Influences of Hydrogenation on Microstructure and Microhardness of Ti6Al4V Alloy

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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.

Info:

Periodical:

Materials Science Forum (Volumes 561-565)

Main Theme:

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., "Influences of Hydrogenation on Microstructure and Microhardness of Ti6Al4V Alloy", Materials Science Forum, Vols. 561-565, pp. 295-298, 2007

Online since:

October 2007

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$35.00

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