Abstract
A Zr55Cu30Ni5Al10 plate-like bulk metallic glass (BMG) was prepared using copper mold suction casting. Additionally, alloy powders with the same nominal composition were synthesized. The alloy powders were welded or melted to the cleaned surface of the BMG with a laser beam acceleration voltage of 60 kV, a beam current range from 60 to 100 mA, a welding speed of 60 mm/s, as well as an impulse width of 3.0 ms. The effect of consubstantial composition welding on the microstructures and properties was investigated. The molten and subsequently solidified metallic mixtures remain an amorphous structure, but the enthalpy of the welded or melted position varies due to the combination of the micro-structural relaxation and nano-crystals precipitated during the energy inputs. The surface layers of the BMG can be significantly intensified after welding processes; however, the heat-affected zones (HAZs) exhibit a slight degradation in mechanical properties with respect to the BMG matrix. This study has important reference value for specialists working on the promotion of applications of BMGs.
Highlights
Microstructures of the surfaces and interfaces in materials are important factors to determine their performances [1,2]
It is well known that metallic glasses, including bulk metallic glasses (BMGs), are ideal model systems of dense random packing [7,8]
The effect of consubstantial composition welding on the microstructures and properties of BMG (corresponding to the second aspect (2)) was investigated
Summary
Microstructures of the surfaces and interfaces in materials are important factors to determine their performances [1,2] Due to their unique structures and properties, amorphous materials have attracted the extensive attention of researchers [3,4,5]. A substantial amount of research has been carried out and is being carried out on BMGs investigating their structural and thermal stabilities, mechanical properties, fracturing behavior, preparation and glass-forming abilities, and so on [11,12]; impurity diffusions in the amorphous alloys have been studied primarily [13,14,15]. The effect of consubstantial composition welding on the microstructures and properties of BMG (corresponding to the second aspect (2)) was investigated.
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