Design,preparation,microstructure and mechanical property of the lightweight radiation-shielding Mg-Ta-Al composites basing differential temperature hot rolling  

作　　者：Wenbo Luo Songya Feng Xiuzhu Han Li Zhou Qinke Kong Zhiyong Xue Jianzhao Wang Mei Zhan Xianhua Chen Fusheng Pan 

机构地区：[1]Institute for Advanced Materials,North China Electric Power University,Beijing 102206,China [2]Beijing Institute of Spacecraft System Engineering,Beijing 100094,China [3]Sinosteel Equipment&Engineering Co,Ltd.,Beijing,100080,China [4]State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization,Inner Mongolia 014030,China [5]School of Materials Science,Northwestern Polytechnical University,Xi’an 710072,China [6]College of Materials Science and Engineering,Chongqing University,Chongqing 400045,China

出　　处：《Journal of Magnesium and Alloys》2024年第6期2433-2446,共14页镁合金学报（英文）

基　　金：supported by the National Natural Science Foundation of China(grant no.52192603,52275308).

摘　　要：A novel lightweight,radiation-shielding Mg-Ta-Al layered metal-matrix composite(LMC)was successful designed by doping the extremely refractory metal(Ta)into Mg sheets.These Mg-based LMCs sheets shows excellent radiation-dose shield effect,about 145 krad·a^(−1),which is about 17 times of traditional Mg alloy,while its surface density is only about 0.9 g·cm^(−2),reducing by 60%than that of pure Ta.The quantitate relationship between radiation-dose and the materials’thickness was also confirmed to the logistic function when the surface density is in the range of 0.6-1.5 g·cm^(−2).Meantime,the rolling parameters,interface microstructure and mechanical properties in both as-rolled and annealing treated samples were evaluated.The sheets possess a special dissimilar atoms diffusion transitional zone containing an obvious inter-diffusion Mg-Al interface and the unique micro-corrugated Ta-Al interface,as well as a thin Al film with a thickness of about 10μm.The special zone could reduce the stress concentration and enhance the strength of Mg-Ta-Al LMCs.The interface bonding strength reaches up to 54-76 MPa.The ultimate tensile strength(UTS)and yield strength(TYS)of the Mg-Ta-Al sheet were high to 413 MPa and 263 MPa,respectively,along with an elongation of 5.8%.The molecular dynamics(MD)analysis results show that the two interfaces exhibit different formation mechanism,the Mg-Al interface primarily depended on Mg/Al atoms diffusion basing point defects movement,while the Ta-Al interface with a micro-interlock pining shape formed by close-packed planes slipping during high temperature strain-induced deformation process.

关 键 词：Dissimilar metals composites Mg based alloys Radiation shielding Hot rolling LIGHTWEIGHT 

分 类 号：TB331[一般工业技术—材料科学与工程]