Fundamental Understanding of Superplasticity in Nanocrystalline Metals
对纳米晶金属超塑性的基本理解
基本信息
- 批准号:9903321
- 负责人:
- 金额:$ 46.13万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Continuing Grant
- 财政年份:1999
- 资助国家:美国
- 起止时间:1999-09-01 至 2004-08-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
9903321MukherjeeExploring a combination of methods for producing nanocrystalline materials, this experimental program examines superplastic deformation of nanostructured metals and intermetallic alloys. Previous experimental investigations have revealed high flow stress, extensive strain hardening, and correlation between microstructural instability and superplasticity in nanostructured materials. A specially designed and instrumented tensile testing device has been constructed for conducting precision mechanical tests. The nanostructure existing before and after deformation is investigated using transmission electron microscopy, x-ray diffraction, differential scanning calorimetry and internal friction methods. The scientific goal is to correlate the microstructural information with the mechanical data obtained to improve theoretical models of superplasticity. Special emphasis is given to the difficulty of intragranular dislocation generation within the matrix of nanoscaled metals and its implication to slip accommodation processes in current models of superplasticity. The state of grain boundary structure and the role of grain boundary dislocations in the interface sliding process are examined as the grain size decreases to nanoscale dimensions. A related aspect is considered, whether an observed increase in superplastic strain rate and/or decrease in superplastic temperature with decreasing grain size are a general phenomenon.%%%This is a renewal proposal designed to gain fundamental understanding of superplasticity in nanocrystalline materials. The phenomenon of sliding along the grain interfaces is one of the dominant rheological characteristics in superplasticity. Ultrafine grained nanocrystalline materials contain a large density of interfaces and, therefore, offer a unique opportunity to study the structural state of grain boundaries and their role in superplasticity.***
探索生产纳米晶材料的方法组合,这个实验程序检查纳米结构金属和金属间合金的超塑性变形。先前的实验研究揭示了纳米结构材料的高流动应力、广泛的应变硬化以及微观结构不稳定性与超塑性之间的相关性。为进行精密力学试验,专门设计了一种仪器化的拉伸试验装置。采用透射电镜、x射线衍射、差示扫描量热法和内摩擦法研究了变形前后的纳米结构。科学目标是将微观结构信息与获得的力学数据联系起来,以改进超塑性的理论模型。特别强调了纳米金属基体中晶内位错产生的困难及其对当前超塑性模型中滑移调节过程的影响。当晶粒尺寸减小到纳米尺度时,研究了晶界结构状态和晶界位错在界面滑动过程中的作用。一个相关的方面被考虑,是否观察到的增加的超塑性应变率和/或降低的超塑性温度随着晶粒尺寸的减小是一个普遍现象。这是一个更新的提议,旨在获得对纳米晶材料超塑性的基本理解。沿晶界滑动现象是超塑性流变学的主要特征之一。超细晶纳米晶材料含有大密度的界面,因此为研究晶界的结构状态及其在超塑性中的作用提供了独特的机会
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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Amiya Mukherjee其他文献
The Ricci Flow Equation and Poincaré Conjecture
- DOI:
10.1007/978-81-322-2547-8_3 - 发表时间:
2015 - 期刊:
- 影响因子:0
- 作者:
Amiya Mukherjee - 通讯作者:
Amiya Mukherjee
Embedding Complex Projective Spaces in Euclidean Space
- DOI:
10.1112/blms/13.4.323 - 发表时间:
1981-07 - 期刊:
- 影响因子:0.9
- 作者:
Amiya Mukherjee - 通讯作者:
Amiya Mukherjee
Phase-dependent photoluminescence behavior of Cr-doped alumina phosphors
Cr掺杂氧化铝荧光粉的相依赖光致发光行为
- DOI:
10.1016/j.optmat.2013.01.022 - 发表时间:
2013-04 - 期刊:
- 影响因子:3.9
- 作者:
Chunfeng Hu;Shenghu Zhou;Amiya Mukherjee;Qing Huang - 通讯作者:
Qing Huang
Atiyah-Singer Index Theorem - An Introduction
Atiyah-Singer 指数定理 - 简介
- DOI:
- 发表时间:
2013 - 期刊:
- 影响因子:0
- 作者:
Amiya Mukherjee - 通讯作者:
Amiya Mukherjee
Bredon-Illman cohomology with local coefficients
具有局部系数的 Bredon-Illman 上同调
- DOI:
- 发表时间:
1996 - 期刊:
- 影响因子:0
- 作者:
Amiya Mukherjee;G. Mukherjee - 通讯作者:
G. Mukherjee
Amiya Mukherjee的其他文献
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{{ truncateString('Amiya Mukherjee', 18)}}的其他基金
Advanced Nanocrystalline Ceramic Matrix Composites with Improved Fracture Toughness: Processing, Characterization & Modeling
具有改进断裂韧性的先进纳米晶陶瓷基复合材料:加工、表征
- 批准号:
0700272 - 财政年份:2007
- 资助金额:
$ 46.13万 - 项目类别:
Standard Grant
Fundamental Understanding of Deformation Mechanisms in Nanocrystalline Superplasticity
纳米晶超塑性变形机制的基本理解
- 批准号:
0703994 - 财政年份:2007
- 资助金额:
$ 46.13万 - 项目类别:
Continuing Grant
Fundamental Understanding of Deformation Mechanisms in Nanocrystalline Superplasticity
纳米晶超塑性变形机制的基本理解
- 批准号:
0240144 - 财政年份:2003
- 资助金额:
$ 46.13万 - 项目类别:
Continuing Grant
Processing and Forming of Laminated Metal Composites
层压金属复合材料的加工和成型
- 批准号:
9615540 - 财政年份:1997
- 资助金额:
$ 46.13万 - 项目类别:
Continuing Grant
Fundamental Understanding of Superplasticity in Nanocrystalline Metals
对纳米晶金属超塑性的基本理解
- 批准号:
9630881 - 财政年份:1996
- 资助金额:
$ 46.13万 - 项目类别:
Continuing Grant
Microstructural Scales of Superplastic Flow: Experimental Study and Constitutive Modeling
超塑性流动的微观结构尺度:实验研究和本构模型
- 批准号:
9634179 - 财政年份:1996
- 资助金额:
$ 46.13万 - 项目类别:
Continuing Grant
An Investigation of Superplasticity in Nitride Ceramics
氮化物陶瓷超塑性的研究
- 批准号:
9314825 - 财政年份:1994
- 资助金额:
$ 46.13万 - 项目类别:
Continuing Grant
The Role of Interfaces in Superplasticity with Emphasis on Intermetallic Compounds
界面在超塑性中的作用,重点是金属间化合物
- 批准号:
9300217 - 财政年份:1993
- 资助金额:
$ 46.13万 - 项目类别:
Continuing Grant
Superplasticity in Intermetallic Compound
金属间化合物的超塑性
- 批准号:
9013337 - 财政年份:1990
- 资助金额:
$ 46.13万 - 项目类别:
Continuing Grant
High Temperature Creep Properties of Ordered Nickel-Aluminum Alloys
有序镍铝合金的高温蠕变性能
- 批准号:
8700583 - 财政年份:1987
- 资助金额:
$ 46.13万 - 项目类别:
Continuing Grant
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