Zr-based metallic glass strip: low-temp plasticity, Charpy toughness, twin-roll casting.
Twin-Roll Strip Casting Setup :
The twin-roll strip casting technique is employed to produce metallic glass strips. A triple twin-roller device has been specifically designed to enhance cooling rates and reduce crystallization, enabling the production of thicker metallic glass strips. This setup facilitates the fabrication of Zr-based metallic glass strips with improved mechanical properties.
Microstructure and Mechanical Properties :
The microstructure of the produced Zr-based metallic glass strips is characterized by a featureless, amorphous structure, as observed through transmission electron microscopy (TEM). The mechanical properties, including compressive plasticity and impact toughness, are influenced by the cooling rates during the casting process. Higher cooling rates lead to improved mechanical properties by reducing the formation of crystalline phases.
Fracture Behavior and Toughness :
Fracture behavior studies indicate that the presence of crystalline phases within the metallic glass matrix can enhance fracture toughness by impeding crack propagation. The distribution and size of these crystalline phases play a crucial role in determining the overall toughness of the material.
Fracture Surface Analysis :
Detailed analysis of fracture surfaces reveals the formation of shear bands and the interaction between the glassy matrix and crystalline phases. These observations provide insights into the mechanisms governing the mechanical behavior of Zr-based metallic glass strips under stress.
Description:
This study investigates the low-temperature compressive plasticity and Charpy impact toughness of Zr-based metallic glass strips fabricated using the twin-roll strip casting method. The rapid cooling inherent in this process produces amorphous strips with enhanced mechanical properties, including improved plastic deformation and resistance to impact fracture at low temperatures. These characteristics make Zr-based metallic glasses promising materials for advanced structural and engineering applications requiring high strength and toughness under extreme conditions.
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