TY  - JOUR
N2  - Laser Powder Bed Fusion-fabricated (LPBFed) nitinol shape memory alloys (SMAs), which undergo solid-solid phase transitions between austenite and martensite, are increasingly utilized in various technical fields and are subjected to a wide range of strain rates during service. This study pioneers the investigation of a comprehensive range of strain rates (3.16 × 10?6-10°/s), encompassing the strain rates used in quasi-static tensile tests reported in the existing literature, to understand their effects on the deformation mechanisms of LPBFed nitinol SMAs. Utilizing multi-scale characterization, including macroscopic mechanical evaluation, mesoscale analysis of deformation surfaces, and microscale examination of microstructure, we reveal distinct deformation behaviors at different strain rates. At lower strain rates, the mechanical behavior exhibits little sensitivity to changes in the strain rates, with stress-induced martensite transformation or martensite detwinning and variant reorientation being the primary deformation mechanisms. However, at higher strain rates, we observe significant variability in mechanical response, dominated by dislocation-induced slip and reduced occurrence of stress-induced martensitic transformation. This study provides the first comprehensive database for the engineering applications of LPBFed Nitinol SMAs and offers critical insights into optimizing mechanical and functional assessments for these advanced materials.
UR  - http://dx.doi.org/10.1016/j.msea.2024.147358
ID  - discovery10198905
TI  - Assessment of the mechanical and functional properties of nitinol alloys fabricated by laser powder bed fusion: Effect of strain rates
Y1  - 2024/11//
SN  - 0921-5093
AV  - restricted
KW  - Strain rates; Nitinol SMAs; Laser powder bed fusion; Multi-scale characterization
PB  - Elsevier BV
JF  - Materials Science and Engineering: A
A1  - Zhang, Xiaolong
A1  - Liu, Chaozong
A1  - Wang, Shuo
A1  - Jiang, Yue
A1  - Chen, Hongyi
A1  - Zhang, Qingquan
A1  - Li, Qiang
A1  - Huang, Jie
A1  - Zhang, Zhihui
N1  - This version is the author accepted manuscript. For information on re-use, please refer to the publisher?s terms and conditions.
VL  - 916
ER  -