Spatial Control of Functional Response in 4D-Printed Active Metallic Structures.
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We demonstrate a method to achieve local control of 3-dimensional thermal history in a metallic alloy, which resulted in designed spatial variations in its functional response. A nickel-titanium shape memory alloy part was created with multiple shape-recovery stages activated at different temperatures using the selective laser melting technique. The multi-stage transformation originates from differences in thermal history, and thus the precipitate structure, at various locations created from controlled variations in the hatch distance within the same part. This is a first example of precision location-dependent control of thermal history in alloys beyond the surface, and utilizes additive manufacturing techniques as a tool to create materials with novel functional response that is difficult to achieve through conventional methods.
author list (cited authors)
Ma, J. i., Franco, B., Tapia, G., Karayagiz, K., Johnson, L., Liu, J., ... Elwany, A.
complete list of authors
Ma, Ji||Franco, Brian||Tapia, Gustavo||Karayagiz, Kubra||Johnson, Luke||Liu, Jun||Arroyave, Raymundo||Karaman, Ibrahim||Elwany, Alaa