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Title: TiNi-Based Bi-Metallic Shape-Memory Alloy by Laser-Directed Energy Deposition

Journal Article · · Materials
DOI:https://doi.org/10.3390/ma15113945· OSTI ID:1870737

In this study, laser-directed energy deposition was applied to build a Ti-rich ternary Ti–Ni–Cu shape-memory alloy onto a TiNi shape-memory alloy substrate to realize the joining of the multifunctional bi-metallic shape-memory alloy structure. The cost-effective Ti, Ni, and Cu elemental powder blend was used for raw materials. Various material characterization approaches were applied to reveal different material properties in two sections. The as-fabricated Ti–Ni–Cu alloy microstructure has the TiNi phase as the matrix with Ti2Ni secondary precipitates. The hardness shows no high values indicating that the major phase is not hard intermetallics. A bonding strength of 569.1 MPa was obtained by tensile testing, and digital image correlation reveals the different tensile responses of the two sections. Differential scanning calorimetry was used to measure the phase-transformation temperatures. The austenite finishing temperature of higher than 80 °C was measured for the Ti–Ni–Cu alloy section. For the TiNi substrate, the austenite finishing temperature was tested to be near 47 °C at the bottom and around 22 °C at the upper substrate region, which is due to the repeated laser scanning that acts as annealing on the substrate. Finally, the multiple shape-memory effect of two shape-memory alloy sides was tested and identified.

Research Organization:
Product Innovation and Engineering, LLC, St. James, MO (United States)
Sponsoring Organization:
USDOE Office of Science (SC); National Science Foundation (NSF)
Grant/Contract Number:
SC0018879; CMMI 1625736
OSTI ID:
1870737
Alternate ID(s):
OSTI ID: 1904378
Journal Information:
Materials, Journal Name: Materials Vol. 15 Journal Issue: 11; ISSN 1996-1944
Publisher:
MDPI AGCopyright Statement
Country of Publication:
Switzerland
Language:
English

References (38)

Stainless steel to titanium bimetallic structure using LENS™ journal January 2015
Microstructures and Mechanical Properties of Transient Liquid-Phase Diffusion-Bonded Ti3Al/TiAl Joints with TiZrCuNi Interlayer journal January 2016
A Review on Metallic Alloys Fabrication Using Elemental Powder Blends by Laser Powder Directed Energy Deposition Process journal August 2020
The effect of energy input on reaction, phase transition and shape memory effect of NiTi alloy by selective laser melting journal March 2020
Application of Directed Energy Deposition-Based Additive Manufacturing in Repair journal August 2019
Additive manufacturing of copper-tool steel dissimilar joining: Experimental characterization and thermal modeling journal December 2020
Direct laser deposition of alloys from elemental powder blends journal November 2001
Functionally graded NiTi shape memory alloy: Selective laser melting fabrication and multi-scale characterization journal June 2021
Microstructure evolution and deformation mechanism of NiTiFe shape memory alloy based on plane strain compression and subsequent annealing journal August 2018
Experimental investigation on laser directed energy deposition of functionally graded layers of Ni-Cr-B-Si and SS316L journal January 2020
Evolution of microstructure and hardness in NiTi shape memory alloys processed by high-pressure torsion journal January 2014
Microstructure and mechanical properties of wire arc additive manufactured bi-metallic structure journal October 2020
Physical metallurgy of Ti–Ni-based shape memory alloys journal July 2005
Directed Energy Deposition (DED) Process: State of the Art journal February 2021
Current research and industrial application of laser powder directed energy deposition journal January 2022
Multiple Memory Shape Memory Alloys journal February 2013
Preparation of Shape Memory NiTiNOL Filaments for Smart Textiles journal May 2016
Critical review of the state of the art in multi-material fabrication via directed energy deposition journal August 2021
A comparative study of Ni–Ti and Ni–Ti–Cu shape memory alloy processed by plasma melting and injection molding journal December 2011
Directed energy deposition joining of Inconel 625 to 304 stainless steel with direct bonding journal July 2021
Functionally graded material of 304L stainless steel and inconel 625 fabricated by directed energy deposition: Characterization and thermodynamic modeling journal April 2016
Effect of energy density on the interface evolution of stainless steel 316L deposited upon INC 625 via directed energy deposition journal June 2020
Investigations on phase transformation and mechanical characteristics of laser additive manufactured TiNiCu shape memory alloy structures journal December 2016
Dissimilar metals deposition by directed energy based on powder-fed laser additive manufacturing journal July 2019
A review of shape memory alloy research, applications and opportunities journal April 2014
The Effect of Annealing and Cold-drawing on the Super-elasticity of the Ni-Ti Shape Memory Alloy Wire journal November 2010
Multiple-step martensitic transformations in Ni-rich NiTi shape memory alloys journal January 2004
Deformation mechanisms in a TiNi shape memory alloy during cyclic loading journal March 2013
TiNiCuAg shape memory alloy films for biomedical applications journal March 2018
Fabricating TiNiCu Ternary Shape Memory Alloy by Directed Energy Deposition via Elemental Metal Powders journal May 2021
In-situ alloying in laser-based additive manufacturing processes: A critical review journal August 2021
The development of TiNi-based negative Poisson's ratio structure using selective laser melting journal February 2016
A State-of-the-Art Review on Solid-State Metal Joining journal January 2019
Experimental study on temperature evolution and strain rate effect on phase transformation of TiNi shape memory alloy under shock loading journal June 2019
Development and characterization of Ti-6Al-4V to 304L stainless steel gradient components fabricated with laser deposition additive manufacturing journal August 2016
Reversible elastocaloric effect related to B2–R transformation in Ni 50.5 Ti 49.5 alloy journal March 2021
Tensile deformation of NiTi wires journal January 2005
Selective leaching and surface properties of Ti50Ni50−xCux (x=0–20at.%) shape memory alloys for biomedical applications journal January 2015