Accounting for Climb and Cross-slip in the Crystal Plasticity of Non-Cubic Metals

考虑非立方金属晶体塑性中的爬升和横向滑移

基本信息

  • 批准号:
    1810197
  • 负责人:
  • 金额:
    $ 41.26万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Continuing Grant
  • 财政年份:
    2018
  • 资助国家:
    美国
  • 起止时间:
    2018-07-01 至 2024-06-30
  • 项目状态:
    已结题

项目摘要

NON-TECHNICAL DESCRIPTION: Metal alloys with atypical crystal structures (atomic arrangements) exhibit key properties that enable them to be employed in a wide range of advanced technologies that contribute to environmental protection (lead-free tin-based solders); energy conservation through transportation weight reduction (magnesium (Mg) and titanium alloys); and energy production via nuclear technology (zirconium alloys). The current research focuses on lightweight Mg metal deformation, which is of interest to the automotive, aerospace, and defense industries. The research (including both experimental activities and computational modeling) provides insights into improved design and manufacture for these applications. Students involved in this research find employment within the materials, automotive or aerospace manufacturing sectors, and some go on to research careers which serve the nation's interests in energy, defense, or education. An outreach program seeks to develop enthusiasm for materials science, and science and engineering more generally in local elementary school students in Charlottesville and the surrounding rural area. Within this program, the role of strong, yet light-weight materials is demonstrated in efficient transportation - from the Wright brothers' first flight to modern vehicles, like Tesla electric cars and drones. TECHNICAL DETAILS: The objective of the proposed research is to determine the degree to which dislocation climb and cross-slip accommodate strain during the polycrystal plasticity of non-cubic metals. Lightweight Mg and its alloys are selected for this study because of the world-wide interest in increasing the efficiency of transportation as well as the scientific convenience that the near-thermo-elastic isotropy of Mg crystals simplifies the analysis of plastic anisotropy. Textured samples of pure Mg and commercial alloys will be tested under creep and stress-relaxation conditions along different directions with respect to the initial texture. While there is already published data for these materials, a controversy regarding the roles of cross-slip and climb remains. Quantitative accounting for the effect of initial texture, various dislocation types (with a, c, and c+a Burgers vectors), as well as the evolution of the dislocation substructure (largely unstudied in non-cubic materials) will settle the issue. The approach is multi-scale, addressing the macroscale, mesoscale and microscale. MACROSCALE creep and stress relaxation experiments are performed on textured polycrystalline samples, and texture evolution and strain anisotropy are measured on samples crept to significant strain levels. The results of macroscale experiments guide selection of specific stress and temperature conditions to explore with meso- and micro-scale characterization. A new technique known as in situ high energy X-ray diffraction (HEXD) reveals the MESOSCALE distribution of full stress tensors and dislocation contents (including the densities of different types, Burgers vector and line direction) within individual grains of a polycrystal. Information that was previously relegated to single crystal experiments or very small numbers of grains in a polycrystal has only recently become available for statistically significant numbers (hundreds) of grains within polycrystals, and a new polycrystal plasticity model, which accounts for dislocation climb, is used to interpret the HEXD data. Finally, X-ray diffraction line profile analysis and transmission electron microscopy (including in situ straining) experiments elucidate the MICROSCALE dislocation densities, reveal critical dislocation configurations and their kinetic descriptions in terms of specific thermally activated unit processes. The interpretation of the results is aided by discrete dislocation dynamics (DDD) simulation, used to explore the effects of these dislocation ensembles and how they recover. Graduate students are trained in advanced experimental characterization and modeling techniques. With guidance, undergraduate students also perform some of the experiments and analyses, especially at the macroscale.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.
非技术描述:具有非典型晶体结构(原子排列)的金属合金具有关键特性,使其能够用于各种先进技术,这些技术有助于环境保护(无铅锡基焊料);通过减轻运输重量实现节能(镁(Mg)和钛合金);以及通过核技术生产能源(锆合金)。目前的研究重点是轻质镁金属变形,这是感兴趣的汽车,航空航天和国防工业。这项研究(包括实验活动和计算建模)为这些应用的改进设计和制造提供了见解。参与这项研究的学生在材料,汽车或航空航天制造部门找到工作,有些人继续从事为国家在能源,国防或教育方面的利益服务的研究事业。一个推广计划旨在培养夏洛茨维尔和周边农村地区当地小学生对材料科学、科学和工程的热情。在这个项目中,坚固而轻质的材料在高效运输中的作用得到了证明-从莱特兄弟的第一次飞行到特斯拉电动汽车和无人机等现代车辆。技术规格:提出的研究的目的是确定在何种程度上的位错攀移和交叉滑移容纳应变在多晶塑性的非立方金属。轻质镁及其合金被选择用于这项研究,因为世界范围内的兴趣,提高运输效率,以及科学的方便,镁晶体的近热弹性各向同性简化了塑性各向异性的分析。纯镁和商业合金的织构样品将在蠕变和应力松弛条件下沿相对于初始织构的沿着不同方向进行测试。虽然已经有这些材料的公开数据,但关于交叉滑动和爬升的作用仍然存在争议。定量解释初始织构的影响,各种位错类型(a,c和c+a Burgers矢量),以及位错亚结构的演变(在非立方材料中基本上未研究)将解决这个问题。该方法是多尺度的,涉及宏观尺度、中尺度和微观尺度。宏观蠕变和应力松弛实验进行织构多晶样品,和织构演变和应变各向异性测量样品蠕变到显着的应变水平。宏观实验的结果指导选择特定的应力和温度条件,以探索中尺度和微观尺度的表征。原位高能X射线衍射(HEXD)是一种新的测量方法,它揭示了多晶体中单个晶粒内全应力张量和位错含量(包括不同类型的密度、Burgers矢量和线方向)的中尺度分布。以前被降级到单晶实验或非常小数量的晶粒在多晶体的信息最近才成为可用于统计上显着的数量(数百)的晶粒内的多晶体,和一个新的多晶体塑性模型,占位错爬升,是用来解释的HEXD数据。最后,X射线衍射线轮廓分析和透射电子显微镜(包括原位应变)实验阐明微观位错密度,揭示临界位错配置和它们的动力学描述在特定的热激活单元过程。结果的解释是辅助离散位错动力学(DDD)模拟,用于探索这些位错合奏的影响,以及它们如何恢复。研究生接受高级实验表征和建模技术的培训。在指导下,本科生也进行一些实验和分析,特别是在宏观尺度上。该奖项反映了NSF的法定使命,并通过使用基金会的智力价值和更广泛的影响审查标准进行评估,被认为值得支持。

