|About this Abstract
||2023 TMS Annual Meeting & Exhibition
||Additive Manufacturing and Innovative Powder/Wire Processing of Multifunctional Materials
||Additive Manufacturing of NiTi Shape Memory Alloy via Laser Metal Deposition and Laser Powder Bed Fusion
||Haopeng Shen, Kun Yang, Daniel East, Daniel Liang, Anthony Bruce Murphy, Ma Qian, Ryan T. Watkins, Douglas C. Hofmann
|On-Site Speaker (Planned)
Additive manufacturing (AM) has opened new opportunities for free design of bespoke parts and property control for different applications of shape memory alloys (SMAs). This work discusses challenges and opportunities in AM of NiTi SMAs for biomedical and space applications using laser metal deposition (LMD) and laser powder bed fusion (LPBF). Crack-free bonding between functional materials and structural materials is highly desired in integrated designs for light-weight applications. Using LMD, we studied the dissimilar material bonding between the NiTi SMA and various structural materials (Al alloy, Ti alloy and steel). Control of the cracking was explained by studying the microstructure and thermal history. We also presented the comparative study of the LMD and LPBF processes to evaluate the microstructure uniformity, phase transformation temperature and material properties. This study provides insights into cost-effective alloy development using powder mixture, large-format additive manufacturing, and process control for reliable shape memory or superelastic properties.