MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Thermodynamic Structural Stability and Polarization Behavior of Cast Amorphous Alloy
Sachiko HiromotoTakao HanawaKazuyuki Ogawa
Author information
JOURNALS FREE ACCESS

2003 Volume 44 Issue 9 Pages 1824-1829

Details
Abstract

The thermodynamic structural stability and anodic polarization behavior in Hanks’ solution of cast amorphous Zr65Al7.5Ni10Cu17.5 alloy rods with a diameter of 2.0 mm and 2.5 mm and a length of 35 mm were evaluated. The change of the magnitude of the super-cooled liquid region owing to structural relaxation was obtained from the differential scanning calorimetry (DSC) curve. Since the super-cooled liquid region of the distant region from the sprue of mold was larger than that of the proximate region to the sprue, the structural stability was lower in the distant region than in the proximate region. It was revealed that the structural stability varies along the distance from the sprue. In electrochemical analysis in a simulated body fluid, the specimens sampled from the distant region showed higher open-circuit potential, lower passive current density, and lower pitting potential than those from the proximate region. In other words, the amorphous structure with low stability shows higher passivity but lower pitting corrosion resistance than that with high stability. Consequently, the corrosion behavior of zirconium-based amorphous alloy sensitively depends on the structural stability in a biological environment.

Information related to the author
© 2003 The Japan Institute of Metals and Materials
Previous article Next article
feedback
Top