期刊
SCRIPTA MATERIALIA
卷 101, 期 -, 页码 56-59出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2015.01.018
关键词
Powder processing; Laser deposition additive manufacturing; Differential scanning calorimetry (DSC); Shape memory alloys (SMA); Martensitic phase transformation
类别
资金
- National Science Foundation [DGE1255832, CMMI 1335283]
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1335283] Funding Source: National Science Foundation
Transformation temperatures in NiTi shape memory alloys fabricated by laser based directed energy deposition with substrate heating were measured via differential scanning calorimetry. Elementally blended Ni and Ti powders produced Ni-poor (Ti53.1Ni46.9 at.%) and Ni-rich (Ni52.4Ti47.6 at.%) builds. Build volumes approaching three times the largest to date were fabricated, and specimens were extracted at selected locations to spatially resolve temperatures. Measurements were equivalent throughout as-deposited builds, and the dependence on Ni concentration corresponded to observations for conventionally processed alloys. (C) 2015 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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