Influence of Fe-rich phases and precipitates on the mechanical behaviour of Al-Cu-Mn-Fe-Sc-Zr alloys studied by synchrotron X-ray and neutron  

作　　者：Yuliang Zhao Dongfu Song Shengchuan Wu Shunfu Xie Haoliang Wang Mengmeng Wang Weiwen Zhang Zhenzhong Sun Yubin Ke Shanfeng Wang Wanxia Huang Ricardo Fernández 

机构地区：[1]Neutron Scattering Technical Engineering Research Centre,School of Mechanical Engineering,Dongguan University of Technology,Dongguan 523808,China [2]Centro Nacional de Investigaciones Metalúrgicas(CENIM),C.S.I.C.,Avda.de Gregorio del Amo 8,Madrid 28040,Spain [3]National Engineering Research Centre of Near-Net-Shape Forming for Metallic Materials,South China University of Technology,Guangzhou 510641,China [4]Institute of New Materials,Guangdong Academy of Science,Guangzhou 510650,China [5]State Key Laboratory of Traction Power,Southwest Jiaotong University,Chengdu 610031,China [6]Spallation Neutron Source Science Center,Dongguan 523803,China [7]School of Materials Science and Engineering,Anhui Polytechnic University,Wuhu 241000,China [8]Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100039,China

出　　处：《Journal of Materials Science & Technology》2023年第27期226-241,共16页材料科学技术（英文版）

基　　金：financially supported by the Natural Science Foundation of China(Nos.52104373 and 51901042);the Ba-sic and Applied Basic Foundation of Guangdong Province,China(Nos.2020B1515120065 and 2021B1515140028);the Guangdong Province Office of Education,China(No.2018KQNCX256).

摘　　要：A multiscale methodology using scanning and transmission electron microscope,synchrotron X-ray nano-tomography and micro-tomography,small angle neutron scattering,and in situ synchrotron X-ray diffrac-tion has been used,to reveal the effect of Fe-rich phases and precipitates on the mechanical behaviour of an Al-Cu-Mn-Fe-Sc-Zr alloy.Theα-Al grains size is reduced from 185.1μm(0 MPa)and 114.3μm(75 MPa)by applied pressure.Moreover,it has been demonstrated that suitable heat treatments modify the 3D morphology of Fe-rich phases from interconnected to a disaggregated structure that improves the mechanical properties of the alloy.The size and morphology evolution of fine precipitates under differ-ent ageing temperature and time are revealed.At ageing temperature of 160℃,the precipitates change from GP zones toθ’(around 75 nm in length)with ageing time increasing from 1 h to 24 h;the Vick-ers hardness increases from 72.0 HV to 110.7HV.The high ductility of the Sc,Zr modified Al-Cu alloy is related to the complex shape and the loss of interconnectivity of the Fe-rich particles due to the heat treatment.The evolution of the crystal lattice strains inα-Al,andβ-Fe calculated during tensile test us-ing in-situ synchrotron X-ray diffraction corroborates the influence of the microstructure in the ductility of the modified alloy.

关 键 词：Al alloy Ageing process Mechanical properties In situ synchrotron X-ray Sc/Zr microalloying Fe-rich phase 

分 类 号：TG146.21[一般工业技术—材料科学与工程]