Honors College Thesis
 

Effects of nickel addition In Cu-Zr-Hf-Al metallic glass matrix

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https://ir.library.oregonstate.edu/concern/honors_college_theses/qv33s520n

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  • Metallic glasses (also referred to as amorphous metals) have been gaining interest in the materials science community in recent years. These amorphous materials demonstrate promising properties compared to their crystalline counterparts that include much higher strength and elastic strain limit, better corrosion and wear resistance, superior soft magnetism, and an extremely smooth surface. Copper-based metallic glasses (CBMGs), the focus of this thesis, are of particular interest to materials scientists due to their attractive physical properties and relatively low cost of the base element. Most CBMGs possess a fairly limited glass forming ability (GFA), requiring at least one dimension to be kept under 10 mm to retain the glassy structure. This thesis focuses on the effects of nickel addition to a base CBMG alloy, namely, Cu46Zr33.5Hf13.5Al7 (at. %). This specific CBMG was discovered by the Xu group at OSU. It possesses outstanding GFA (allowing the smallest dimensions to exceed 28 mm), manufacturability and processability. DSC testing shows that the glass transition temperature increases while the onset crystallization temperature decreases with increasing nickel addition. Microhardness (indentation) tests reveal that the hardness increases with the addition of nickel. Formation of shear bands is clearly and consistently observed under indentation in the (Cu46Zr33.5Hf13.5Al7)97Ni3 alloy with 3% Ni in replacement of all the other elements, which is suggestive of enhanced ductility and toughness in this particular composition. This research provides useful information for future engineering applications of the Cu46Zr33.5Hf13.5Al7 CBMG.
  • Keywords: metals, materials, glass, amorphous, metallurgy
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