2013 Fiscal Year Final Research Report
Development of the evaluation method for the effect of stress gradient on mass diffusion
| Project/Area Number |
24760080
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Materials/Mechanics of materials
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| Research Institution | Saga University |
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Principal Investigator |
TAKETOMI Shinya 佐賀大学, 工学(系)研究科(研究院), 准教授 (20608096)
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| Project Period (FY) |
2012-04-01 – 2014-03-31
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| Keywords | 水素拡散 / 水素脆化 / 分子動力学 / 分子静力学 / 水素マイクロプリント法 |
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| Research Abstract |
Diffusion is one of the fundamental process for several kind of engineering problems. For example, hydrogen atoms diffuse/accumulate under the gradients of hydrogen concentration and stress in metal. These diffusion process finally result in the lowering of mechanical properties which is known as hydrogen embrittlement. In order to predict these diffusion phenomena, development of analysis method in high resolution should be pivotal. In this study, we performed the evaluation of diffusion coefficient based on atomistic simulations and experiments using hydrogen micro-print technique. Atomistic simulations show the diffusion coefficients could be changed depending on the stress gradients. Furthermore, experimentally confirmed that the sham diffusion coefficient becomes large under the stress gradient conditions.
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