Effects of dealloying and heat treatment parameters on microstructures of nanoporous Pd  

作　　者：Y.Z.Chen X.Y.Ma W.X.Zhang H.Dong G.B.Shan Y.B.Cong C.Li C.L.Yang F.Liu 

机构地区：[1]State Key Lab.of Solidification Processing,Northwestern Polytechnical University,710072 Xi’an,China

出　　处：《Journal of Materials Science & Technology》2020年第13期123-129,共7页材料科学技术（英文版）

基　　金：supported financially by the National Natural Science Foundation of China(Nos.51771153,51371147,51790481 and 51431008);the Innovation Foundation for Doctor Dissertation of Northwestern Polytechnical University(No.CX201825)。

摘　　要：Microstructures of nanoporous Pd are essentially important for its physical and chemical properties.In this work,we show that the microstructures of nanoporous Pd can be tuned by adjusting compositions of the precursor alloys,and dealloying and heat treatment parameters.Both the ligament and pore sizes decrease with increasing the electrochemical potential upon dealloying and the concentration of noble component in the precursor alloys.Heat treatment causes coarsening of the nanoporous structure.Above a critical temperature,the nanoporous structures are subjected to significant coarsening.Below the critical temperature,surface diffusion is believed to dominate the coarsening process.Above the critical temperature,the nanoporous structure coarsens remarkably at a rather high rate,which is ascribed to a multiple-mechanism controlled process.

关 键 词：Nanoporous metals Microstructure DEALLOYING KINETICS COARSENING 

分 类 号：TB383.1[一般工业技术—材料科学与工程] TG156[金属学及工艺—热处理] TG146.36[金属学及工艺—金属学]