Roles of Crystal Defect and Solute Atom in Hydrogen-induced Embrittlement of Intermetallic Compounds
晶体缺陷和溶质原子在金属间化合物氢致脆化中的作用
基本信息
- 批准号:08455315
- 负责人:
- 金额:$ 4.99万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research (B)
- 财政年份:1996
- 资助国家:日本
- 起止时间:1996 至 1997
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Using Ni_3 (Si, Ti), Co_3Ti and Ni_3AI intermetallic compounds with Ll_2-type structure, the influence of the crystal defects such as grain boundaries, dislocations and vacancies, and also solutes such as interstitials, substitutionals and non-stoichiometric atoms has been observed in this study. The following results were obtained.1) It was shown that the grain boundaries in those intermetallic compounds play a role in providing hydrogen diffusion path and also offering hydrogen occupation sites, leading to the reduction of grain boundary cohesive strength and the associated ductility loss. On the other hand, the dislocations and vacancies were suggested to play a role in trapping hydrogen, and as a result, the hydrogen-induced embrittlement can be suppressed. Based on such principal finding, it was shown that the pre-deformation and the shot-peening have the effect of completely suppressing or reducing the environmental embrittlement of those intermetallic compounds.2) It was found that a trace amount of interstitials such as boron and carbon can dramatically suppress the environmental embrittlement of Ni_3 (Si, Ti) and Ni_3Al intermetallic compounds. As the possible mechanisms, it was suggested that such interstilials enrich at the grain boundaries, and block the migration and the condensation of hydrogen, reducing the environmental embrittlement. Also, some substitutional atoms and non-stoichiometric atoms were shown to have the effect of reducing the environmental embrittlement. The mechanisms responsible for such an alloying effect were discussed. Lastly, it was found that surface films having an adequate composition and structure are effective of reducing the environmental embrittlement of Ni_3 (Si, Ti) intermetallic compound.
本文以Ll_2型结构的Ni_3(Si,Ti),Co_3Ti和Ni_3Al金属间化合物为研究对象,观察了晶界、位错和空位等晶体缺陷以及杂质、替位原子和非化学计量比原子等溶质的影响。结果表明:1)金属间化合物中的晶界不仅提供氢的扩散通道,还提供氢的占位位置,导致晶界结合强度降低,塑性降低。另一方面,位错和空位被认为在捕获氢中起作用,并且因此,可以抑制氢致脆化。结果表明,预变形和喷丸处理对Ni_3(Si,Ti)和Ni_3Al金属间化合物的环境脆化有明显的抑制作用。2)微量的硼和碳等元素对Ni_3(Si,Ti)和Ni_3Al金属间化合物的环境脆化有明显的抑制作用。其可能的机制是,这些化合物在晶界富集,阻碍了氢的迁移和凝聚,降低了环境脆化。此外,一些替代原子和非化学计量比的原子被证明具有降低环境脆化的效果。对这种合金化效应的机理进行了讨论。最后,发现具有适当成分和结构的表面膜能有效地降低Ni_3(Si,Ti)金属间化合物的环境脆化。
项目成果
期刊论文数量(36)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
T.Takasugi: "Grain Boundary Brittleness, and Grain Boundary Structure and Chemistry of Ni_3Al Intermetallics" International Symposium on Nickel and Iron Aluminide ; Processing, Properties, and Applications, ed.by C.Deevi, V.K.Sikka, P.J.Maziasz and R.W.Ca
T.Takasugi:“晶界脆性、Ni_3Al金属间化合物的晶界结构和化学”国际镍铁铝化物研讨会;
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T.Takasugi: "Grain Boandary BriHleness,and Grain Boundary Slructure and chemistry of Ni_3Al Intermelallics" International Sympesium on Nickel and Iron Aluminide Processing,Propeil:es, and Appliations. 33-49 (1997)
T.Takasugi:“晶界硬度、晶界结构和 Ni_3Al 金属间化合物的化学”国际镍铁铝化物加工研讨会、Propeil:es 和应用。
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C. L. Ma: "Supplession of Environmental Embrittlement of Ni_3 (Si, Ti) Alloys by Shoto Peening" Scripta materialia. 34,7. 1131-1138 (1996)
C. L. Ma:“通过 Shoto 喷丸对 Ni_3 (Si, Ti) 合金的环境脆化进行补充”材料材料。
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- 影响因子:0
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T, Takasugi: "Grain Boundary Brittleness and Grain Boundery Structure and Chemistry of Ni_3Al Intermetallics" International symposium on Nickel and Iron Aluminide:Processing,Properlies,and Applications. 33-49 (1997)
T,Takasugi:“Ni_3Al金属间化合物的晶界脆性和晶界结构与化学”国际镍铁铝化物研讨会:加工、性能和应用。
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T, Takasugi: "Hydrogen Property in Lattice associated with the Embrittlement of Co_3Ti Alloys" Intermetalics. 5. 443-448 (1997)
T,Takasugi:“与 Co_3Ti 合金脆化相关的晶格中的氢特性”金属间化合物。
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TAKASUGI Takayuki其他文献
TAKASUGI Takayuki的其他文献
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{{ truncateString('TAKASUGI Takayuki', 18)}}的其他基金
Basic Research to Develop Dual Multi-phase Intermetallic Alloys as Next-generation Type Heat Resistant Materials
开发双多相金属间合金作为下一代耐热材料的基础研究
- 批准号:
21226016 - 财政年份:2009
- 资助金额:
$ 4.99万 - 项目类别:
Grant-in-Aid for Scientific Research (S)
Development and Application of Ni Base Dual Two-phase Intermetallic Alloys
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18360335 - 财政年份:2006
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Alloy Design and Microstructural Control in Ni-based Multi-Intermetallic In-situ Composite Materials
镍基多元金属间复合材料的合金设计与微观结构控制
- 批准号:
15360373 - 财政年份:2003
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$ 4.99万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Alloy Design of Ultra High-Tempreature and Ultra Environmental Resisitance insitu Cr_2X-Based Intermetallic Compound Composites
超高温、超耐环境原位Cr_2X基金属间化合物复合材料的合金设计
- 批准号:
11555173 - 财政年份:1999
- 资助金额:
$ 4.99万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
The Effect of Crystal Structure and Microstructure on the Hydrogen-Induced Embrittlement of Intermetallic Compounds
晶体结构和微观结构对金属间化合物氢致脆化的影响
- 批准号:
10650684 - 财政年份:1998
- 资助金额:
$ 4.99万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
Development of Cr_2Nb Intermetallic Compounds with High Fracture Toughness as Ultra High Temperature Structural Materials
高断裂韧性Cr_2Nb金属间化合物超高温结构材料的研制
- 批准号:
07555495 - 财政年份:1995
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$ 4.99万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Applications of Ni_3 (Si, Ti) Based Intermetallic Compounds to Chemical Parts, Heat Resistance and Wear Resistance Materials
Ni_3(Si,Ti)基金属间化合物在化工零件、耐热耐磨材料中的应用
- 批准号:
04555167 - 财政年份:1992
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$ 4.99万 - 项目类别:
Grant-in-Aid for Developmental Scientific Research (B)
Improvement of Toughness in B2-type Intermetallic Compounds
B2型金属间化合物韧性的提高
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01550544 - 财政年份:1989
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$ 4.99万 - 项目类别:
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Crstallographic Study on Optical Memory Alloys using Phase Transformation
利用相变进行光记忆合金的晶体学研究
- 批准号:
62550511 - 财政年份:1987
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$ 4.99万 - 项目类别:
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