1 11.02 1469.2 14.23 371.7 11.01 1479.7 14.76 382.9 11.13 1474.1 14.31 377.7 11.05 1467.9 14.19 370.3 11.02 This leads to a reduction in the value of d upon unloading. This implies that the values of a are negative when the elastic surface stresses are tensile, which leads to a relation of these surface stresses introduced by indentation. 8.8 Crack Measurement and Fracture Toughness Indentation hardness testing has been finding applications in the scientific investigations of damage processes in highly brittle solids [4]. A suitably chosen sharp indenter tip concentrates very high levels of stresses,
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Saurashtra University Re - Accredit
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Statements Under O. Ph.D.7 of Saura
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ACKNOWLEDGEMENT The author expresse
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in-law, Mother- in -law and all oth
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of NLO materials in rapidly develop
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doped samples in comparison to the
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micro-hardness decreases. Also, as
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Papers Published in National and In
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Seminar on Recent Advances in Conde
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Chapter I Brief Introduction... Cha
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Chapter II Solution Growth…. Tabl
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Chapter II Solution Growth…. Alto
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Chapter II Solution Growth…. vapo
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Chapter II Solution Growth…. 11.
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Chapter III CHN Analysis, FT IR …
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Chapter IV Thermal Studies of …..
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Chapter VI UV-Vis Spectroscopic….
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Chapter VII Reactivity at Dislocati
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