Neutron diffraction measurements of residual stress in additive and subtractive hybrid manufactured (CoCrNi)94Ti3Al3 medium entropy alloy

(CoCrNi)94Ti3Al3 medium entropy alloy (MEA) exhibits excellent properties that are superior to traditional
alloys and possess the potential for service under specific working conditions. However, high-technology
developments have required the integrated complicated components (e.g. sharp corners, thin-walled
structures and curved shapes) with high-quality surface roughness, and dimensional accuracy. With this in
mind, additive and subtractive hybrid manufacturing (ASHM), in which additive manufacturing (AM) can
generate raw parts with near-net-shape dimensional characteristics whereas subtractive machining (SM)
operations achieve the desired dimensional accuracy and surface finish, maybe a superior manufacturing
strategy of utilizing high-performance MEA parts. It is particularly noteworthy that the SM process
complicates the residual stress generated by the thermal history of the AM process. The complex stress
distribution may cause component warping and cracking, deteriorating the service performance. We
therefore propose to study the distribution and evolution of the residual stress in the ASHM-fabricated
MEAs, to lay a reliable theoretical foundation for manufacturing high performance components.