Effects of boron on water dissociation and surface diffusivity of hydrogen on Ni3(Al,Ti)(110) single crystal surfaces

J. Wang; Y. W. Chung

doi:10.1016/S0966-9795(01)00010-3

Effects of boron on water dissociation and surface diffusivity of hydrogen on Ni₃(Al,Ti)(110) single crystal surfaces

J. Wang, Y. W. Chung^*

^*Corresponding author for this work

Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

12 Scopus citations

Abstract

The interaction between water vapor (D₂O) and boron-modified Ni₃(Al,Ti)(110) was investigated using temperature-programmed desorption and X-ray photoelectron spectroscopy. Boron dosing was performed using a solid-state boron ion source. Results showed that boron reacts with water to form hydroxyls at temperatures as low as 130 K. D₂ desorption occurs at ∼950 K from boron-modified Ni₃(Al,Ti)(110), indicating strong B-D bonding. Surface diffusion coefficients of atomic D, obtained from dissociation of water, on clean and boron-modified Ni₃(Al,Ti)(110) surfaces were measured at 270 K with electron-stimulated desorption. The surface diffusion coefficient of atomic D on 0.05 monolayer boron-modified surface is about 10 times smaller than that on the boron-free surface. This slower diffusion of atomic hydrogen may explain why boron improves the ductility of polycrystalline Ni₃Al in moist environments.

Original language	English (US)
Pages (from-to)	349-354
Number of pages	6
Journal	Intermetallics
Volume	9
Issue number	4
DOIs	https://doi.org/10.1016/S0966-9795(01)00010-3
State	Published - Apr 2001

Keywords

A. Nickel aluminides, based on NiAl
B. Brittleness and ductility
B. Diffusion
B. Environmental embrittlement
B. Surface properties

ASJC Scopus subject areas

Chemistry(all)
Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

Access to Document

10.1016/S0966-9795(01)00010-3

Cite this

@article{c54f24fd1e1b4f6dbeadac769d65ac6e,

title = "Effects of boron on water dissociation and surface diffusivity of hydrogen on Ni3(Al,Ti)(110) single crystal surfaces",

abstract = "The interaction between water vapor (D2O) and boron-modified Ni3(Al,Ti)(110) was investigated using temperature-programmed desorption and X-ray photoelectron spectroscopy. Boron dosing was performed using a solid-state boron ion source. Results showed that boron reacts with water to form hydroxyls at temperatures as low as 130 K. D2 desorption occurs at ∼950 K from boron-modified Ni3(Al,Ti)(110), indicating strong B-D bonding. Surface diffusion coefficients of atomic D, obtained from dissociation of water, on clean and boron-modified Ni3(Al,Ti)(110) surfaces were measured at 270 K with electron-stimulated desorption. The surface diffusion coefficient of atomic D on 0.05 monolayer boron-modified surface is about 10 times smaller than that on the boron-free surface. This slower diffusion of atomic hydrogen may explain why boron improves the ductility of polycrystalline Ni3Al in moist environments.",

keywords = "A. Nickel aluminides, based on NiAl, B. Brittleness and ductility, B. Diffusion, B. Environmental embrittlement, B. Surface properties",

author = "J. Wang and Chung, {Y. W.}",

note = "Funding Information: This work is supported by the National Science Foundation, grant No. DMR 9713052.",

year = "2001",

month = apr,

doi = "10.1016/S0966-9795(01)00010-3",

language = "English (US)",

volume = "9",

pages = "349--354",

journal = "Intermetallics",

issn = "0966-9795",

publisher = "Elsevier Limited",

number = "4",

}

TY - JOUR

T1 - Effects of boron on water dissociation and surface diffusivity of hydrogen on Ni3(Al,Ti)(110) single crystal surfaces

AU - Wang, J.

AU - Chung, Y. W.

N1 - Funding Information: This work is supported by the National Science Foundation, grant No. DMR 9713052.

PY - 2001/4

Y1 - 2001/4

N2 - The interaction between water vapor (D2O) and boron-modified Ni3(Al,Ti)(110) was investigated using temperature-programmed desorption and X-ray photoelectron spectroscopy. Boron dosing was performed using a solid-state boron ion source. Results showed that boron reacts with water to form hydroxyls at temperatures as low as 130 K. D2 desorption occurs at ∼950 K from boron-modified Ni3(Al,Ti)(110), indicating strong B-D bonding. Surface diffusion coefficients of atomic D, obtained from dissociation of water, on clean and boron-modified Ni3(Al,Ti)(110) surfaces were measured at 270 K with electron-stimulated desorption. The surface diffusion coefficient of atomic D on 0.05 monolayer boron-modified surface is about 10 times smaller than that on the boron-free surface. This slower diffusion of atomic hydrogen may explain why boron improves the ductility of polycrystalline Ni3Al in moist environments.

AB - The interaction between water vapor (D2O) and boron-modified Ni3(Al,Ti)(110) was investigated using temperature-programmed desorption and X-ray photoelectron spectroscopy. Boron dosing was performed using a solid-state boron ion source. Results showed that boron reacts with water to form hydroxyls at temperatures as low as 130 K. D2 desorption occurs at ∼950 K from boron-modified Ni3(Al,Ti)(110), indicating strong B-D bonding. Surface diffusion coefficients of atomic D, obtained from dissociation of water, on clean and boron-modified Ni3(Al,Ti)(110) surfaces were measured at 270 K with electron-stimulated desorption. The surface diffusion coefficient of atomic D on 0.05 monolayer boron-modified surface is about 10 times smaller than that on the boron-free surface. This slower diffusion of atomic hydrogen may explain why boron improves the ductility of polycrystalline Ni3Al in moist environments.

KW - A. Nickel aluminides, based on NiAl

KW - B. Brittleness and ductility

KW - B. Diffusion

KW - B. Environmental embrittlement

KW - B. Surface properties

UR - http://www.scopus.com/inward/record.url?scp=0035311742&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0035311742&partnerID=8YFLogxK

U2 - 10.1016/S0966-9795(01)00010-3

DO - 10.1016/S0966-9795(01)00010-3

M3 - Article

AN - SCOPUS:0035311742

SN - 0966-9795

VL - 9

SP - 349

EP - 354

JO - Intermetallics

JF - Intermetallics

IS - 4

ER -