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Hastelloy C276 alloy, a typical Ni-based solid solution strengthened trademark superalloy, possesses excellent practical performance under severe environmental conditions and elevated temperatures. Hence, Hastelloy C276 has been investigated as a candidate for structural material for nuclear reactors, chemical processing and aerospace, particularly as aero-engine components. Wire arc additive manufacturing (WAAM), with its relatively high deposition efficiencies and cost-effectiveness, is revolutionising the 3D fabrication of advanced alloy components. However, the effectiveness of WAAM, for fabricating Ni-based alloys, is not fully understood. This thesis explores Hastelloy C276 structures deposited by the WAAM process, aiming to provide an insightful understanding of this process in the fabrication of Hastelloy C276 alloy and to assess and optimise different processing approaches, permitting a systematical investigation of process-microstructure-property interrelationships in WAAM ....
Transition-metal alloys are currently drawing increasing attention as promising electrocatalysts for the alkaline hydrogen evolution reaction (HER). However, traditional density-functional-theory-derived d-band theory fails to describe the hydrogen adsorption energy (ΔGH) on hollow sites. Herein, by studying the ΔGH for a series of Ni−M (M=Ti, V, Cr, Mn, Fe, Co, Cu, Zn, Mo, W) bimetallic alloys, an improved d-band center was provided and a potential NiCu electrocatalyst with a near-optimal ΔGH was discovered. Moreover, oxygen atoms were introduced into Ni−M (O−NiM) to balance the adsorption/desorption of hydroxyl species. The tailored electrocatalytic sites for water dissociation can synergistically accelerate the multi-step alkaline HER. The prepared O−NiCu shows the optimum HER activity with a low overpotential of 23 mV at 10 mA cm−2. This work not only broadens the applicability of d-band theory, but also provides crucial understanding for designing efficient HER electr ....