Oxidation of Zr55Cu30Al10Ni5 bulk metallic glass in the glassy state and the supercooled liquid state

2004 ◽  
Vol 80 (8) ◽  
pp. 1737-1744 ◽  
Author(s):  
L. Liu ◽  
K.C. Chan
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Liquid State ◽  
Glassy State ◽  
Supercooled Liquid ◽  
Supercooled Liquid State

Initial Oxidation Behavior of Zr55Cu30Al10Ni5 Bulk Metallic Glass in Short-Term Stage

2011 ◽  
Vol 675-677 ◽  
pp. 209-212 ◽  
Author(s):  
Dong Ya Huang ◽  
Bin Wang ◽  
Vincent Ji ◽  
Tao Zhang
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Oxidation Kinetics ◽  
Liquid State ◽  
Glassy State ◽  
Supercooled Liquid ◽  
Short Term ◽  
Initial Oxidation ◽  
Oxygen Ions ◽  
Kinetics Of

The isothermal initial oxidation kinetics of Zr55Cu30Al10Ni5 bulk metallic glass in glassy state (lower than Tg = 685K) and in surpercooled liquid state (Tg = 685 K < T < Tx=774 K) is investigated under dry air by thermogravimetric method in short-term stage (for 1.5 hours). A protective parabolic law is followed in glassy state, except at 573 K where a linear law is followed. The self-limiting oxidation kinetics evolves from a short linear stage to a steady mild growth stage in supercooled liquid state at 723 K, which is induced mainly by crystallization and by the fast growth of dense scale. The growth of the scale is dominated by the formation of tetragonal-ZrO2 (t- ZrO2) in the range of 623 K - 673 K in glassy state for 1.5 hours. The activation energy of oxidation is mainly piloted by the diffusion of oxygen ions.

Air Oxidation Kinetics Study of Zr58Nb3Cu16Ni13Al10 Bulk Metallic Glass

2009 ◽  
Vol 283-286 ◽  
pp. 209-213 ◽  
Author(s):  
Dong Ya Huang ◽  
Xiang Jin Zhao ◽  
Tao Zhang ◽  
Vincent Ji
Keyword(s):  
Metallic Glass ◽  
Bulk Metallic Glass ◽  
Oxidation Kinetics ◽  
Glassy State ◽  
Supercooled Liquid ◽  
Isothermal Oxidation ◽  
Growth Speed ◽  
Air Oxidation ◽  
Two Stages ◽  
Kinetics Of

The isothermal oxidation behavior of Zr58Nb3Cu16Ni13Al10 bulk metallic glass (BMG) under dry air in the glassy state and the supercooled liquid state (SLS) was studied by the thermogravimetric method. The oxidation rate and thickness growth speed in the SLS were both hugely higher than in the glassy state. The oxidation kinetics of BMG in both states for 1.5 hours was different, the parabolic law was followed in the glassy state at 300°C and 350°C, contrarily the linear law was followed in SLS at 400 °C. After the oxidation for 126 hours in SLS, the oxidation kinetics possessed two stages, the linear stage and the parabolic stage. The diffusion of the Cu2+ ion and CuZr intermetallic alloys were detected by GIXRD.

Sign in / Sign up

Export Citation Format

Share Document