Journal
MATERIALS CHARACTERIZATION
Volume 164, Issue -, Pages -Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2020.110358
Keywords
Titanium alloys; Selective laser melting; Spark plasma sintering; Microstructures; Mechanical properties
Categories
Funding
- Natural Science Foundation of Shaanxi Province, China [2020KW-034]
- Fundamental Research Funds for the Central Universities of Northwestern Polytechnical University [G2018KY0301]
- Young Talents Promotion Plan of Xi'an Association for Science and Technology
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To better understand the structure-mechanical properties relation of additively manufactured Ti-6Al-4V (Ti64) alloys, a comparison study was performed on Ti64 alloys fabricated by powder-based selective laser melting (SLM) and sintering methods. It is found that the SLM Ti64 alloy has prior beta grains filled with (lath alpha + needle alpha') structure. While Ti64 alloys sintered over and below beta -> alpha transformation temperature have widmanstatten alpha + beta and lamellar alpha + beta structure, respectively. The SLM Ti64 alloy has higher strength and hardness than sintered alloys, but possesses similar Young's modulus to the spark plasma sintered alloy. The mechanisms leading to the different mechanical properties are discussed based on phase compositions and contents. The results suggest that SLM Ti64 alloys potentially have better mechanical performance compared with those fabricated by conventional sintering methods.
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