Influences of Hydrogenation on Microstructure and Microhardness of Ti6Al4V Alloy
| Autor: | Hong Liang Hou, Wen Juan Zhao, Hua Ding, X.F. Tian, Jingwei Zhao, H.W. Xiao |
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| Rok vydání: | 2007 |
| Předmět: |
Materials science
Hydrogen Hydride Mechanical Engineering Diffusion Metallurgy Analytical chemistry Titanium alloy chemistry.chemical_element Condensed Matter Physics Microstructure Indentation hardness law.invention Optical microscope chemistry Mechanics of Materials law Transmission electron microscopy General Materials Science |
| Zdroj: | Materials Science Forum. :295-298 |
| ISSN: | 1662-9752 |
| DOI: | 10.4028/www.scientific.net/msf.561-565.295 |
| Popis: | The microstructures of Ti6Al4V alloy after hydrogenation have been investigated and analysed by optical microscopy (OM), X-ray diffraction (XRD) and transmission electron microscopy (TEM), and the influence of hydrogenation on the hardness of α and β phases has been analysed by microhardness testing. The microstructure observation revealed that δ hydride (fcc structure) precipitated in the specimens with 0.278 wt.% and 0.514 wt.% hydrogen, and a lot of dislocations and twins have been found simultaneously. The diffraction peaks moved to the lower angles because of the lattice expansion of β phase with the solution of hydrogen atoms. The result of microhardness testing shows that the hardness of α and β phases increases synchronously with increasing of hydrogen and the increment of β is larger than that of α. It is considered that the formation of δ hydrides, lattice defects and alloying element diffusion are the major factors leading to the microhardness change. |
| Databáze: | OpenAIRE |
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