Rapid Solidification of High Entropy Alloys

高熵合金的快速凝固

• 批准号: 2436180
• 金额: --
• 依托单位: University of Leeds
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2020
• 资助国家: 英国
• 起止时间: 2020 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2436180
• 关键词: Rapid; Solidification; Entropy; Alloys

High entropy alloys (HEA's) are an exciting new class of metallic materials in which typically 5 or more constituent elements are combined in approximately equal quantities. They represent a paradigm shift from conventional alloy metallurgy, in which small additions are made to a single, dominant, base element, usually with the intention of improving one or more of the alloys properties. Remarkably, despite their chemical complexity, such HEA's are structurally very simple, generally containing just one, or at most two, simple crystalline phases. This is again in contrast to conventional alloys which may contain dozens of both desired and spurious intermetallic phases, often with complex crystal structures. High entropy alloys possess a number of remarkable mechanical properties, including the retention of high yield strengths at elevated temperature. Consequently, multiple applications have been proposed. In this research we will look at a range of HEA's, studying the phase composition, microstructure and mechanical properties as a function of both composition and cooling rate, with drop-tube experiments giving access to cooling rates in the range 500-80,000 K s-1. A range of analytical technique will be used to characterise the resulting materials, including SEM, TEM, X-ray diffraction and mechanical testing.

高熵合金（HEA）是一种令人兴奋的新型金属材料，其中通常5种或更多种组成元素以近似相等的量组合。它们代表了传统合金冶金学的范式转变，在传统合金冶金学中，对单一的主导基础元素进行少量添加，通常旨在改善一种或多种合金性能。值得注意的是，尽管化学结构复杂，但此类HEA的结构非常简单，通常仅含有一个或最多两个简单的晶相。这再次与常规合金形成对比，常规合金可能含有数十种期望的和假的金属间相，通常具有复杂的晶体结构。高熵合金具有许多显著的机械性能，包括在高温下保持高屈服强度。因此，提出了多种应用。在这项研究中，我们将研究一系列HEA，研究相组成，微观结构和机械性能作为组成和冷却速率的函数，落管实验提供了500- 80，000 K s-1范围内的冷却速率。一系列的分析技术将被用于测试所得到的材料，包括SEM、TEM、X射线衍射和机械测试。