Influences of Hydrogenation on Microstructure and Microhardness of Ti6Al4V Alloy
| Periodical | Materials Science Forum (Volumes 561 - 565) |
|---|---|
| Main Theme | PRICM 6 |
| Edited by | Young Won Chang, Nack J. Kim and Chong Soo Lee |
| Pages | 295-298 |
| DOI | 10.4028/www.scientific.net/MSF.561-565.295 |
| Citation | J.W. Zhao et al., 2007, Materials Science Forum, 561-565, 295 |
| Online since | October, 2007 |
| Authors | J.W. Zhao, Hua Ding, Wen Juan Zhao, X.F. Tian, H.W. Xiao, Hong Liang Hou |
| Keywords | Defect, Diffusion, Hydrides, Hydrogenation, Micro-Hardness, Ti6Al4V |
| Price | US$ 28,- |
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.
