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Electron microscopy study of different stages of oxidation of Ti‐47Al‐2Nb‐2Cr‐0.15B and Ti‐45Al‐15Nb at 900°C
Author(s) -
LU W.,
CHEN C.,
HE L.,
WANG F.
Publication year - 2008
Publication title -
journal of microscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.569
H-Index - 111
eISSN - 1365-2818
pISSN - 0022-2720
DOI - 10.1111/j.1365-2818.2008.02023.x
Subject(s) - alloy , materials science , layer (electronics) , volume fraction , phase (matter) , electron microscope , nitride , metallurgy , chemical engineering , composite material , chemistry , optics , physics , organic chemistry , engineering
Summary The initial stage of oxidation of Ti‐47Al‐2Nb‐2Cr‐0.15B and Ti‐45Al‐15Nb alloys was studied. Studies reveal that the X and NbCr 2 phases will form in advance in the transition layer of the 2Nb2Cr alloy compared with the 15Nb alloy. The adherence between the nitride layer and underling layer is good. However, an obvious boundary exists between the mixed layer and the inner layer. The recrystallizing of the base alloy leads to an increase of the volume fraction of grain boundaries that can increase the oxidation rate at the initial oxidation stage. An Nb‐based compound forms in the transition layer, which can prevent the formation of X phase.