Journal
CAILIAO GONGCHENG-JOURNAL OF MATERIALS ENGINEERING
Volume 50, Issue 11, Pages 101-108Publisher
BEIJING INST AERONAUTICAL MATERIALS-BIAM
DOI: 10.11868/j.issn.1001-4381.2021.001006
Keywords
Ercontaining Al-Mg-Znalloy; stabilization; intergranularcorrosion; T phase; mechanical property
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The effect of annealing treatment on the tensile properties, intergranular corrosion, macrostructure, and microstructure of Al-6.0Mg-1.0Zn-0.8Mn-0.2Cu-0.2Er-0.1Zr hot-rolled plate was studied. The optimal stabilization process for the hot-rolled plate was determined to be at 250 degrees C for 2 hours, based on the mechanical properties and corrosion resistance. The TEM analysis revealed that the T phase within the grains gradually grew and re-dissolved after annealing, with a change in morphology from square to short rod. The T phase at the grain boundaries showed good corrosion resistance.
Effectofannealingtreatmentontensileproperties,intergranularcorrosion,macrostructure and microstructure of Al-6.0Mg-1.0Zn-0.8Mn-0.2Cu-0.2Er-0.1Zr hot-rolledplateasstudied by hardnesstesting,tensiletesting,intergranularcorrosion,OM,EBSD and TEM.Theresultsshow thatthestabilization work windowoftheplateis230 degrees C/18h,240 degrees C/6hand250-270 degrees C/2h.After 250 degrees C /2h,thealloyplatepresentsthebestcomprehensiveperformancewith263 MPayieldstrength and6.732 mg/cm2 massloss.250 degrees C/2hisselectedastheoptimalstabilizationprocessforhotrolled platebycombiningthemechanicalpropertiesandcorrosionresistance.Throughselectedareaelectron diffraction (SEAD)andenergyspectrum analysis,thesecondphaseatthegrainboundaryandinthe grainareallthe T-Mg32 (AlZn)49 phases.Afterannealingat250 degrees C/2 h,the T phasein grains graduallygrowsupandre-dissolves,andthe morphologychangesfrom squaretoshortrod.The T phaseare discontinuous and the spacing becomes larger at grain boundary,which shows good corrosionresistance.
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