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CAREER: High temperature strengthening via solute-enhanced stacking faults in structural alloys

职业：通过结构合金中溶质增强的堆垛层错进行高温强化

基本信息

批准号：
1848128
负责人：
Michael Titus
金额：
$ 54.69万
依托单位：
Purdue University
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2019
资助国家：
美国
起止时间：
2019-02-15 至 2025-01-31
项目状态：
未结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1848128&HistoricalAwards=false
关键词：
CAREER temperature strengthening via solute

项目摘要

PART 1: NON-TECHNICAL SUMMARYSuperalloys, which are comprised of nickel with complex mixtures of other metals, are an important class of metallic high temperature structural materials used in gas turbine engines for transportation, defense, and energy generation applications. The high temperature strength of these superalloys has recently been observed to be controlled by intricate atomistic-level processes that are not well understood due to the nature of the superalloy chemistry. The basic research enabled by this CAREER award will uncover the fundamental, atomistic-level processes governing high temperature strength in model metallic materials. Computational methods and theory will be developed to provide predictive capability of these atomistic processes, and advanced characterization methods will verify those predictions. This research will enable higher strength superalloys, which could increase turbine engine efficiencies and power while decreasing pollution emissions. The fundamental insights garnered from this program will be applicable to a wide range of ceramic, metallic, and semiconductor materials used across numerous industries and could enable new technologies. Outreach efforts as part of this program will include mentoring of local High School students and materials engineering-related learning module development and dissemination.PART 2: TECHNICAL SUMMARYDespite knowledge of solute segregation to stacking faults in crystalline materials, this phenomenon has yet to be utilized as a strengthening mechanism in most structural alloy materials. Recent works in the literature and by the PI have suggested that complex dislocation interactions and minute composition differences in Ni-based superalloys control the solute segregation behavior at stacking faults, and that this segregation behavior can be utilized to increase the high temperature creep strength in Ni-based superalloys. However, due to the complex compositions in advanced superalloys the driving forces governing solute segregation are not well understood. The basic research supported by this CAREER award seeks to uncover the fundamental thermodynamic driving forces for solute segregation to stacking faults in simple alloy compositions. The objective of this work is then to predict and quantify solute segregation at stacking faults during high temperature deformation in Ni-based superalloy compositions in order to utilize Suzuki segregation to further strengthen this important class of structural materials.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.

第一部分：由镍与其它金属的复杂混合物组成的超合金是一类重要的金属高温结构材料，用于运输、国防和能源产生应用的燃气涡轮机发动机。最近已经观察到这些超级合金的高温强度由复杂的原子级过程控制，由于超级合金化学的性质，这些过程还没有很好地理解。该CAREER奖项所支持的基础研究将揭示控制模型金属材料高温强度的基本原子级过程。计算方法和理论将被开发，以提供这些原子过程的预测能力，先进的表征方法将验证这些预测。这项研究将使更高强度的高温合金，这可以提高涡轮机发动机的效率和功率，同时减少污染排放。从该计划中获得的基本见解将适用于众多行业中使用的各种陶瓷，金属和半导体材料，并可以实现新技术。作为该计划的一部分，外展工作将包括指导当地高中学生和材料工程相关的学习模块的开发和传播。第2部分：技术总结尽管晶体材料中的溶质偏析堆垛层错的知识，这种现象还没有被利用作为大多数结构合金材料的强化机制。最近的文献和PI的研究表明，镍基高温合金中复杂的位错相互作用和微小的成分差异控制着堆垛层错处的溶质偏析行为，这种偏析行为可以用来提高镍基高温合金的高温蠕变强度。然而，由于先进高温合金的复杂成分，控制溶质偏析的驱动力还没有很好地理解。该CAREER奖支持的基础研究旨在揭示简单合金成分中溶质偏析到堆垛层错的基本热力学驱动力。这项工作的目标是预测和量化镍基高温合金成分在高温变形过程中堆垛层错处的溶质偏析，以利用铃木偏析进一步强化这类重要的结构材料。该奖项反映了NSF的法定使命，并被认为值得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来支持。

项目成果

期刊论文数量（5）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

pySSpredict: A python-based solid-solution strength prediction toolkit for complex concentrated alloys

DOI：
10.1016/j.commatsci.2022.111977
发表时间：
2023-03
期刊：
Computational Materials Science
影响因子：
3.3
作者：
Dongsheng Wen;M. Titus
通讯作者：
Dongsheng Wen;M. Titus

Supersolvus Hot Workability and Dynamic Recrystallization in Wrought Co–Al–W-Base Alloys.

变形钴铝钨基合金的超溶线热加工性和动态再结晶。

DOI：
10.1007/978-3-030-51834-9_84
发表时间：
2020
期刊：
Superalloys 2020
影响因子：
0
作者：
Wertz, K.;Weaver, D.;Wen, D.;Titus, M.S.;Shivpuri, R.;Niezgoda, S.R.;Mills, M.J.;Semiatin, S.L.
通讯作者：
Semiatin, S.L.

Planar Front Growth of Single Crystal Ni-Based Superalloy René N515

单晶镍基高温合金 René N515 的平面正面生长

DOI：
10.1007/s11837-020-04091-x
发表时间：
2020
期刊：
JOM
影响因子：
2.6
作者：
Matsunaga, Sae;Huang, Duo;Inman, Samuel B.;Mason, Jack C.;Konitzer, Doug;Johnson, David R.;Titus, Michael S.
通讯作者：
Titus, Michael S.

First-principles study of Suzuki segregation at stacking faults in disordered face-centered cubic Co-Ni alloys