Metastabilní slitina Ti-15Mo připravená práškovou metalurgií
| Autor: | Veverková, Anna |
|---|---|
| Přispěvatelé: | Bartha, Kristina, Chráska, Tomáš |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
slitiny titanu
skenovací elektronová mikroskopie titanium alloys ultra-fine grained materials fázové transformace ultra-jemnozrnné materiály scanning electron microscopy phase transformations prášková metalurgie powder metallurgy digestive oral and skin physiology titanium alloys|ultra-fine grained materials|powder metallurgy|phase transformations|scanning electron microscopy slitiny titanu|ultra-jemnozrnné materiály|prášková metalurgie|fázové transformace|skenovací elektronová mikroskopie technology industry and agriculture food and beverages equipment and supplies complex mixtures |
| Popis: | This diploma thesis focused on manufacturing and characterization of Ti-15Mo metastable beta-Ti alloy prepared by cryogenic milling and spark plasma sintering. Initial powder was prepared by gas atomization and consequently deformed by cryogenic milling (milled powder). Both initial and milled powders were compacted by spark plasma sintering (SPS) at temperatures from 750 řC to 850 řC. Dependence of microstructure and mechanical properties on the parameters of preparation was studied. During cryo-milling, powder particles significantly changed shape from ball-shaped to disc-shaped. Particles were not refined by milling, but severely plastically deformed. SEM observations showed that all prepared samples contain duplex alpha + beta structure. Volume fraction of alpha phase is significantly higher in the sintered milled powder due to increased beta- transus temperature caused by contamination by oxygen and also due to easier alpha phase precipitation caused by refined microstructure. Maximum microhardness of 350 HV was achieved for both types of sintered powders. High microhardness of sintered initial powder can be attributed to formation of omega phase during cooling, while sintered milled powder is strengthened by refined microstructure and small alpha phase precipitates. Cryogenic milling prior to... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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