会议题目：Ultrahigh-strength and ductile superlattice alloys with nanoscale disordered interfaces

会议时间：2020/12/14 15:00-16:30

会议地点：腾讯会议ID：884 568 110 点击链接入会，或添加至会议列表：https://meeting.tencent.com/s/yWe73LSzEXqT

报告人：杨涛副研究员

邀请人： 王海丰

简介：Alloys that have high strengths at high temperatures are crucial for a variety of important industries including aerospace.Alloys with ordered superlattice structures are attractive for this purpose but generally suffer from poor ductility and rapid grain coarsening. We discovered that nanoscale disordered interfaces can effectively overcome these problems. Interfacial disordering is driven by multielement co-segregation that creates a distinctive nanolayer between adjacent micrometer-scale superlattice grains. This nanolayer acts as a sustainable ductilizing source, which prevents brittle intergranular fractures by enhancing dislocation mobilities. Our superlattice materials have ultrahigh strengths of 1.6 gigapascals with tensile ductilities of 25% at ambient temperature. Simultaneously, we achieved negligible grain coarsening with exceptional softening resistance at elevated temperatures. Designing similar nanolayers may open a pathway for further optimization of alloy properties.

报告人简介：杨涛博士于2014年毕业于厦门大学我院，获得材料学硕士学位；2018年毕业于香港城市大学机械工程学院（C.T. Liu院士课题组），取得工程学博士学位。香港特区政府HKPFS计划成员，香港高等研究院(HKIAS)杰出博士后，现任香港城市大学材料科学与工程系助理教授，香港城市大学深圳研究院副研究员。长期从事先进金属材料的合金设计与组织结构调控的研究，主要通过三维原子探针层析（3D-APT）和透射电镜（HR-TEM）等技术手段研究合金材料的成分设计、材料热力学与动力学行为、固态相变行为与变形机制等。目前的研究课题主要集中在多主元金属间化合物，高熵合金，钛合金、铝镁合金、晶界工程、3D打印等相关领域。课题组内拥有齐全的金属材料加工与显微表征的仪器设备，如3D-APT，HR-TEM，EBSD，Arc Melting，In-situ TEM等，并与众多知名大学建立了良好的合作关系。近年来先后取得了多项重要的研究成果，并成功发表在Science（2篇），Advanced Materials, Nature Communications, Acta Materialia, Scientific Reports, Materials Research Letters, Intermetallics, Scripta Materialia等国际知名期刊，并长期担任Acta Materialia, Scripta Materialia, Materials & Design, Materials Letters等多个杂志的审稿人。