Utilizza questo identificativo per citare o creare un link a questo documento:
|Titolo:||Microstructure, texture evolution, mechanical properties and corrosion behavior of ECAP processed ZK60 magnesium alloy for biodegradable applications|
|Autori interni:||MOSTAED, EHSAN|
HASHEMPOUR IGDERI, MAZDAK
|Data di pubblicazione:||2014|
|Rivista:||JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS|
|Abstract:||Ultra-fine grained ZK60 Mg alloy was obtained by multi-pass equal-channel angular pressing at different temperatures of 250 °C, 200 °C and 150 °C. Microstructural observations showed a significant grain refinement after ECAP, leading to an equiaxed and ultrafine grain (UFG) structure with average size of 600 nm. The original extrusion fiber texture with planes oriented parallel to extrusion direction was gradually undermined during ECAP process and eventually it was substituted by a newly stronger texture component with considerably higher intensity, coinciding with ECAP shear plane. A combination of texture modification and grain refinement in UFG samples led to a marked reduction in mechanical asymmetric behavior compared to the as-received alloy, as well as adequate mechanical properties with about 100% improvement in elongation to failure while keeping relatively high tensile strength. Open circuit potential, potentiodynamic and weight loss measurements in a phosphate buffer solution electrolyte revealed an improved corrosion resistance of UFG alloy compared to the extruded one, stemming from a shift of corrosion regime from localized pitting in the as-received sample to a more uniform corrosion mode with reduced localized attack in ECAP processed alloy. Compression tests on immersed samples showed that the rate of loss of mechanical integrity in the UFG sample was lower than that in the as-received sample.|
|Appare nelle tipologie:||01.1 Articolo in Rivista|
File in questo prodotto:
|Mostaed_JMechBeavBioMat14_ECAPZK60 Mg alloy_min.pdf||3.1 MB||Adobe PDF||Post-print||Accesso riservato|
- PubMed Central loading...
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.