Static and dynamic mechanical behaviors of Ni-rich Ni50.2Ti49.8 made by laser powder bed fusion
Source abstract
Abstract
NiTi shape memory alloys made by laser powder bed fusion (LPBF) often suffer from process-induced defects such as internal porosity and surface irregularities, leading to inferior mechanical performance. This study investigates the effects of heat treatment and surface modification on static and fatigue behaviours of LPBF-manufactured Ni 50.2 Ti 49.8 (at%) shape memory alloys. Post-annealing at 800 °C results in NiTi 2 and Ni 3 Ti precipitates, suppressing stress-induced transformation, while subsequent aging at 400 °C promotes Ni 4 Ti 3 and R-phase. The annealed specimen exhibits higher fatigue strength regardless of surface treatment, whereas the aged specimen displays a higher fatigue endurance limit and lower notch sensitivity. Reducing surface irregularities via surface treatment alleviates fatigue ratcheting and damage strain for enhanced fatigue performance. Despite lower yield strength of the aged specimen, phase transformation-induced shakedown under high stress mitigates fatigue plastic strain, leading to comparable low-cycle fatigue performance. These findings offer new insights into tailoring LPBF NiTi alloys for improved fatigue reliability, especially in complex geometries.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Shape Memory Alloy Transformations · Additive Manufacturing Materials and Processes · High Entropy Alloys Studies
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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