Reducing Emissions by Exploiting Field-Induced Martensitic Transformations

通过利用场诱导马氏体相变减少排放

• 批准号: EP/H004882/1
• 负责人: David Dye
• 金额: $ 146.78万
• 依托单位: Imperial College London
• 依托单位国家: 英国
• 项目类别: Fellowship
• 财政年份: 2010
• 资助国家: 英国
• 起止时间: 2010 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FH004882%2F1
• 关键词: Reducing; Emissions; Exploiting; Field; Induced

The aim of the the fellowship will be to develop the analysis tools to design and use materials that exploit stress- and electromagnetic field-affected phase transformations. This area extends from bainite and martensite in steels to the variant selection problem during the beta->alpha transformation in titanium and zirconium alloys, from omega superelasticity in the beta-Ti alloy GUM metal to NiTi shape memory alloys (SMAs) and ferromagnetic SMAs. In the component context, conventional SMAs rely on a temperature change to provide actuation, which is achieved either passively in response to the environment or by heating / cooling using bleed air, resistance heating or heating filaments. Ferromagnetic SMAs use an electromagnetic field, which allows much faster switching, for example in a pump or to improve flow control. While the crystallography of these transformations is well understood, models are not generally available for the micromechanics that can be incorporated into Finite Element (FE) descriptions of component behaviour used by designers. In addition, whilst these systems are clearly tractable to atomistic approaches, atomistic modeling is still too immature to reliably design new alloys without experimental support; however approaches such as density functional theory (DFT) can enable insight into alloy design approaches to be developed. A subsidiary aim will be to start to bridge the gap to the DFT community. In conventional alloys the problem is often complicated by a diffusional component to the transformation, or nucleation may be the limiting step. However, we have recently shown clearly that applied stress can bias variant selection, leading to the production of mono-variant transformed beta grains in Ti-6246, with consequent effects on properties. The ability to model variant selection in diffusionless transformations, such as in martensite in steels, omega in Ti and Zr, and in (f)SMAs will be a prerequisite to modeling the more complicated problem in Ti-64 and Ti-6246. Industrially, the major goal of the fellowship will be to build a capability to model such transformations and to design alloys exploiting them for use in aerospace, automotive and power applications, with QinetiQ, Rolls-Royce, Timet, Corus and DSTL.

奖学金的目的是开发分析工具，以设计和使用利用应力和电磁场影响的相变的材料。该区域从钢中的贝氏和马氏体延伸到钛和锆合金中的β-> alpha转换期间的变体选择问题，从β-Ti合金胶金属的欧米茄超弹性到NITI的omega超弹性到NITI形状的存储合金（SMAS）和铁磁smas。在组件环境中，常规的SMA依赖温度变化来提供致动，这是针对环境而被动地实现的，或者是使用流失的空气，阻力加热或加热丝进行加热 /冷却。铁磁SMA使用电磁场，该场允许更快的开关，例如在泵中或改善流量控制。虽然这些转换的晶体学已充分了解，但模型通常不能用于可以将设计师使用的组件行为描述中纳入有限元（Fe）描述中的微力学。此外，尽管这些系统显然可以针对原子方法处理，但原子建模仍然太不成熟，无法在没有实验支持的情况下可靠地设计新合金。但是，诸如密度功能理论（DFT）之类的方法可以洞悉要开发的合金设计方法。子公司的目标是开始弥合DFT社区的差距。在常规合金中，这个问题通常会因转化的扩散成分而变得复杂，或者成核可能是限制步骤。但是，我们最近清楚地表明，施加的应力可以偏向变异选择，从而导致TI-6246中单变体转化的β晶粒的产生，从而对性质产生影响。在无扩散转换中建模变体选择的能力，例如在钢中的马氏体中，Ti和Zr中的Omega以及（F）SMA中的欧米茄（Omega）的能力将是建模TI-64和TI-6246中更复杂问题的先决条件。从工业上讲，奖学金的主要目标是建立建模这种转换的能力，并设计利用它们用于航空航天，汽车和电力应用的合金，并与Qinetiq，Rolls-Royce，Timet，Corus，Corus和Dstl一起使用。

项目成果

Using coupled micropillar compression and micro-Laue diffraction to investigate deformation mechanisms in a complex metallic alloy Al13Co4

利用耦合微柱压缩和微劳厄衍射研究复杂金属合金 Al13Co4 的变形机制

• DOI: 10.1063/1.4944486
• 发表时间: 2016
• 期刊: Applied Physics Letters
• 影响因子: 4
• 作者: Bhowmik A

Lattice instability during the martensitic transformation in the high temperature shape memory alloy Zr(Cu0.5Co0.25Ni0.25)

• DOI: 10.1016/j.jallcom.2014.08.141
• 发表时间: 2015-01
• 期刊: Journal of Alloys and Compounds
• 影响因子: 6.2
• 作者: M. Azeem;D. Dye

In situ evaluation of the transformation behaviour of NiTi-based high temperature shape memory alloys

• DOI: 10.1016/j.intermet.2013.11.009
• 发表时间: 2014-03-01
• 期刊: INTERMETALLICS
• 影响因子: 4.4
• 作者: Azeem, M. A.;Dye, D.
• 通讯作者: Dye, D.

Functional stability of a ferromagnetic polycrystalline Ni2MnGa high temperature shape memory alloy

• DOI: 10.1016/j.scriptamat.2016.12.012
• 发表时间: 2017-03-15
• 期刊: SCRIPTA MATERIALIA
• 影响因子: 6
• 作者: Azeem, M. A.;Jones, N. G.;Dye, D.
• 通讯作者: Dye, D.

Precipitation processes in the Beta-Titanium alloy Ti-5Al-5Mo-5V-3Cr

• DOI: 10.1016/j.jallcom.2015.05.251
• 发表时间: 2015-10-15
• 期刊: JOURNAL OF ALLOYS AND COMPOUNDS
• 影响因子: 6.2
• 作者: Coakley, James;Vorontsov, Vassili A.;Dye, David
• 通讯作者: Dye, David