首页|Microstructure and mechanical properties of Zr-Cu-Al bulk metallic glasses
Microstructure and mechanical properties of Zr-Cu-Al bulk metallic glasses
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Zr_(49)Cu_(46)Al_5 and Zr_(48.5)Cu_(46.5)Al_5 bulk metallic glasses(BMGs) with diameter of 5 mm were prepared through water-cooled copper mold casting. The phase structures of the two alloys were identified by X-ray difrractometry(XRD). The thermal stability was examined by differential scanning calorimetry(DSC). Zr_(49)Cu_(46)Al_5 alloy shows a glass transition temperature, T_g, of about 689 K, an crystallization temperature, T_x, of about 736 K. The Zr_(48.5)Cu_(46.5)Al_5 alloy shows no obvious exothermic peak. The microstructure of the as-cast alloys was analyzed by transmission electron microscopy(TEM). The aggregations of CuZr and CuZr_2 nanocrystals with grain size of about 20 nm are observed in Zr_(49)Cu_(46)Al_5 nanocrystalline composite, while the Zr_(49)Cu_(46.5)Al_5 alloy containing many CuZr martensite plates is crystallized seriously. Mechanical properties of bulk Zr_(49)Cu_(46)Al_5 nanocrystalline composite and Zr_(48.5)Cu_(46.5)Al_5 alloy measured by compression tests at room temperature show that the work hardening ability of Zr_(48.5)Cu_(46.5)Al_5 alloy is larger than that of Zr_(49)Cu_(46)Al_5 alloy.
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