Effects of Boron on the Surface Chemistry of Single Crystal Ni3 (Al, Ti)
硼对单晶 Ni3 (Al, Ti) 表面化学的影响
基本信息
- 批准号:9713052
- 负责人:
- 金额:$ 26.46万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Continuing Grant
- 财政年份:1997
- 资助国家:美国
- 起止时间:1997-09-01 至 2001-05-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
9713052 Chung Past research has demonstrated that a major role of boron in ductilizing intermetallic alloys, such as Ni3Al, is to suppress moisture-induced embrittlement. It is generally agreed that the embrittlement arises from the diffusion of atomic hydrogen to the crack tip and that the atomic hydrogen is produced from the chemical reaction between the water vapor and the freshly exposed intermetallic surfaces. The mechanism by which the boron suppresses the embrittlement process has not been explored in detail. This project examines three physical and chemical effects of boron on the surface reactivity of single crystal Ni3(Al,Ti) surfaces towards water vapor, viz. (1) physical site blocking; (2) formation of surface hydroxyls in the presence of oxygen; and (3) modification of the relative rates of hydrogen desorption and surface diffusion. To understand a recent surprising finding that boron-doped Ni3Al is less ductile than boron-free Ni3Al in dry hydrogen, the dissociation of hydrogen on Ni3(Al,Ti) surfaces is investigated. These studies are performed in situ as a function of boron surface concentration and temperature using primarily x-ray photoemission and thermal desorption on single crystal Ni3(Al,Ti) (100) and (111) surfaces. Controlled dosing of boron is accomplished using a solid- state, low-energy boron ion source. %%% Nickel aluminide, Ni3Al, belongs to a class of aluminum- based intermetallics that are potentially valuable for high temperature structural applications. This work assists in understanding factors affecting the ductility of these alloys. ***
小行星9713052 过去的研究表明,硼在金属间化合物合金(如Ni 3Al)塑性化中的主要作用是抑制湿致脆化。 人们普遍认为,脆化是由于氢原子向裂纹尖端的扩散引起的,而氢原子是由水蒸气和新暴露的金属间表面之间的化学反应产生的。 硼抑制脆化过程的机制尚未详细探讨。 本项目研究了硼对单晶Ni 3(Al,Ti)表面对水蒸气的表面反应性的三种物理和化学效应,即:(1)物理位阻;(2)在氧存在下形成表面羟基;(3)氢解吸和表面扩散的相对速率的改变。 为了理解最近的一个令人惊讶的发现,即硼掺杂的Ni 3Al在干氢中比无硼的Ni 3Al延展性差,研究了氢在Ni 3(Al,Ti)表面上的解离。 这些研究是在原位进行的,作为硼表面浓度和温度的函数,主要使用X射线光电子能谱和热解吸单晶Ni 3(Al,Ti)(100)和(111)表面。 使用固态、低能硼离子源实现硼的受控剂量。 %镍铝化物Ni 3Al属于一类铝基金属间化合物,其对于高温结构应用具有潜在价值。 这项工作有助于了解影响这些合金的延展性的因素。 ***
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Yip-Wah Chung其他文献
Comments on “On the Correlation Between Mechanical Degradation of Lubricating Grease and Entropy”, by A. Rezasoltani and M. M. Khonsari, Tribology Letters 56, 197–204 (2014)
- DOI:
10.1007/s11249-015-0584-4 - 发表时间:
2015-09-04 - 期刊:
- 影响因子:3.300
- 作者:
Yip-Wah Chung - 通讯作者:
Yip-Wah Chung
