By the minor addition of Nb to a Mg-Cu-Ag-Gd alloy,a Mg-Cu-Ag-Gd-Nb bulk metallic glass (BMG) with improved thermal stability and corrosion resistance as well as good mechanical properties was developed.Mg54Cu26.5Ag8.5Gd11-xNbx (x=0,1) BMGs with a diameter of 2 mm were fabricated by copper-mold casting.The Mg54Cu26.5Ag8.5Gd10Nb1 BMG exhibits enlarged supercooled liquid region of 58 K.Electrochemical measurements indicate that the addition of Nb improves the corrosion resistance of the Mg-based BMG in NaCl solution evidenced by the increased corrosion potential,though no significant effect of Nb on the corrosion behavior of the BMG in NaOH solution is observed.The Mg-Cu-Ag-Gd-Nb BMG also shows high compressive strength up to 890 MPa and elastic strain of about 1.9％.
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