Understanding, Developing and Exploiting Cobalt Superalloys for Discs

了解、开发和利用用于圆盘的钴高温合金

• 批准号: EP/L001748/1
• 负责人: David Dye
• 金额: $ 32.21万
• 依托单位: Imperial College London
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2013
• 资助国家: 英国
• 起止时间: 2013 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FL001748%2F1
• 关键词: Understanding; Developing; Exploiting; Cobalt; Superalloys

In 2005, the discovery of a new intermetallic was announced in Science, Co3(Al,W), together with evidence Co-Co3(Al,W) alloys might have a higher temperature capability than in the Ni-base superalloys used in jet engines. It was claimed that this would allow a new generation of gas turbine alloys to be developed beyond Ni-base superalloys. However, these alloys and those developed since have densities that are too high and oxidation resistance that is too poor for engineering application. Over the past two years, as part of the Rolls Royce - EPSRC Strategic Partnership, two PhD students at Imperial College have demonstrated that a lower density, oxidation resistant Co-base superalloy can be developed, which still has a superior temperature capability.The aim of the current work is to develop the underpinning science underlying the effect of alloying on the creep behaviour of these alloys, which is principally a function of the way in which deformation-related defects called dislocations move through the structure and in particular the way they interact with the intermetallic precipitate. Our recent work has demonstrated that this interface is not sharp and instead has a width that varies with alloying from 0.4 to over 2nm, a factor of over 5X. It is expected that this will increase the rate at which these intermetallic precipitates grow in size - from 20nm to over 200nm - in service, which in turn is a major driver for strength and creep resistance.

2005 年，《科学》杂志宣布发现了一种新金属间化合物 Co3(Al,W)，并证明 Co-Co3(Al,W) 合金可能具有比喷气发动机中使用的镍基高温合金更高的温度性能。据称，这将允许开发除镍基高温合金之外的新一代燃气轮机合金。然而，这些合金以及此后开发的合金密度过高，抗氧化性太差，不适合工程应用。在过去的两年里，作为劳斯莱斯 - EPSRC 战略合作伙伴关系的一部分，帝国理工学院的两名博士生证明了可以开发出一种密度较低、抗氧化的钴基高温合金，该合金仍然具有优异的温度性能。当前工作的目的是开发合金化对这些合金蠕变行为影响的基础科学，这主要是变形相关的蠕变行为方式的函数。 称为位错的缺陷在结构中移动，特别是它们与金属间沉淀物相互作用的方式。我们最近的工作表明，该界面并不尖锐，而是具有随合金化而变化的宽度，从 0.4 到 2 nm 以上，变化超过 5 倍。预计这将提高使用中这些金属间沉淀物尺寸的增长速度（从 20 纳米到超过 200 纳米），这反过来又是强度和抗蠕变性的主要驱动力。

项目成果

Femtosecond quantification of void evolution during rapid material failure.

快速量化在快速材料失败期间空隙演化的定量。

• DOI: 10.1126/sciadv.abb4434
• 发表时间: 2020-12
• 期刊: Science advances
• 影响因子: 13.6
• 作者: Coakley J;Higginbotham A;McGonegle D;Ilavsky J;Swinburne TD;Wark JS;Rahman KM;Vorontsov VA;Dye D;Lane TJ;Boutet S;Koglin J;Robinson J;Milathianaki D
• 通讯作者: Milathianaki D

Characterisation of short fatigue cracks in titanium alloy IMI 834 using X-ray microtomography

• DOI: 10.1016/j.actamat.2015.07.069
• 发表时间: 2015-10
• 期刊: Acta Materialia
• 影响因子: 9.4
• 作者: T. Chapman;K. Kareh;M. Knop;T. Connolley;P. Lee;M. Azeem;D. Rugg;T. C. Lindley;D. Dye

A New Polycrystalline Co-Ni Superalloy

• DOI: 10.1007/s11837-014-1175-9
• 发表时间: 2014-10
• 期刊: JOM
• 影响因子: 2.6
• 作者: M. Knop;P. Mulvey;F. Ismail;A. Radecka;K. Rahman;T. C. Lindley;B. Shollock;M. Hardy;M. Moody;Tomas L Martin;P. Bagot;D. Dye

Insights into microstructural interfaces in aerospace alloys characterised by atom probe tomography

通过原子探针断层扫描深入了解航空航天合金的微观结构界面

• DOI: 10.1179/1743284715y.0000000132
• 发表时间: 2016
• 期刊: Materials Science and Technology
• 影响因子: 1.8
• 作者: Martin T

Isothermal omega kinetics in beta-titanium alloys

• DOI: 10.1080/09500839.2017.1282633
• 发表时间: 2017-01
• 期刊: Philosophical Magazine Letters
• 影响因子: 1.2
• 作者: J. Coakley;B. Seong;D. Dye;M. Ohnuma