2005年1月
Grain boundary decohesion by impurity segregation in a nickel-sulfur system
SCIENCE
- ,
- ,
- 巻
- 307
- 号
- 5708
- 開始ページ
- 393
- 終了ページ
- 397
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1126/science.1104624
- 出版者・発行元
- AMER ASSOC ADVANCEMENT SCIENCE
The sulfur-induced embrittlement of nickel has long been wrapped in mystery as to why and how sulfur weakens the grain boundaries of nickel and why a critical intergranular sulfur concentration is required. From first-principles calculations, we found that a large grain-boundary expansion is caused by a short-range overlap repulsion among densely segregated and neighboring sulfur atoms. This expansion results in a drastic grain-boundary decohesion that reduces the grain-boundary tensile strength by one order of magnitude. This decohesion may directly cause the embrittlement, because the critical sulfur concentration of this decohesion agrees well with experimental data on the embrittlement.
- リンク情報
- ID情報
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- DOI : 10.1126/science.1104624
- ISSN : 0036-8075
- ORCIDのPut Code : 37661463
- Web of Science ID : WOS:000226492300037