Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 18    No. 3    June 2008

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Influence of hydrogenation on microstructures and microhardness of Ti6Al4V alloy
ZHAO Jing-wei(赵敬伟)1, DING Hua(丁 桦)1, ZHAO Wen-juan(赵文娟)1,TIAN Xue-feng(田学锋)1, HOU Hong-liang(侯红亮)2, WANG Yao-qi(王耀奇)2

1. School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China;2. Beijing Aeronautical Manufacturing Technology Research Institute, Beijing 100024, China

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.

 

Key words: Ti6Al4V alloy; hydrogenation; hydride; microhardness; defect; solution strengthening; diffusion

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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