期刊
SHAPE MEMORY AND SUPERELASTICITY
卷 5, 期 2, 页码 172-181出版社
SPRINGER INTERNATIONAL PUBLISHING AG
DOI: 10.1007/s40830-019-00218-5
关键词
Fatigue; Mechanical behavior; SMA; Additive manufacturing; Laser powder bed fusion; Ti-Zr-Nb alloy
资金
- NSERC (Natural Sciences and Engineering Research Council of Canada)
- Ministry of Education and Sciences of the Russian Federation [K4-2014-018]
Ti-18Zr-14Nb (at%) shape memory alloy was processed by laser powder bed fusion (LPBF) and subjected to post-processing annealing treatments in the 500-800 degrees C temperature range. The microstructure, crystallographic texture, static mechanical properties, and low-cycle fatigue behavior of this alloy in the as-built state and after different post-fusion annealings have been studied. It was found that a strongly columnar microstructure developed during LPBF processing morphed into a predominantly equiaxed grain structure after 800 degrees C recrystallization annealing. However, the highest number of cycles to failure during high-intensity strain-controlled fatigue testing (2% of strain in a cycle) was obtained after annealing at 500 degrees C, whereas the lowest number of cycles was found after annealing at 700 degrees C. A beneficial combination of static and fatigue mechanical properties with a relatively low Young's modulus makes 500 degrees C-annealed LPBF Ti-18Zr-14Nb components suitable for biomedical applications, especially where the capacity of LPBF to manufacture geometrically complex and patient-specific load-bearing components makes a difference.
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