Mechanical properties of amorphous carbon nitride thin films prepared by reactive magnetron sputter-deposition
- DOI:
10.1007/bf00157978 - 发表时间:
1995-06-01 - 期刊:
- 影响因子:3.300
- 作者:
Dong Li;Yip-Wah Chung;Ming-Show Wong;William D. Sproul - 通讯作者:
William D. Sproul
Surface deformation and crack initiation during fatigue of vacuum melted iron: Environmental effects
- DOI:
10.1007/bf02664825 - 发表时间:
1983-07-01 - 期刊:
- 影响因子:2.500
- 作者:
Debasis Majumdar;Yip-Wah Chung - 通讯作者:
Yip-Wah Chung
Process Design
- DOI:
10.2307/j.ctv15wxptd.7 - 发表时间:
2019-05 - 期刊:
- 影响因子:0
- 作者:
Yip-Wah Chung - 通讯作者:
Yip-Wah Chung
Thermal evaluation of TiN/CN<sub><em>x</em></sub> multilayer films
- DOI:
10.1016/j.matchemphys.2011.09.042 - 发表时间:
2011-12-15 - 期刊:
- 影响因子:
- 作者:
Mônica de Mesquita Lacerda;Júlio Miranda Pureza;José Fernando Fragalli;Ney Mattoso Filho;Yip-Wah Chung - 通讯作者:
Yip-Wah Chung
Yip-Wah Chung的其他文献
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{{ truncateString('Yip-Wah Chung', 18)}}的其他基金
On-demand Generation of Diamond-like-carbon Layers for Efficient Lubrication of Mechanical Systems
按需生成类金刚石碳层,以实现机械系统的高效润滑
- 批准号:
1662606 - 财政年份:2017
- 资助金额:
$ 26.46万 - 项目类别:
Standard Grant
MRI: Instrument Development: Additive Rapid Prototyping Instrument (ARPI)
MRI:仪器开发:增材快速原型仪器 (ARPI)
- 批准号:
1429658 - 财政年份:2014
- 资助金额:
$ 26.46万 - 项目类别:
Standard Grant
MRI: Development of a State-of-the-Art Laser Micro-machining and Surface Engineering System
MRI:开发最先进的激光微加工和表面工程系统
- 批准号:
0923000 - 财政年份:2009
- 资助金额:
$ 26.46万 - 项目类别:
Standard Grant
Workshop on Energy Efficiency via Better Materials and Manufacturing; June 18-19, 2009
通过更好的材料和制造提高能源效率研讨会;
- 批准号:
0901256 - 财政年份:2009
- 资助金额:
$ 26.46万 - 项目类别:
Standard Grant
NSF Summer Institute on Nano-Mechanics, Nano-Materials and Micro/Nano-Manufacturing
NSF 纳米力学、纳米材料和微/纳米制造夏季研究所
- 批准号:
0727027 - 财政年份:2007
- 资助金额:
$ 26.46万 - 项目类别:
Standard Grant
Building a State-of-the-Art Laser-Based Surface-Texturing Instrument
构建最先进的基于激光的表面纹理仪器
- 批准号:
0619284 - 财政年份:2006
- 资助金额:
$ 26.46万 - 项目类别:
Standard Grant
Synthesis of Hard and Lubricious Carbon-Based Nanolayer and Nanocomposite Coatings
坚硬润滑的碳基纳米层和纳米复合涂层的合成
- 批准号:
0625512 - 财政年份:2006
- 资助金额:
$ 26.46万 - 项目类别:
Standard Grant
Development and Tribological Studies of Nanocrystalline Carbon Nitride Superhard Coatings Rivaling Diamond
媲美金刚石的纳米晶碳氮化物超硬涂层的开发与摩擦学研究
- 批准号:
9520635 - 财政年份:1995
- 资助金额:
$ 26.46万 - 项目类别:
Standard Grant
Role of Competitive Surface Chemical Reactions in Ductility of Intermetallics
竞争性表面化学反应在金属间化合物延展性中的作用
- 批准号:
9410701 - 财政年份:1994
- 资助金额:
$ 26.46万 - 项目类别:
Continuing Grant
Synthesis and Tribological Characterization of Novel Superhard Coatings of Corbin Nitride
Corbin氮化物新型超硬涂层的合成及摩擦学表征
- 批准号:
9203239 - 财政年份:1992
- 资助金额:
$ 26.46万 - 项目类别:
Standard Grant
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