Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/43607
標題: Mechanical properties and deformation behavior of amorphous nickel-phosphorous films measured by nanoindentation test
作者: 張守一
Chang, S.Y.
Lee, Y.S.
Hsiao, H.L.
Chang, T.K.
關鍵字: bulk metallic-glass
nip-sic coatings
thin-films
instrumented
indentation
autocatalytic nip
scratch adhesion
alloy
hardness
stress
flow
期刊/報告no:: Metallurgical and Materials Transactions a-Physical Metallurgy and Materials Science, Volume 37A, Issue 10, Page(s) 2939-2945.
摘要: In this study, amorphous Ni-P films were deposited by electroless plating under different pH values. Their mechanical properties and deformation behavior were then investigated by instrumented nanoindentation. With increasing pH value of the plating solution from 3.75 to 6.0, the hardness and elastic modulus of the obtained Ni-P films increased from 6.1 GPa and 146 GPa to 8.2 GPa and 168 GPa respectively. From the load-indentation depth curve, the Ni-P films were found to yield at an indentation depth of 8 nm. By microstructural examination around the indented regions, early-stage plastic deformation of the amorphous Ni-P films was verified through the formation and extension of shear bands with a spacing of several tens of nanometers. Within the shear bands, flow dilatationinduced intense shear localization was expected and resulted in crystallization in the amorphous matrix. The critical shear stress and energy release rate required for the initiation of early-stage plastic yielding of the Ni-P films were calculated to be about 1.4 GPa and 3.0 J/m(2) respectively, both of which increased with pH values.
URI: http://hdl.handle.net/11455/43607
ISSN: 1073-5623
文章連結: http://dx.doi.org/10.1007/s11661-006-0175-y
Appears in Collections:材料科學與工程學系

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