TY - JOUR
T1 - Influence of Fe micro-alloying and TiB2 reinforcement on the corrosion behavior of high Nb-containing TiAl alloys
AU - Chen, Feng
AU - Liu, Baofei
AU - Wang, Nan
AU - Sun, Yangyang
AU - Ding, Jie
AU - Chang, Hui
AU - Zhou, Lian
N1 - Publisher Copyright:
© 2025
PY - 2025/8/1
Y1 - 2025/8/1
N2 - To investigate the corrosion behavior of high Nb-containing TiAl alloys, samples of Ti-45Al-8Nb, Ti-45Al-8Nb-0.5 wt% Fe, and Ti-45Al-8Nb-0.5 wt% Fe-2wt% TiB2 were fabricated via hot isostatic pressing (HIP). The effects of Fe micro-alloying and the combination of Fe micro-alloying with TiB2 reinforcement on the corrosion properties of TiAl alloys were explored. The results revealed that the introduction of Fe caused significant lattice distortion in the γ-TiAl phase, while the presence of TiB2 particles hindered the formation of a dense passive film on the sample surface. However, both Fe micro-alloying and TiB2 reinforcement led to a notable reduction in the size of lamellar colony and the width of lamellar layers. The surface of TiAl and TiAl-Fe samples after corrosion was affected by the layered morphology formed by the difference in corrosion resistance between TiAl and Ti3Al phases. The addition of Fe element reduced the number of corrosion pits, while TiAl-Fe-TiB2 was subjected to micro-galvanic corrosion near TiB2. The preferential corrosion area appeared, and there were flocculent and granular oxides. As a result, the corrosion current density of the sample decreased progressively from 1.42 × 10−7 A/cm2 to 1.05 × 10−7 A/cm2, and further to 9.86 × 10−8 A/cm2. Additionally, the corrosion potential exhibited an anodic shift, increasing from −0.27 V to −0.11 V, and further to −0.09 V, indicating a significant enhancement in the corrosion resistance of the material. This combined effect of lattice distortion and grain refinement was found to impede the diffusion of Cl- ions, significantly enhancing the formation rate of the passive film.
AB - To investigate the corrosion behavior of high Nb-containing TiAl alloys, samples of Ti-45Al-8Nb, Ti-45Al-8Nb-0.5 wt% Fe, and Ti-45Al-8Nb-0.5 wt% Fe-2wt% TiB2 were fabricated via hot isostatic pressing (HIP). The effects of Fe micro-alloying and the combination of Fe micro-alloying with TiB2 reinforcement on the corrosion properties of TiAl alloys were explored. The results revealed that the introduction of Fe caused significant lattice distortion in the γ-TiAl phase, while the presence of TiB2 particles hindered the formation of a dense passive film on the sample surface. However, both Fe micro-alloying and TiB2 reinforcement led to a notable reduction in the size of lamellar colony and the width of lamellar layers. The surface of TiAl and TiAl-Fe samples after corrosion was affected by the layered morphology formed by the difference in corrosion resistance between TiAl and Ti3Al phases. The addition of Fe element reduced the number of corrosion pits, while TiAl-Fe-TiB2 was subjected to micro-galvanic corrosion near TiB2. The preferential corrosion area appeared, and there were flocculent and granular oxides. As a result, the corrosion current density of the sample decreased progressively from 1.42 × 10−7 A/cm2 to 1.05 × 10−7 A/cm2, and further to 9.86 × 10−8 A/cm2. Additionally, the corrosion potential exhibited an anodic shift, increasing from −0.27 V to −0.11 V, and further to −0.09 V, indicating a significant enhancement in the corrosion resistance of the material. This combined effect of lattice distortion and grain refinement was found to impede the diffusion of Cl- ions, significantly enhancing the formation rate of the passive film.
KW - Composites
KW - Electrochemical corrosion
KW - Lamellar microstructure
KW - Polarization
KW - TiAl alloy
UR - http://www.scopus.com/inward/record.url?scp=105002908976&partnerID=8YFLogxK
U2 - 10.1016/j.corsci.2025.112962
DO - 10.1016/j.corsci.2025.112962
M3 - 文章
AN - SCOPUS:105002908976
SN - 0010-938X
VL - 252
JO - Corrosion Science
JF - Corrosion Science
M1 - 112962
ER -