Ultrafine-grained Magnesium Alloys Manufactured by Multi-axial Forging: Elucidating Mechanisms of Achieving Both High Strength and High Ductility

多轴锻造制造超细晶镁合金：阐明实现高强度和高延展性的机制

• 批准号: 2130586
• 负责人: Devesh Misra
• 金额: $ 44.24万
• 依托单位: University of Texas at El Paso
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-02-15 至 2026-01-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2130586&HistoricalAwards=false
• 关键词: Ultrafine; grained; Magnesium; Alloys; Manufactured

Magnesium alloys exhibit a number of attractive properties including high specific strength and specific stiffness, good damping and shock absorbing capacity, and high thermal conductivity, etc., appealing for the use in automobile, aerospace, and packaging industries. However, thermo-mechanical processing of high-strength magnesium alloys is a challenge because of the inherent atomic-scale structure, which makes them difficult to plastically deform into high performance products at normal temperatures. This award addresses the challenge in processing of advanced high-strength magnesium-based alloys by fundamental research of the multi-axial forging process at high temperatures to attain scientific understanding of the process-structure-property relationship in complex metal deforming behaviors. The research has a potential to accelerate the pace of deployment of magnesium alloys and to promote cost-effective lightweight structure manufacture, allowing, for example, thinner sections or components to achieve better fuel economy in the transportation sector. In this project, graduate and undergraduate students will be trained in advanced manufacturing science and the processing concepts will also be integrated in the existing manufacturing curriculum. Furthermore, hosting of advanced manufacturing open house on the Engineering Day and Career Days on campus will foster awareness of advanced manufacturing career pathways in middle and high school students.The research objective of this project is to understand advanced processing concepts associated with multi-axial forging, in a sequential manner, in fabricating lightweight magnesium alloys with ultrafine grains that are characterized by a combination of very high strength in conjunction with high ductility. The process-structure-property study of multi-axial forging, by changing the strain per pass, will address the critical issue of texture-related anisotropy in magnesium alloys through elucidating the relationship between the orientation dependence of grains and the grain boundary character distribution that affect the mechanical properties and deformation mechanisms. In addition, the mechanistic basis of high ductility in high strength magnesium alloys will be unraveled through the discovery of quantitative relationship between the orientation distribution of grains and the plasticity mechanisms in a relatively wide grain-structure spectrum from ultrafine-grained to coarse-grained structures. This will be accomplished by studying the dependence of strains per pass on the formability of magnesium alloy by combining nanoindentation experiments with electron back scattered diffraction and post-mortem electron microscopy of deformed grains. Moreover, a machine learning approach for a quantitative relationship between the orientation distribution of grains and the ductility as a function of the strain per pass is envisaged to accelerate the processing of magnesium-based alloys.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.

镁合金具有比强度和比刚度高、阻尼减震能力好、导热系数高等优点，在汽车、航空航天、包装等行业具有广泛的应用前景。然而，由于固有的原子尺度结构，高强度镁合金的热机械加工是一个挑战，这使得它们很难在常温下塑性变形为高性能产品。该奖项通过高温多轴锻造工艺的基础研究来解决先进高强度镁基合金加工的挑战，以获得对复杂金属变形行为中工艺-结构-性能关系的科学理解。该研究有可能加快镁合金的部署步伐，并促进具有成本效益的轻质结构制造，例如，允许更薄的截面或部件，以在运输领域实现更好的燃油经济性。在该项目中，研究生和本科生将接受先进制造科学的培训，加工概念也将融入现有的制造课程中。此外，在校园工程日和职业日举办先进制造开放日活动，将提高中学生对先进制造职业道路的认识。该项目的研究目标是了解与多轴锻造相关的先进加工概念，以连续的方式，制造具有超细晶粒的轻质镁合金，其特点是非常高的强度与高延展性的结合。多轴锻造的工艺-结构-性能研究，通过改变每道次的应变，将通过阐明晶粒的取向依赖性和晶界特征分布之间的关系来解决镁合金中与织构相关的各向异性的关键问题。影响机械性能和变形机制。此外，通过发现从超细晶到粗晶结构的相对较宽的晶粒结构谱中晶粒取向分布与塑性机制之间的定量关系，将揭示高强度镁合金高延展性的机制基础。这将通过将纳米压痕实验与电子背散射衍射和变形晶粒的事后电子显微镜相结合，研究每道次应变对镁合金可成形性的依赖性来实现。此外，设想采用机器学习方法来计算晶粒取向分布和延展性之间的定量关系（作为每次道次应变的函数），以加速镁基合金的加工。该奖项反映了 NSF 的法定使命，并被认为是值得的通过使用基金会的智力优势和更广泛的影响审查标准进行评估来获得支持。

项目成果

On precipitation hardening behaviour in a triaxial forged Mg-2Zn-2Gd alloy and relationship to mechanical properties

三轴锻造 Mg-2Zn-2Gd 合金的沉淀硬化行为及其与力学性能的关系

• DOI: 10.1080/10667857.2023.2215038
• 发表时间: 2023-05-19
• 期刊: Materials Technology
• 影响因子: 3.1
• 作者: M. Weaver;A. Maldonado;J. Bañuelos;R. Misra
• 通讯作者: R. Misra

Strong and ductile texture-free ultrafine-grained magnesium alloy via three-axial forging

通过三轴锻造获得高强度、延展性无织构超细晶镁合金

• DOI: 10.1016/j.matlet.2022.133443
• 发表时间: 2023-01
• 期刊: Materials Letters
• 影响因子: 3
• 作者: Misra; R.D.K.
• 通讯作者: R.D.K.

Enabling manufacturing of multi-axial forging-induced ultrafine-grained strong and ductile magnesium alloys: a perspective of process-structure-property paradigm

实现多轴锻造诱导的超细晶粒强韧镁合金的制造：工艺-结构-性能范式的视角

• DOI: 10.1080/10667857.2023.2189769
• 发表时间: 2023-03-15
• 期刊: Materials Technology
• 影响因子: 3.1
• 作者: R. Misra