• Elwany, Alaa
• Arroyave, Raymundo
• Liu, Jun
• Karayagiz, Kubra
• Tapia, Gustavo
• Franco, Brian
• Johnson, Luke
• Ma, Ji
• Karaman, Ibrahim

Abstract

<jats:title>Abstract</jats:title><jats:p>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.</jats:p>

Topics

• impedance spectroscopy
• surface
• nickel
• selective laser melting
• precipitate
• titanium