Development of Laser Powder Bed Fusion process for Complex Concentrated Alloys (a.k.a. High Entropy Alloys)

复杂浓缩合金（又名高熵合金）激光粉末床熔融工艺的开发

• 批准号: 2261412
• 金额: --
• 依托单位: University of Sheffield
• 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: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2261412
• 关键词: Development; Laser; Powder; Bed; Fusion

Complex Concentrated Alloys (also known as High Entropy Alloys) have caused much excitement in the metallurgy community in the last decade and a half. These materials, where a relatively large number of elements (hence complex) are combined at similar fractions (hence concentrated) have been indicated to possess the potential for many desirable properties, from high strength to high stability at high temperature. It is therefore unsurprising that they have attracted interest for advanced applications, such as in aerospace. However, some of these alloys can be difficult to process by conventional means, and the complex shapes required for high-performance components means that Additive Manufacturing, where parts are built up progressively from the material in powdered form, may be the most effective solution. Much remains unknown about using such materials in such processes however.The work will use Additive Manufacturing techniques, such as Selective Laser Melting, to process High Entropy Alloys. The aim will be to ensure suitable processing, yielding an appropriate microstructure and low defect content. Once reliable material has been processed, it will be characterised to determine its performance in additive manufactured form relative to simple casting. From this point, prototype versions of specific components could be made and tested, or the composition of the alloy altered to try and improve its Additive Manufacturability, or to generate specific material behaviours or properties which would be desirable.

在过去的15年里，复杂的浓缩合金(也称为高熵合金)在冶金学界引起了极大的兴趣。这些材料中相对大量的元素(因此是复杂的)以相似的馏分(因此是浓缩的)结合在一起，已经被表明具有许多理想的性能的潜力，从高强度到高温下的高稳定性。因此，它们吸引了人们对先进应用的兴趣也就不足为奇了，例如在航空航天方面。然而，这些合金中的一些很难通过传统方法进行加工，而高性能部件所需的复杂形状意味着添加剂制造可能是最有效的解决方案，这种制造方法是从粉末形式的材料逐步组装零件。然而，在这种工艺中使用这种材料仍有许多未知之处。这项工作将使用添加剂制造技术，如选择性激光熔化，来加工高熵合金。其目的将是确保适当的加工，产生适当的显微组织和低缺陷含量。一旦可靠的材料被加工，它的特征将是确定其相对于简单铸造而言以添加剂制造形式的性能。从这一点出发，可以制造和测试特定组件的原型版本，或者改变合金的成分，以尝试并改进其添加剂可制造性，或者产生所需的特定材料行为或性能。