Experimental and Theoretical Investigations of Gum Metal
胶质金属的实验和理论研究
基本信息
- 批准号:1105081
- 负责人:
- 金额:$ 42万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Continuing Grant
- 财政年份:2011
- 资助国家:美国
- 起止时间:2011-09-15 至 2014-08-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
TECHNICAL SUMMARY: Gum metals are Ti-Nb based alloys that display remarkable mechanical properties, including super-elasticity, super-strength, large ductility, zero coefficient of thermal expansion and elastic constants that remain constant over a range of temperatures. Surprisingly, plasticity in these materials appears to be mediated neither by dislocation motion nor by phase transformation. Instead, these materials appear to deform at their ideal strength. If so, these alloys represent a new type of structural alloy. Their unusual mechanical behavior is linked to a strong elastic anisotropy that develops as the composition of the alloy is driven towards a phase transformation. This anisotropy allows for easy dislocation pinning, the extreme spreading of the dislocation cores, and plays a role in the suppression of phase transformations that might otherwise weaken the alloys. The project involves two primary goals. First it aims to understand experimentally the precise mechanism governing plasticity in these unusual alloys. This understanding will be developed using a combination of nanoindentation and transmission electron microscopy experiments. Second, the project will develop theoretical tools and ideas capable of explaining the observed deformation behavior. Initial theoretical studies will focus on the structure of dislocations within Gum Metals paying particular attention to the implications of spread dislocation cores and dislocation core overlap. The understanding so obtained will be used to identify new alloys systems with the potential to deform similarly to Gum Metals.NON-TECHNICAL SUMMARY: The ideal strength of a material is the largest possible load the material can withstand before becoming permanently deformed. Typically, the observed strength of a material is 1/100th or less of its ideal strength, largely because defects known as dislocations are able to move throughout the crystal at stresses well below the ideal strength. This understanding lies at the heart of modern metallurgy, and guides the development of most structural alloys. Gum Metal is a recently discovered Ti-Nb based alloy with a long list of remarkable mechanical properties. The most striking characteristic is that Gum Metal appears to deform at ideal strength via a unique dislocation-free deformation mechanism. The goal of this research is to identify and understand the deformation mechanism(s) that gives rise to the remarkable properties of Gum Metal, and to use this understanding to develop the metallurgical principles that govern Gum Metal behavior. These principles will then be used to search for new materials that display mechanical properties similar to Gum Metal. The identification of novel metallurgical principles has the potential to enable the development of a new class of structural materials. Such materials would impact a broad range of technologies including transportation and energy generation. Students working towards their doctoral degrees will conduct much of the research. Course materials geared toward introducing high school physics students to the discipline of materials science and engineering will be developed and exemplified by the role of structural materials in the sport of skateboarding---a sport popular with teenagers.
技术概要:胶质金属是Ti-Nb基合金,其显示出显著的机械性能,包括超弹性、超强度、大延展性、零热膨胀系数和在一定温度范围内保持恒定的弹性常数。 令人惊讶的是,在这些材料中的塑性似乎是介导的位错运动,也不是由相变。 相反,这些材料似乎在其理想强度下变形。 如果是这样的话,这些合金代表了一种新型的结构合金。它们不寻常的机械行为与强弹性各向异性有关,该各向异性随着合金的成分被驱动朝向相变而发展。 这种各向异性允许容易的位错钉扎,位错核心的极端扩展,并在抑制相变中发挥作用,否则可能会削弱合金。该项目涉及两个主要目标。 首先,它旨在通过实验了解这些不寻常合金中控制塑性的精确机制。 这种理解将开发使用纳米压痕和透射电子显微镜实验的组合。 其次,该项目将开发能够解释观察到的变形行为的理论工具和想法。 最初的理论研究将集中在橡胶金属内的位错结构,特别注意扩展位错核心和位错核心重叠的影响。由此获得的理解将用于识别具有类似于橡胶金属的变形潜力的新合金系统。非技术总结:材料的理想强度是材料在永久变形之前所能承受的最大可能载荷。通常,材料的观察强度是其理想强度的1/100或更小,主要是因为称为位错的缺陷能够在远低于理想强度的应力下在整个晶体中移动。 这种理解是现代冶金学的核心,并指导大多数结构合金的发展。 胶质金属是最近发现的具有一长串显著机械性能的Ti-Nb基合金。最显著的特征是,橡胶金属似乎通过独特的无位错变形机制在理想强度下变形。 本研究的目标是识别和理解产生胶质金属显着性能的变形机制,并利用这种理解来开发控制胶质金属行为的冶金原理。 这些原理将用于寻找显示类似于Gum Metal的机械性能的新材料。 新的冶金原理的识别有可能使一类新的结构材料的发展。这些材料将影响广泛的技术,包括运输和能源生产。 攻读博士学位的学生将进行大部分研究。面向高中物理学生介绍材料科学与工程学科的课程材料将被开发,并以滑板运动中结构材料的作用为例-青少年流行的运动。
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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Daryl Chrzan其他文献
MP34-06 INHIBITION OF NUCLEATION AND GROWTH OF CYSTINE CRYSTALS IN URINE
- DOI:
10.1016/j.juro.2015.02.1302 - 发表时间:
2015-04-01 - 期刊:
- 影响因子:
- 作者:
Daryl Chrzan;Krishna Ramaswamy;David Killilea;Tiffany Zee;Thomas Chi;Pankaj Kapahi;Arnold Kahn;Marshall Stoller - 通讯作者:
Marshall Stoller
Enhancing intrinsic ductility in VNbMoTaW high entropy alloy: A combinatorial investigation with experimental evaluation of theoretical predictions
提高 VNbMoTaW 高熵合金的固有延展性:结合理论预测的实验评估研究
- DOI:
10.1016/j.jmrt.2025.02.011 - 发表时间:
2025-03-01 - 期刊:
- 影响因子:6.600
- 作者:
Taohid Bin Nur Tuhser;Ian Stewart Winter;Daryl Chrzan;T. John Balk - 通讯作者:
T. John Balk
Daryl Chrzan的其他文献
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{{ truncateString('Daryl Chrzan', 18)}}的其他基金
DMREF: Discovery, Development, Design and Additive Manufacturing of Multi-Principal-Element Hexagonal-Close-Packed Structural Alloys
DMREF:多主元六方密排结构合金的发现、开发、设计和增材制造
- 批准号:
2324022 - 财政年份:2023
- 资助金额:
$ 42万 - 项目类别:
Standard Grant
SNM: Scalable Nanomanufacturing of 2D Electronic Materials and Devices Using Automated Exfoliation
SNM:使用自动剥离的二维电子材料和设备的可扩展纳米制造
- 批准号:
1636256 - 财政年份:2016
- 资助金额:
$ 42万 - 项目类别:
Standard Grant
Theoretical and Experimental Investigations of Gum Metal
胶质金属的理论与实验研究
- 批准号:
0706554 - 财政年份:2007
- 资助金额:
$ 42万 - 项目类别:
Continuing Grant
Dislocations, Plasticity, and Strain Hardening in Carbon Nanotubes
碳纳米管中的位错、塑性和应变硬化
- 批准号:
0528511 - 财政年份:2005
- 资助金额:
$ 42万 - 项目类别:
Standard Grant
CAREER: Linking the Atomic and Meso-Scales to Mechanical Properties: A Case Study of Ni3Al
职业:将原子和介观尺度与机械性能联系起来:Ni3Al 的案例研究
- 批准号:
9703427 - 财政年份:1997
- 资助金额:
$ 42万 - 项目类别:
Continuing Grant
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