中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 35 No. 11 November 2025 |
（1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;
2. Yunnan Precious Metals Laboratory Co., Ltd., Kunming 650106, China;
3. Department of Oral and Maxillofacial Surgery, Center of Stomatology, Xiangya Hospital, Central South University, Changsha 410008, China;
4. Thayer School of Engineering, Dartmouth College, Hanover, NH 03755, USA）
Abstract:The microstructural evolution, mechanical properties, and corrosion behavior of Ti-12Ni (wt.%) specimens produced by laser powder bed fusion (LPBF) using various volume energy density (VED) processing parameter values were investigated. The results showed that the alloy prepared at a low VED of 67 J/mm3 consisted of near-β grains. At a VED of 133 J/mm3, the alloy exhibited coarse primary Ti2Ni and fine eutectoid structure. This eutectoid structure consisted of α laths and two types of nanoscale Ti2Ni, one in the form of short rods and the other with a spherical morphology. Further increase of the VED to 267 J/mm3 led to coarsening of the eutectoid structure. The dispersed Ti2Ni nanoparticles exhibited a significant strengthening effect. The alloy produced at a VED of 133 J/mm3 showed the greatest strength with a nanohardness of (7.8±0.1) GPa and a compressive strength of (1777±27) MPa. However, the presence of Ni segregation and holes produced by the LPBF processing adversely affected the corrosion resistance of the alloy.
Key words: Ti-12Ni alloy; laser powder bed fusion; microstructural evolution; mechanical properties; corrosion resistance
