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Einfluss der Yttrium Zugabe auf das Gefüge und die Korrosionsbeständigkeit von Mg−Zn−Zr‐Legierungen
Author(s) -
Jia Q.g.,
Han S.,
Sun Y.,
Zhang W.,
Xu C.,
Zhang J.
Publication year - 2019
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.201800099
Subject(s) - yttrium , microstructure , diffractometer , corrosion , materials science , scanning electron microscope , metallurgy , transmission electron microscopy , optical microscope , phase (matter) , cathodic protection , electrochemistry , grain boundary , composite material , chemistry , nanotechnology , oxide , electrode , organic chemistry
Microstructure evolution and bio‐corrosion behaviors of as‐cast Mg‐3Zn‐0.4Zr‐ x Y ( x = 0, 1, 2, 3 and 4 wt.%) alloys were studied by using optical microscope, x‐ray diffractometer, transmission electron microscopy, scanning electron microscope, immersion test and electrochemical measurement. Results indicated that yttrium addition led to significant grain refinement and to the formation of I‐phase (Mg 3 YZn 6 ) and W‐phase (Mg 3 Y 2 Zn 3 ). The volume fraction of I‐phase is dramatically increased after 2 wt% yttrium addition, and the corrosion resistance is improved, while further addition reverses the effect, due to the rising W‐phase, which increases the amount of cathodic sites and accelerates the galvanic corrosion process.