项目成果

期刊论文数量(4)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
An Investigation into the Role of Dislocation Climb During Intermediate Temperature Flow of Mg Alloys
  • DOI:
    10.1007/978-3-030-36647-6_19
  • 发表时间:
    2020
  • 期刊:
  • 影响因子:
    0
  • 作者:
    M. Ritzo;J. Bhattacharyya;R. Lebensohn;S. Agnew
  • 通讯作者:
    M. Ritzo;J. Bhattacharyya;R. Lebensohn;S. Agnew
Accounting for the effect of dislocation climb-mediated flow on the anisotropy and texture evolution of Mg alloy, AZ31B
  • DOI:
    10.1016/j.msea.2021.142581
  • 发表时间:
    2021-12
  • 期刊:
  • 影响因子:
    0
  • 作者:
    M. Ritzo;R. Lebensohn;L. Capolungo;S. Agnew
  • 通讯作者:
    M. Ritzo;R. Lebensohn;L. Capolungo;S. Agnew
Thermally Activated Slip in Rare Earth Containing Mg-Mn-Ce Alloy, ME10, Compared with Traditional Mg-Al-Zn Alloy, AZ31
  • DOI:
    10.1007/s11837-018-3310-5
  • 发表时间:
    2019-01
  • 期刊:
  • 影响因子:
    2.6
  • 作者:
    Vikaas Bajikar;J. Bhattacharyya;N. Peterson;S. Agnew
  • 通讯作者:
    Vikaas Bajikar;J. Bhattacharyya;N. Peterson;S. Agnew
(2021) Accounting for the Effects of Dislocation Climb Mediated Flow in Mg Alloy ZK10 Sheet. In: Miller V.M., Maier P., Jordon J.B., Neelameggham N.R. (eds) . The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-030-65528
(2021) 考虑镁合金 ZK10 板材中位错爬移介导流动的影响。
  • DOI:
    10.1007/978-3-030-65528-0_6
  • 发表时间:
    2021
  • 期刊:
  • 影响因子:
    0
  • 作者:
    Ritzo, Michael A.;Agnew, Sean R.
  • 通讯作者:
    Agnew, Sean R.
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Sean Agnew其他文献

