Quasi-static cyclic loadings induced inelastic deformation in a Zr-based bulk metallic glass under nanoindentation

Autor:	Sid Labdi, A. Jellad, Aymen Tekaya, Tarek Benameur
Rok vydání:	2009
Předmět:	Materials science Amorphous metal Atomic force microscopy Mechanical Engineering Significant difference Metallurgy Inelastic deformation Nanoindentation Mechanics of Materials Solid mechanics General Materials Science Composite material Softening Quasistatic process
Zdroj:	Journal of Materials Science. 44:4930-4938
ISSN:	1573-4803 0022-2461
DOI:	10.1007/s10853-009-3752-9
Popis:	Cyclic nanoindentation tests were carried out on Zr50Cu40Al10 bulk metallic glass (BMG). From the designed quasi-static and incremental cyclic experiments at loading rates ranging from 250 to 2500 μN/s and at ambient temperature, we observed significant difference in inelastic deformation as a function of solicitation modes. Under incremental cyclic loadings, the hardness of the BMG increased each time when the sample was reloaded immediately after unloading and then gradually reduced before the next unloading. In contrast, we found that quasi-static cyclic loadings induced a mechanical softening which appears to be dependent on the number of cycles and the loading rates. The inelastic deformation was studied by analysing the remnant indent morphology using atomic force microscopy. A free-volume mechanism was proposed for interpreting these observations quantitatively.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::b4291b0d44668fc9bfb79a646368ba9c https://doi.org/10.1007/s10853-009-3752-9 Zobrazit plný text záznamu Plný text ve formátu PDF