Abstract
<em><span lang="EN-US">The study of oxidation behavior of amorphous alloys based on Zirconium with 2 variations in composition was carried out: Zr<sub>64.5</sub>Cu<sub>17</sub>Ni<sub>11</sub>Al<sub>7.5 </sub>and Zr<sub>69.5</sub>Cu<sub>12</sub>Ni<sub>11</sub>Al<sub>7.5 </sub>at temperatures of 400 - 450˚C in air. Amorphous Zr-based alloys were thermally characterized using Differential Scanning Calorimeter (DSC) to determine the crystallization temperature and glass transition temperature. The oxidation characterization was carried out using a Thermo gravimetric Analyzer (TGA) at temperatures of 400, 425, and 450˚C for 4 hours in air. The phase analysis of the oxidation product was identified using X-Ra</span><span>y Diffaction</span><span lang="EN-US"> (XRD). Based on DSC data the crystallization temperature for Zr<sub>64.5</sub>Cu<sub>17</sub>Ni<sub>11</sub>Al<sub>7.5</sub> and Zr<sub>69.5</sub>Cu<sub>12</sub>Ni<sub>11</sub>Al<sub>7.5 </sub>is 426 and 442˚C respectively. The oxidation kinetics of the two alloys follow parabolic law and the oxidation rate increases with the addition of temperature. Oxides formed during isothermal oxidation in the Zr<sub>64.5</sub>Cu<sub>17</sub>Ni<sub>11</sub>Al<sub>7.5 </sub>and Zr<sub>69.5</sub>Cu<sub>12</sub>Ni<sub>11</sub>Al<sub>7.5</sub> alloys are t-ZrO<sub>2</sub> (tetragonal) as the dominant phase and ZrO<sub>2</sub> (monoclinic) and CuO as the minor phase. The intermetallic phase is also formed in both samples, t-Zr<sub>2</sub>Ni and Zr<sub>2</sub>Cu.</span></em>
Highlights
Research related to Zirconiumbased metallic glass material has been carried out
Determination of heating temperature depends on the rate of heating used in the DTA-TG equipment to obtain the value of the glass transition temperature (Tg) and the crystallization temperature (Tx)
In isothermal oxidation for zirconium-based amorphous alloys above the crystallization temperature, it is found that the oxidation rate increases when the temperature is raised, whereas on Zirconium-based Nano crystal alloys the higher the temperature, the lower the oxide rate
Summary
Research related to Zirconiumbased metallic glass material has been carried out. Zirconium as a compound element is used as an reinforcement in steelmaking, porcelain, sports equipment such as golf and racket sticks, and many other applications (Appel, 2000; Mondal, Chatterjee, & Murty, 2007; Telford, 2004). Oxidation Behavior of Zr-Based Amorphous Alloys at 400 ̊- 450 ̊C in Air In the high temperature the superior properties of Zirconium based metallic glass will be degraded namely amorphous structure stability and oxidation resistance (Köster & Jastrow, 2007; Neogy et al, 2004; Triwikantoro, Toma, Meuris, & Köster, 1999; Zander & Köster, 2004). Zirconium-based amorphous alloy oxidation kinetics follow parabolic law and the oxidation rate increases with increasing temperature (Kai et al, 2009; Mondal et al, 2007; Triwikantoro & Munawaroh, 2008; Triwikantoro et al, 1999).
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