Study of aluminium alloys addressing aspects of manufacturing, oxide formation, and recycling

铝合金的研究涉及制造、氧化物形成和回收等方面

• 批准号: 2282986
• 金额: --
• 依托单位: University of Oxford
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2019
• 资助国家: 英国
• 起止时间: 2019 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2282986
• 关键词: Study; aluminium; alloys; addressing; aspects

Aluminium (Al) and its alloys have been applied in various industry sectors, such as construction, energy, packaging, marine, aerospace and automotive. Al has a unique combination of attractive properties: (i) Al is lightweight with a specific density of 2.70 gcm-3, about a third that of steel (7.83 gcm-3), and the continuous demand for lower energy consumption has made it an ideal candidate to substitute for heavier alloys in components (ii) can be cast and machined; (iii) the strength of Al can be adapted to different applications by modifying the composition and hence the microstructure of its alloys. Some novel Al alloys and Al matrix composites have recently been receiving considerable attention due to their potential ability to cope with extreme conditions, such as elevated temperatures and high pressures. This can be achieved by alloying additions, tailoring the alloy compositions for desired precipitates and adding suitable reinforcements. The ultimate aim of the project is to bond together these very specialist, high strength, lightweight nano-quasicrystalline aluminium alloys which have very good high temperature strength, with a more conventional aluminium alloy. This is to enable the use of minimum quantities of the very expensive nano-quasicrystalline alloy, by placing this alloy only in the locations in a component which require these properties. An example would be the top surface of a piston for an automotive engine. In order to do this we need an improved understanding of the thermodynamics and kinetics of the oxidation of aluminium alloys as a function of composition and processing. Aluminium oxidises very readily and can take the form of a number of different oxides, amorphous and crystalline, in particle or film morphologies or in combinations. The presence of an oxide inhibits bonding but manipulation of the nature of the oxide can improve the bonding. The Department of Materials here at the University of Oxford has access to a number of sophisticated analysis techniques which can be used to investigate the rate of oxidation, the thickness of the oxides formed and the crystalline-types, compositions and morphologies of the oxides formed. We are perhaps the first laboratory in the world to have successfully dissolved away the aluminium from the oxide, so allowing detailed observation of the three-dimensional morphology of both sides of the oxide layer using electron microscopy techniques.The overall aim of the work is to provide a comprehensive understanding of the role of oxidation on the bonding of different Al alloys through advanced characterization techniques and simulating the results from thermodynamic and kinetic points of reference. This will lead to the prediction of stable oxides and the nature and integrity of the interfacial bond, i.e., oxide bilayer, which will facilitate the tailoring of oxides and the interfacial oxide bilayers in order to achieve the desired bond.This project falls within the EPSRC Manufacturing the future research area.

铝（Al）及其合金已应用于各种工业部门，例如建筑、能源、包装、船舶、航空航天和汽车。铝具有独特的吸引人的性能组合：（i）铝重量轻，比重为2.70 gcm-3，约为钢的三分之一（7.83 gcm-3），对低能耗的持续需求使其成为替代部件中较重合金的理想候选材料（ii）可铸造和机加工;（iii）铝的强度可以通过改变其合金的成分和微观结构来适应不同的应用。一些新型铝合金和铝基复合材料由于其科普高温高压等极端条件下的潜在能力而受到人们的广泛关注。这可以通过合金化添加物、针对所需沉淀物定制合金组成以及添加合适的增强物来实现。该项目的最终目标是将这些非常专业的高强度轻质纳米准晶铝合金与更传统的铝合金结合在一起，这些合金具有非常好的高温强度。这是为了能够使用最少量的非常昂贵的纳米准晶合金，通过将该合金仅放置在需要这些性能的部件中的位置。一个例子是汽车发动机活塞的顶面。为了做到这一点，我们需要更好地了解铝合金氧化的热力学和动力学，作为组成和加工的函数。铝非常容易氧化，并且可以采取许多不同的氧化物的形式，无定形和结晶，颗粒或膜形态或组合。氧化物的存在抑制键合，但操纵氧化物的性质可以改善键合。牛津大学材料系拥有许多复杂的分析技术，可用于研究氧化速率，形成的氧化物的厚度以及形成的氧化物的晶体类型，成分和形态。我们可能是世界上第一个成功地从氧化物中溶解掉铝的实验室，因此可以详细观察这三个-使用电子显微镜技术观察氧化层两侧的三维形态。这项工作的总体目标是通过先进的表征技术和模拟结果，全面了解氧化对不同铝合金结合的作用从热力学和动力学的参考点。这将导致预测稳定的氧化物和界面键的性质和完整性，即，氧化物双层，这将有助于剪裁氧化物和界面氧化物双层，以实现所需的键合。该项目属于EPSRC制造未来的研究领域福尔斯。