Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 795, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2020.139983
Keywords
Additive manufacturing; Titanium; Rapid solidification; X-ray diffraction; Interstitial lattice defect
Categories
Funding
- Japan Science and Technology Agency (JST) -Mirai Program [JPMJMI17E6]
- Council for Science, Technology and Innovation (CSTI), Crossministerial Strategic Innovation Promotion Program (SIP), Materials Integration for revolutionary design system of structural materials (JST)
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Ti-based materials with high oxygen solute contents were fabricated from mixtures of Ti powder and TiO2 particles by selective laser melting (SLM). Uniformly dissolved oxygen (O) from the TiO2 particles caused c lattice expansion in alpha-Ti crystals, which effectively increased the strengths of as-built SLM Ti-O materials. The as-built SLM Ti-O material using 1.5 wt% TiO2 showed a yield stress of 962 MPa and 15.3% elongation. The yield stress increases calculated by the Hall-Petch equation and Labusch model were equivalent to those observed experimentally, and O solid-solution strengthening was dominant in increasing yield stress.
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