学 术 报 告

报告题目：Additively manufactured hierarchical high-entropy alloy

报 告 人：安祥海（澳大利亚悉尼大学）

报告时间：2023年12月25日周一上午9：30

报告地点：立功楼3-2

报告内容：Multiple-principal element (MPE) alloys, also well known as high-entropy alloys (HEA), are a novel class of metallic materials with three or more principal elements having approximately equiatomic concentrations, which open up a new avenue for the design of materials with optimized properties. The severe lattice distortion and sluggish diffusion that are induced by the mixture of multiple elements endow MEA alloys with exceptional structure stability and outstanding mechanical properties. However, the current preparations of MEA alloys rely mainly on the conventional melting or casting methods, imposing enormous limitations to produce samples with complex geometry in terms of cost and efficiency for practical applications. The additive manufacturing (AM) techniques have been recognized as a transformative technology across multiple industries. Based on their advantages of net-shape manufacturing capability and design freedom, it is feasible to harvest parts with complex geometries directly from computer-aided design (CAD) models. In this study, we applied selective laser melting (SLM) technique, which is one of the most popular AM techniques, to prepare near-fully dense MEA alloys. The as-built samples exhibit a hierarchical nanostructure, including melt pools, columnar grains, dislocations, and sub-micron cellular structures. An outstanding combination of high strength and excellent ductility compared to those fabricated by conventional methods was achieved in the as-built samples. The detailed deformation behaviour, strengthening mechanism, thermal stability, and tunable hydrogen resistance will be discussed in this talk.

报告人简介：安祥海博士，澳大利亚DECRA学者，德国洪堡学者，现任悉尼大学航天机械和机电工程学院高级讲师/Robinson研究员，并任学院副院长，主要从事先进结构材料的微观结构表征及力学行为研究。在Science，Science Advances，Nature Communications，Progress in Materials Science，Acta Materialia， International Journal of Plasticity等著名刊物累计发表SCI论文及评论员80余篇，引用次数超过5000次。担任Science等期刊审稿人，ActaMaterialia和Scripta Materialia杰出审稿人。

热烈欢迎机械工程、材料科学及相关学科的老师和研究生参加！