Corrosion of Magnesium in Multimaterial System
  • DOI:
    10.1007/s11837-017-2520-6
  • 发表时间:
    2017-08-16
  • 期刊:
  • 影响因子:
    2.300
  • 作者:
    Vineet V. Joshi;Sean Agnew
  • 通讯作者:
    Sean Agnew
Dislocation density measurements on Mg alloys reveal surprising temperature dependences
对镁合金的位错密度测量揭示了令人惊讶的温度依赖性。
  • DOI:
    10.1016/j.actamat.2025.121273
  • 发表时间:
    2025-09-01
  • 期刊:
  • 影响因子:
    9.300
  • 作者:
    Michael Ritzo;Jishnu Bhattacharyya;Péter Nagy;Gergely Farkas;Jenő Gubicza;Kristián Máthis;Sean Agnew
  • 通讯作者:
    Sean Agnew

Sean Agnew的其他文献

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{{ truncateString('Sean Agnew', 18)}}的其他基金

DMREF/Collaborative Research: Low Cost, High Strength and Ductile Mg Alloys
DMREF/合作研究:低成本、高强度和延展性镁合金
  • 批准号:
    1921926
  • 财政年份:
    2020
  • 资助金额:
    $ 41.26万
  • 项目类别:
    Standard Grant
Designing Materials to Revolutionize and Engineer our Future (DMREF) Grantees' Workshop; Arlington, Virginia; September 8 - 10, 2013
设计材料以彻底改变和设计我们的未来 (DMREF) 受助者研讨会;
  • 批准号:
    1352571
  • 财政年份:
    2013
  • 资助金额:
    $ 41.26万
  • 项目类别:
    Standard Grant
DMREF/Collaborative Research: Multi-Scale Modeling and Characterization of Twinning-Induced Plasticity and Fracture in Magnesium Alloys
DMREF/合作研究:镁合金中孪生塑性和断裂的多尺度建模和表征
  • 批准号:
    1235259
  • 财政年份:
    2012
  • 资助金额:
    $ 41.26万
  • 项目类别:
    Standard Grant
Workshop: Magnesium Alloys Science and Technology - Fundamental Research Issues; Arlington, Virginia; May 19-20, 2011
研讨会:镁合金科学与技术——基础研究问题;
  • 批准号:
    1121133
  • 财政年份:
    2011
  • 资助金额:
    $ 41.26万
  • 项目类别:
    Standard Grant
Materials World Network: Developing a New Mg Alloy with Optimized Texture for Enhanced Formability
材料世界网络:开发一种具有优化织构以增强成型性的新型镁合金
  • 批准号:
    0603066
  • 财政年份:
    2006
  • 资助金额:
    $ 41.26万
  • 项目类别:
    Continuing Grant
CAREER: Understanding the Anomalous Ductility of Select B2 Intermetallic Compounds: Polycrystal Plasticity Modeling and Validation by In-Situ Diffraction Techniques
职业:了解精选 B2 金属间化合物的反常延展性:通过原位衍射技术进行多晶塑性建模和验证
  • 批准号:
    0547981
  • 财政年份:
    2006
  • 资助金额:
    $ 41.26万
  • 项目类别:
    Continuing Grant
Collaborative Research: Interdisciplinary Investigation of Warm Forming of Magnesium Alloy Sheet
合作研究:镁合金板材温成形的跨学科研究
  • 批准号:
    0322917
  • 财政年份:
    2003
  • 资助金额:
    $ 41.26万
  • 项目类别:
    Continuing Grant

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  • 批准号:
    2349168
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    2024
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  • 批准号:
    10707161
  • 财政年份:
    2022
  • 资助金额:
    $ 41.26万
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The Center for Label-free Imagingand Multiscale Biophotonics (CLIMB)
无标记成像和多尺度生物光子学中心 (CLIMB)
  • 批准号:
    10705169
  • 财政年份:
    2022
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无标记成像和多尺度生物光子学中心 (CLIMB)
  • 批准号:
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  • 财政年份:
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