Nickel-based superalloy architectures with surface mechanical attrition treatment: Compressive properties and collapse behaviour  

作　　者：Lizi Cheng Xiaofeng Zhang Jiacheng Xu Temitope Olumide Olugbade Gan Li Dongdong Dong Fucong Lyu Haojie Kong Mengke Huo Jian Lu 

机构地区：[1]CityU-Shenzhen Futian Research Institute,Shenzhen,China [2]Department of Mechanical Engineering,City University of Hong Kong,Hong Kong,China [3]Department of Engineering,University of Cambridge,Cambridge,UK [4]National Engineering Laboratory for Modern Materials Surface Engineering Technology&The Key Lab of Guangdong for Modern Surface Engineering Technology,Institute of New Materials,Guangdong Academy of Science,510650,Guangzhou,China [5]Mechanical and Electronic Engineering Department,School of Science and Engineering,University of Dundee,Dundee,UK [6]Centre for Advanced Structural Materials,City University of Hong Kong Shenzhen Research Institute,Greater Bay Joint Division,Shenyang National Laboratory for Materials Science,Shenzhen,China

出　　处：《Nano Materials Science》2024年第5期587-595,共9页纳米材料科学（英文版）

基　　金：support provided by Shenzhen-Hong Kong Science and Technology Innovation Cooperation Zone Shenzhen Park Project:HZQB-KCZYB-2020030;the Hong Kong General Research Fund(GRF)Scheme(Ref:CityU 11216219);the Research Grants Council of Hong Kong(Project No:AoE/M-402/20);Shenzhen Science and Technology Program:JCYJ20220818101204010;the Hong Kong Innovation and Technology Commission via the Hong Kong Branch of National Precious Metals Material Engineering Research Center.

摘　　要：Surface modifications can introduce natural gradients or structural hierarchy into human-made microlattices,making them simultaneously strong and tough.Herein,we describe our investigations of the mechanical properties and the underlying mechanisms of additively manufactured nickel–chromium superalloy(IN625)microlattices after surface mechanical attrition treatment(SMAT).Our results demonstrated that SMAT increased the yielding strength of these microlattices by more than 64.71%and also triggered a transition in their mechanical behaviour.Two primary failure modes were distinguished:weak global deformation,and layer-by-layer collapse,with the latter enhanced by SMAT.The significantly improved mechanical performance was attributable to the ultrafine and hard graded-nanograin layer induced by SMAT,which effectively leveraged the material and structural effects.These results were further validated by finite element analysis.This work provides insight into collapse behaviour and should facilitate the design of ultralight yet buckling-resistant cellular materials.

关 键 词：Architected materials Selective laser melting Surface mechanical attrition treatment Structural analysis Ductile alloy 

分 类 号：TG14[一般工业技术—材料科学与工程]