In-situ Micro-CT analysis of deformation behavior in sandwich-structured meta-stable beta Ti−35Nb alloy  

三明治结构亚稳β-Ti−35Nb合金变形行为的原位Micro-CT分析

作　　者：Yu-jing LIU Zi-lin ZHANG Jin-cheng WANG Xiang WU Xiao-chun LIU Wei-ying HUANG Lai-chang ZHANG 刘玉敬;张自林;王金成;吴翔;刘小春;黄伟颖;张来昌(长沙理工大学材料科学与工程学院金属研究所,长沙410004;Centre for Advanced Materials and Manufacturing,School of Engineering,Edith Cowan University,Joondalup,Perth,WA 6027,Australia;长沙理工大学能源与动力工程学院,长沙410004)

机构地区：[1]Institute of Metals,School of Materials Science and Engineering,Changsha University of Science&Technology,Changsha 410004,China [2]Centre for Advanced Materials and Manufacturing,School of Engineering,Edith Cowan University,Joondalup,Perth,WA 6027,Australia [3]College of Energy and Power Engineering,Changsha University of Science&Technology,Changsha 410004,China

出　　处：《Transactions of Nonferrous Metals Society of China》2024年第8期2552-2562,共11页中国有色金属学报（英文版）

基　　金：the Hunan Young Scientific Innovative Talents Program,China(No.2020RC3040);Outstanding Youth Fund of Hunan Natural Science Foundation,China(Nos.2021JJ20011,2021JJ40600,2021JJ40590);the National Natural Science Foundation of China(Nos.52001030,52204371)..

摘　　要：Beta Ti−35Nb sandwich-structured composites with various reinforcing layers were designed and produced using additive manufacturing(AM)to achieve a balance between light weight and high strength.The impact of reinforcing layers on the compressive deformation behavior of porous composites was investigated through micro-computed tomography(Micro-CT)and finite element method(FEM)analyses.The results indicate that the addition of reinforcement layers to sandwich structures can significantly enhance the compressive yield strength and energy absorption capacity of porous metal structures;Micro-CT in-situ observation shows that the strain of the porous structure without the reinforcing layer is concentrated in the middle region,while the strain of the porous structure with the reinforcing layer is uniformly distributed;FEM analysis reveals that the reinforcing layers can alter stress distribution and reduce stress concentration,thereby promoting uniform deformation of the porous structure.The addition of reinforcing layer increases the compressive yield strength of sandwich-structured composite materials by 124%under the condition of limited reduction of porosity,and the yield strength increases from 4.6 to 10.3 MPa.利用增材制造(AM)技术制造具有不同增强层的β型Ti−35Nb合金三明治结构复合材料,以实现轻量化和高强度之间的平衡。通过原位微计算机断层扫描(Micro-CT)和有限元模拟法(FEM)研究增强层对多孔复合材料压缩变形行为的影响。结果表明,三明治结构加入增强层可显著提升多孔金属结构的压缩屈服强度和能量吸收能力;原位Micro-CT观察到未加入增强层的多孔结构应变集中在中间区域,而含有增强层多孔结构的应变则均匀分布;FEM分析揭示加入的增强层会改变应力分布并降低应力集中,从而促进多孔结构整体均匀变形。在有限降低孔隙率的条件下,增强层的加入使三明治结构复合材料的压缩屈服强度提升124%,屈服强度由4.6 MPa提升到10.3 MPa。

关 键 词：beta titanium alloy sandwich-structured composite in-situ micro-computed tomography finite element modeling compressive behavior 

分 类 号：TG146.23[一般工业技术—材料科学与工程]