Abstract
We developed novel Ti-Zr-Be-Co bulk metallic glasses through Co addition based on a ternary Ti45Zr20Be35 alloy. By altering the alloying routes and alloying contents, the influence of Co alloying on glass-forming ability, thermal stability, thermoplastic formability, crystallization behavior, and corrosion resistance has been investigated systematically. It was found that the best alloying route for enhancing the glass-forming ability, thermoplastic formability, compressive plasticity, and corrosion resistance is to replace Be by Co. Ti45Zr20Be23Co12 possesses the largest critical diameter of 15 mm for glass formation. Ti45Zr20Be27Co8 possesses the highest thermoplastic formability which is comparable to that of Vitreloy alloys. Ti45Zr20Be25Co10 exhibits the largest room temperature plasticity of 15.7% together with a high specific strength of 3.90 × 105 Nm/kg. The addition of Co also strongly affects the crystallization behavior of the base alloy, resulting in a more complex crystallization process. The corrosion resistance of Ti-Zr-Be alloy in 1 mol/L HCl solution can also be enhanced by Co alloying. The related mechanisms have been explained in detail, which provide guidance for the composition design of Ti-based metallic glasses with improved properties.
Highlights
Due to the demand of reducing the energy consumption and protecting the environment, lightweight metals and alloys are attached more and more importance in a broad range of industries such as aerospace, electronics, automotive, etc. [1,2]
Ti-based Bulk metallic glasses (BMGs) possess the most promise for engineering application because of their relatively good combination of glass-forming ability (GFA), strength, and ductility [10,11,12,13,14]
To evaluate the GFA of different Ti-Zr-Be-Co alloys more efficiently, sections with different diameters were cut from the conical samples using a diamond saw
Summary
Due to the demand of reducing the energy consumption and protecting the environment, lightweight metals and alloys are attached more and more importance in a broad range of industries such as aerospace, electronics, automotive, etc. [1,2]. Bulk metallic glasses (BMGs) possess better mechanical properties and corrosion resistance than those of the corresponding crystalline alloys due to the single amorphous structure [3,4,5]. Al-based BMGs is the relatively low glass-forming ability (GFA) (the maximum critical diameter of only 1.5 mm [6]), while Mg-based BMGs always lack room temperature plasticity even upon compression [8,9]. Ti-based BMGs possess the most promise for engineering application because of their relatively good combination of GFA, strength, and ductility [10,11,12,13,14]. As the developed Ti-based BMGs are still far from perfect, to widen the application scopes, more efforts are needed to develop novel Ti-based BMGs with higher glass-forming ability (GFA), larger room temperature plasticity, and better corrosion resistance
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