Interstitial segregation has the potential to mitigate liquid metal embrittlement in iron
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In: Advanced materials, Vol. 35.2023, No. 28, 2211796, 08.04.2023.
Research output: Contribution to journal › Article › Research › peer-review
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TY - JOUR
T1 - Interstitial segregation has the potential to mitigate liquid metal embrittlement in iron
AU - Ahmadian, A.
AU - Scheiber, Daniel
AU - Zhou, Xuyang
AU - Gault, Baptiste
AU - Romaner, Lorenz
AU - Kamachali, Reza D.
AU - Ecker, Werner
AU - Dehm, Gerhard
AU - Liebscher, C.
PY - 2023/4/8
Y1 - 2023/4/8
N2 - The embrittlement of metallic alloys by liquid metals leads to catastrophic material failure and severely impacts their structural integrity. The weakening of grain boundaries (GBs) by the ingress of liquid metal and preceding segregation in the solid are thought to promote early fracture. However, the potential of balancing between the segregation of cohesion-enhancing interstitial solutes and embrittling elements inducing GB de-cohesion is not understood. Here, the mechanisms of how boron segregation mitigates the detrimental effects of the prime embrittler, zinc, in a Σ5 [001] tilt GB in α-Fe (4 at.% Al) is unveiled. Zinc forms nanoscale segregation patterns inducing structurally and compositionally complex GB states. Ab initio simulations reveal that boron hinders zinc segregation and compensates for the zinc-induced loss in GB cohesion. The work sheds new light on how interstitial solutes intimately modify GBs, thereby opening pathways to use them as dopants for preventing disastrous material failure.
AB - The embrittlement of metallic alloys by liquid metals leads to catastrophic material failure and severely impacts their structural integrity. The weakening of grain boundaries (GBs) by the ingress of liquid metal and preceding segregation in the solid are thought to promote early fracture. However, the potential of balancing between the segregation of cohesion-enhancing interstitial solutes and embrittling elements inducing GB de-cohesion is not understood. Here, the mechanisms of how boron segregation mitigates the detrimental effects of the prime embrittler, zinc, in a Σ5 [001] tilt GB in α-Fe (4 at.% Al) is unveiled. Zinc forms nanoscale segregation patterns inducing structurally and compositionally complex GB states. Ab initio simulations reveal that boron hinders zinc segregation and compensates for the zinc-induced loss in GB cohesion. The work sheds new light on how interstitial solutes intimately modify GBs, thereby opening pathways to use them as dopants for preventing disastrous material failure.
U2 - 10.1002/adam.202211796
DO - 10.1002/adam.202211796
M3 - Article
VL - 35.2023
JO - Advanced materials
JF - Advanced materials
SN - 0935-9648
IS - 28
M1 - 2211796
ER -
