Interface regulation strategy of Al-CNTs composite induced by Al-Si eutectic reaction and its strengthening mechanism  

作　　者：Xin Zhang Xin Li Lei Liu Bo Li Xiaodong Hou Deng Pan Lina Gao Shufeng Li 

机构地区：[1]School of Materials Science and Engineering,Xi’an University of Technology,Xi’an 710048,China [2]Xi’an Key Laboratory of Advanced Powder Metallurgy Materials and New Technology,Xi’an University of Technology,Xi’an 710048,China [3]Centre of Excellence for Advanced Materials,Songshan Lake,Dongguan 523808,China

出　　处：《Journal of Materials Science & Technology》2023年第20期1-9,共9页材料科学技术（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.52201165 and 51871180);the Guangdong Basic and Applied Basic Research Foundation(No.2021A1515111163);the Guangdong Introducing Innovative and Enterpreneurial Teams(No.2016ZT06G025);the National Key R&D Program of China(No.2021YFB3701203);supported by the Doctoral Teacher Starting Fund of Xi’an University of Technology(Nos.101-451121007 and 101-451121008).

摘　　要：Carbon nanotubes(CNTs)reinforced aluminum matrix composites(AMCs)show broad application prospects in the fields of aerospace and transportation because of their lightweight,high specific strength and specific modulus.A new alloying strategy in this study is proposed to regulate its weak intrinsic interface and uncontrollable interfacial reaction.Our results show that Si element could hinder the dissolution and diffusion of carbon atoms in Al matrix,inhibiting Al-CNTs interface reaction.Grain refinement and dislocation increment induced by the reinforcements promote the contributions to the strength of AMCs.The wettability and interface bonding of Al-CNTs could be effectively improved by Al/Si/CNTs composite interface,the formed discontinuous strong interface is advantageous to coordinate the plastic deformation of AMCs.Si particles can also firmly fix CNTs through pinning effect during deformation,which leads to a better load transfer.Therefore,the tensile strength of Al-5Si-0.5CNTs composite can be enhanced up to 391 MPa while maintaining an acceptable plasticity of 7.5%.It brings the strengthening effect of CNTs into full play in AMCs and achieves the strengthening effect of 1+1>2 under the comprehensive effect of grain refinement strengthening,dislocation strengthening,dispersion strengthening of Si particles and load transfer to CNTs。

关 键 词：Aluminum matrix composites Interface regulation Microstructure Strengthening effect Mechanical properties 

分 类 号：TB3[一般工业技术—材料科学与工程]