晶粒尺寸与膜厚度对介观尺度铝箔蠕变变形的影响.pdf

Vol No ACTA METALLURGICA SINICA Mar pp beOQiSTaZOSfMjKKuRxt sDDsiLaLbelYWLs
ZFiLLaLBZF y w vA OHvBXQ m XvxgFBDMSMXQ t JDj d Be vqZs td KyNFvkgvOo td vBTEM qTPDBfvgb td oevqDwBviJvid TMXCkoeJ td v A n td oF n n ln td n o rOvoF YP XHBQDOd nVXd TG qsLlh A qzJ EFFECTS OF GRAIN SIZE AND THICKNESS ON CREEP DEFORMATION OF ALUMINIUM THIN FOILS WITH MESOSCALE ZHOU Qing hanical and Electrical Engi Jiangsu Key Lab oratory of Precision and MicroManufacturing Technology College of Mec neering Nanjing University of Aeronautics and Astronautics Nanjing ITOH Goroh Department of Mechanical Engineering College of Engineering Ibaraki University Hitachi Japan Correspondent ZHOU Qing associate pr ofessor Tel Email anzhouqingnuaaeducn Manuscript received in revised form ABSTRACT Constant stress creep exp eriments were carried out at for aluminium thin foils d on the strain with a thickness range of m The eects of the thickness t and the grain size rate were studied and the parameter td can b etter describ e those eects Subgrains were found near the grain b oundary by TEM in the deformed sp ecimen with td which conrmed that the deformation mechanism is dislo cation p owerlaw creep An empirical formula A n td n n ln td n is the stress exp onent of the blo ck meterial was obtained to describ e the relation which basically dep e