Cryogenic Wear of Novel High-Entropy Alloys

新型高熵合金的低温磨损

• 批准号: 1758924
• 负责人: Ian Baker
• 金额: $ 44.09万
• 依托单位: Dartmouth College
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-09-01 至 2023-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1758924&HistoricalAwards=false
• 关键词: Cryogenic; Wear; Novel; Entropy; Alloys

Friction and wear are a leading cause of energy loss, inefficiency, and failure in structural alloys, and a scientific understanding of the mechanisms of wear is critical to the design of high performance materials for energy, manufacturing, and infrastructure applications. A new class of alloys known as High Entropy Alloys has recently been found to possess both high strength and the potential for very high wear resistance. This award supports research to determine the fundamental mechanisms of this high wear resistance in two novel High Entropy Alloy compositions. The new knowledge to be gained from this work has the potential to enable the design of high performance materials able to withstand large forces in extreme service environments, including friction and wear at cryogenic temperatures. Students engaged in the research activities will gain valuable educational experience at the undergraduate and graduate level.The aim of this research project is to examine the hypotheses that the high entropy alloys CoCrFeMnNi and carbon-doped Fe40.4Ni11.3Mn34.8Al7.5Cr6, because of their superior yield strengths compared to stainless steel, will show better wear resistance than stainless steel at 77 K, that that the contacting surfaces of the two alloys will be resistant to phase transformations during dry sliding wear at either room temperature or 77 K, and that the worn surfaces will not exhibit ferromagnetism, whereas austenitic stainless steel AISI 316 will exhibit both of these problems. Dry sliding pin-on-disk wear tests will be performed at both 77 K and 293 K at different sliding velocities and in different environments on these two alloys, and compared to the behavior of 316 stainless steel. The relationship between the microstructure, deformation processes (including material transfer), phase transformations, friction and wear behavior will be determined. Microstructural characterization of the pre- and post-wear specimens will include transmission electron microscopy, X-ray dispersive spectroscopy; computed-assisted profilometry; X-ray diffraction; nanoindentation; cross-sectional scanning electron microscopy, atom probe tomography; and X-ray photoelectron spectroscopy.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.

摩擦和磨损是能源损失，效率低下和结构合金失败的主要原因，对磨损机制的科学理解对于设计高性能材料的高性能材料至关重要。最近发现，一种称为高熵合金的新型合金具有高强度，并且具有非常高的耐磨性。该奖项支持研究，以确定两种新型高熵合金组成中这种高磨损耐药性的基本机制。从这项工作中获得的新知识有可能使高性能材料的设计能够在极端的服务环境中承受大力量，包括在低温温度下摩擦和磨损。从事研究活动的学生将在本科和研究生水平上获得有价值的教育经验。该研究项目的目的是检查假设的假设，即高熵合金cocrfemnni和碳掺杂的FE40.40.40.4NI11.34.8Al7.5Cr6与以下7.5cr6相比，它与7.5cr相比，在7级上的耐磨钢，因为它的连接均匀的钢制均可在7级上保持不适的钢制，因此他的耐磨性均匀的钢制均可出现。在室温或77 K下干滑动期间，两种合金的表面对相变的相变，并且磨损的表面不会表现出铁磁性，而奥斯丁构的不锈钢AISI 316则将表现出这两个问题。在不同的滑动速度和这两种合金上的不同环境中，将在77 K和293 K上进行干燥的滑动钉磨损测试，并与316不锈钢的行为相比。将确定微观结构，变形过程（包括材料转换），相变，摩擦和磨损行为之间的关系。 前服装和后样品的显微结构表征包括透射电子显微镜，X射线色散光谱；计算的辅助验证仪； X射线衍射；纳米凹痕；横截面扫描电子显微镜，原子探针断层扫描；该奖项反映了NSF的法定任务，并被认为是通过基金会的知识分子优点和更广泛的影响审查标准通过评估来支持的。

项目成果

A comparison of the dry sliding wear behavior of NiCoCr medium entropy alloy with 316 stainless steel

• DOI: 10.1016/j.matchar.2020.110132
• 发表时间: 2020-02
• 期刊: Materials Characterization
• 影响因子: 4.7
• 作者: Xiao-bin Guo;I. Baker;F. Kennedy;M. Song

Development of a new cryogenic tribotester and its application to the study of cryogenic wear of AISI 316 stainless steel

新型低温摩擦测试仪的研制及其在AISI 316不锈钢低温磨损研究中的应用

• DOI: 10.1016/j.wear.2022.204309
• 发表时间: 2022
• 期刊: Wear
• 影响因子: 5
• 作者: Kennedy, Francis E.;Ye, Youxiong;Baker, Ian;White, Raina R.;Barry, Robert L.;Tang, Aubrey Y.;Song, Min
• 通讯作者: Song, Min

A comparison of the dry sliding wear of single-phase f.c.c. carbon-doped Fe40.4Ni11.3Mn34.8Al7.5Cr6 and CoCrFeMnNi high entropy alloys with 316 stainless steel

• DOI: 10.1016/j.matchar.2020.110693
• 发表时间: 2020-12
• 期刊: Materials Characterization
• 影响因子: 4.7
• 作者: Xiao-bin Guo;Xiao-bin Guo;I. Baker;F. Kennedy;S. Ringer;Hansheng Chen;Weidong Zhang;Yong Liu-