Collaborative Research: A Theoretical and Experimental Study of Mechanical Properties in Ultrafine-Grained Alloys

合作研究：超细晶合金力学性能的理论与实验研究

• 批准号: 1463656
• 负责人: Kiran Solanki
• 金额: $ 21.96万
• 依托单位: Arizona State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-07-01 至 2018-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1463656&HistoricalAwards=false
• 关键词: Collaborative; Research; Theoretical; Experimental; Study

Magnesium alloys are the lightest of all structural metallic materials, and are becoming of increasing interest due to their combination of low-density, moderate strength and stiffness, availability and recyclability. In particular, these properties are of direct relevance to the automobile, rail and aerospace industries that seek to replace heavier components with lighter ones, and thus minimize fuel usage. Despite the increased interest, magnesium alloys suffer from not being strong enough, and more so, that components have to be heated and shaped at very high temperatures, which is economically prohibitive for transportation manufacturers. This award supports fundamental research to acquire knowledge that will enable synergistic increases in strength and lowering of the processing temperature to ambient temperatures, thereby solving two important barriers to usage at one time. This research will intersect at the boundaries of materials science, mechanics and manufacturing in a highly relevant way. It will attract, educate and enable students from underrepresented groups to gain the knowledge and confidence to directly address the rigorous, evolving needs in U.S. industry and government for lightweight materials in energy efficient transportation. Cast magnesium alloys have suffered from poor ambient temperature plasticity due to the lack of necessary active slip systems. This problem is compounded in wrought processed alloys wherein highly anisotropic textures limit uniform material flow. On the other hand, nanocrystalline materials with grain sizes below 100nm have exceptional and desirable properties when compared to their course-grained counterparts, including concurrent increases in strength and ductility. Motivated by this, the goals of this project are 1) to uncover the underpinning mechanisms for ambient temperature plasticity in bulk, fully dense, nano-grained magnesium alloys using novel processing approaches and microstructure-based modeling; and 2) to exploit the subsequent knowledge to predictably design and fabricate low-temperature formable magnesium alloys. In terms of broader scientific ramifications, the development of a tractable and systematic experimental and modeling framework will represent a major advance over current semi-empirical methods for designing nano-grained alloys with tailored microstructures.

镁合金是所有结构金属材料中最轻的，并且由于其低密度、中等强度和刚度、可用性和可回收性的结合而越来越受到人们的关注。 特别是，这些特性与汽车、铁路和航空航天工业直接相关，这些工业寻求用较轻的部件替代较重的部件，从而最大限度地减少燃料的使用。尽管人们对镁合金的兴趣不断增加，但镁合金的强度不够，而且部件必须在非常高的温度下加热和成型，这对于运输制造商来说在经济上是昂贵的。该奖项支持基础研究以获得知识，从而协同提高强度并将加工温度降低至环境温度，从而同时解决两个重要的使用障碍。 这项研究将以高度相关的方式在材料科学、力学和制造的边界上交叉。 它将吸引、教育并帮助来自弱势群体的学生获得知识和信心，从而直接满足美国工业界和政府对节能交通领域轻质材料不断变化的严格需求。 由于缺乏必要的主动滑移系统，铸造镁合金的环境温度塑性较差。这个问题在锻造加工合金中更加复杂，其中高度各向异性的纹理限制了均匀的材料流动。另一方面，与粗晶粒材料相比，晶粒尺寸低于 100nm 的纳米晶材料具有优异且理想的性能，包括强度和延展性的同时增加。 受此启发，该项目的目标是：1）利用新颖的加工方法和基于微观结构的建模，揭示大块、全致密、纳米晶镁合金的环境温度塑性的基础机制； 2）利用后续知识以可预测的方式设计和制造低温可成型镁合金。就更广泛的科学影响而言，开发一个易于处理且系统的实验和建模框架将代表着相对于当前用于设计具有定制微观结构的纳米晶合金的半经验方法的重大进步。

项目成果

Towards dynamic tension-compression asymmetry and relative deformation mechanisms in magnesium

• DOI: 10.1016/j.mtla.2019.100543
• 发表时间: 2020-03
• 期刊: Materialia
• 影响因子: 3.4
• 作者: C. Kale;S. Turnage;D. Avery;H. El Kadiri;J. Jordon;K. Solanki

Solute Effect on Strength and Formability of Mg: A First-Principle Study

溶质对镁强度和成形性的影响：第一性原理研究

• 发表时间: 2017
• 期刊: metals & materials series
• 作者: Garg P., Bhatia M.A.

Effect of solutes on ideal shear resistance and electronic properties of magnesium: A first-principles study

• DOI: 10.1016/j.actamat.2018.05.014
• 发表时间: 2018-07-01
• 期刊: ACTA MATERIALIA
• 影响因子: 9.4
• 作者: Garg, P.;Adlakha, I;Solanki, K. N.
• 通讯作者: Solanki, K. N.

On the roles of stress-triaxiality and strain-rate on the deformation behavior of AZ31 magnesium alloys

• DOI: 10.1080/21663831.2017.1417923
• 发表时间: 2018-02
• 期刊: Materials Research Letters
• 影响因子: 8.3
• 作者: C. Kale;M. Rajagopalan;S. Turnage;B. Hornbuckle;K. Darling;S. Mathaudhu;K. Solanki