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Influence of hydrogenation on microstructures and microhardness of Ti6Al4V alloy

Journal Article


Abstract


  • The microstructures of Ti6Al4V alloy after hydrogenation were investigated by optical microscopy(OM), X-ray diffraction(XRD) and transmission electron microscopy(TEM). The influence of hydrogenation on the hardness of α and β phases was analysed by microhardness testing. The influence of hydrogenation on alloying elements diffusion was studied by electron probe microanalysis(EPMA). The microstructural observation reveals that hydride δ (FCC structure) as well as large number of dislocations precipitate in the specimens with 0.278% and 0.514% hydrogen, and a lot of twins are found in the specimen with 0.514% hydrogen, simultaneously. The result of microhardness testing shows that the hardness of α and β phases increases synchronously with the increase of hydrogen and the hardness increment of β is larger than that of α. According to analysis of EPMA, the diffusion ability of alloy elements Al and V increases after hydrogenation. It is considered that hydrogen solution strengthening and V element diffusion are the main factors causing the hardness of α phase increase with the increase of hydrogen, and the formation of δ hydrides, lattice defects, hydrogen solution strengthening and Al element diffusion jointly cause the hardness of β phase increase with the increasing hydrogen. © 2008 The Nonferrous Metals Society of China.

Publication Date


  • 2008

Citation


  • ZHAO, J. W., DING, H., ZHAO, W. J., TIAN, X. F., HOU, H. L., & WANG, Y. Q. (2008). Influence of hydrogenation on microstructures and microhardness of Ti6Al4V alloy. Transactions of Nonferrous Metals Society of China (English Edition), 18(3), 506-511. doi:10.1016/S1003-6326(08)60089-8

Scopus Eid


  • 2-s2.0-44449097074

Start Page


  • 506

End Page


  • 511

Volume


  • 18

Issue


  • 3

Abstract


  • The microstructures of Ti6Al4V alloy after hydrogenation were investigated by optical microscopy(OM), X-ray diffraction(XRD) and transmission electron microscopy(TEM). The influence of hydrogenation on the hardness of α and β phases was analysed by microhardness testing. The influence of hydrogenation on alloying elements diffusion was studied by electron probe microanalysis(EPMA). The microstructural observation reveals that hydride δ (FCC structure) as well as large number of dislocations precipitate in the specimens with 0.278% and 0.514% hydrogen, and a lot of twins are found in the specimen with 0.514% hydrogen, simultaneously. The result of microhardness testing shows that the hardness of α and β phases increases synchronously with the increase of hydrogen and the hardness increment of β is larger than that of α. According to analysis of EPMA, the diffusion ability of alloy elements Al and V increases after hydrogenation. It is considered that hydrogen solution strengthening and V element diffusion are the main factors causing the hardness of α phase increase with the increase of hydrogen, and the formation of δ hydrides, lattice defects, hydrogen solution strengthening and Al element diffusion jointly cause the hardness of β phase increase with the increasing hydrogen. © 2008 The Nonferrous Metals Society of China.

Publication Date


  • 2008

Citation


  • ZHAO, J. W., DING, H., ZHAO, W. J., TIAN, X. F., HOU, H. L., & WANG, Y. Q. (2008). Influence of hydrogenation on microstructures and microhardness of Ti6Al4V alloy. Transactions of Nonferrous Metals Society of China (English Edition), 18(3), 506-511. doi:10.1016/S1003-6326(08)60089-8

Scopus Eid


  • 2-s2.0-44449097074

Start Page


  • 506

End Page


  • 511

Volume


  • 18

Issue


  • 3