The effect of substitutional element Zn on corrosion behavior of Mg 65 Cu 25 Gd 10 glass was investigated. The amorphous structure of Mg 65 Cu 25 -x Zn x Gd 10 (x=0, 5) alloys were examined by X-ray diffractometry and differential scanning calorimetry (DSC). The dissolution rates of Mg 65 Cu 25 -x Zn x Gd 10 (x=0, 5) metallic glasses in a 5 wt% NaCl solution with pH value of 7 were determined by a hydrogen evolution testing method. The corrosion behavior of these alloys was characterized using dipping tests with 5 wt% NaCl, in combination with electrochemical measurements and scanning electron microscopy (SEM). Results show that the anti-corrosion ability of Mg 65 Cu 25 Gd 10 alloy is significantly improved due to the addition of Zn. Possible mechanism responsible for the improvement is discussed.
The effect of heat treatment on mechanical prosperities of Mg65Cu25Gd10 glass has been
studied in this paper. The thermal stability and the structure of as-spun and heat treated Mg65Cu25Gd10
alloys were examined by differential scanning calorimetry (DSC) and X-ray diffractometry (XRD).
The compression tests were performed using a computer controlled tensile test machine. Extended
X-ray absorption fine structure (EXAFS) was applied to study the structural changes of
Mg65Cu25Gd10 glass during annealing. Results showed that the decline of mechanical properties for
Mg65Cu25Gd10 glass after annealing was closely related to the changes in local environment of Cu
atoms and appearance of crystalline phases, and not the Gd local structure.
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