A Review of Hydride Precipitates in Titanium and Zirconium Alloys: Precipitation, Dissolution and Crystallographic Orientation Relationships
| Autor: | Xavier Feaugas, Egle Conforto |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
010504 meteorology & atmospheric sciences Hydride Precipitation (chemistry) Zirconium alloy chemistry.chemical_element Orientation (graph theory) Engineering (General). Civil engineering (General) 01 natural sciences 03 medical and health sciences Crystallography 0302 clinical medicine chemistry 030221 ophthalmology & optometry TA1-2040 Dissolution 0105 earth and related environmental sciences Titanium |
| Zdroj: | MATEC Web of Conferences, Vol 321, p 11042 (2020) |
| ISSN: | 2261-236X |
| DOI: | 10.1051/matecconf/202032111042 |
| Popis: | This work proposes a review of recent results on the formation and dissolution of hydrides in HCP alloys (Ti and Zr alloys) correlated to the nature of crystallographic hydride phases and their ORs. The crystallographic coherence observed between the surface hydride layer and the substrate is very important for many applications as for biomaterials devices. Five particular orientation relationships (OR) were identified between titanium/zirconium hydride precipitates and the oc-Ti and a-Zr substrates. In addition, the nature of hydrides have a large implication on the ductility, the strain hardening, and the local plastic strain accommodation in the Ti alloys. Our studies using XDR, TEM and SEM-EBSD have been demonstrating that the nature of the hydride phase precipitates depends on the hydrogen content. DSC has been used to obtain the hydride dissolution and precipitation energy values at the bulk scale, whose difference can be associated to misfit dislocations. Local in-situ TEM dissolution observations show the depinning of part of misfit dislocations during dissolution process. Hydride reprecipitation is thus possible only if hydrogen is not driven away during heating by misfit dislocations depinning. |
| Databáze: | OpenAIRE |
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