Heterogeneous metals and alloys are a new class of materials with superior mechanical properties.In this paper,we engineered sandwich-structured pure aluminum laminates composed of middle coarse-grained layer and outer fine-grained layer via extrusion,rolling and annealing.By controlling the post-annealing regimes,a larger degree of microstructure heterogeneities such as boundary spacing,misorientation and texture across the hetero-interface were obtained,which resulted in obvious mechanical differences.Ten-sile tests indicated that the 300℃/30 min annealed laminates enabled a relatively high tensile ductility while simultaneously retaining a high strength,which was better than prediction by the rule-of-mixture.To explain the reasons behind it,the evolution of geometrically necessary dislocations and strain gradi-ent at the hetero-interface zone were detected using in-situ tension and microscopic digital image cor-relation technique.It was found that with the increasing applied strain,a significant strain gradient was developed near the interface,which was accommodated by geometrically necessary dislocations,thereby contributing to higher hetero-deformation induced(HDI)strengthening and hardening.

Xiang Chen;Baoxuan Zhang;Qin Zou;Guangsheng Huang;Shuaishuai Liu;Junlei Zhang;Aitao Tang;Bin Jiang;Fusheng Pan

State Key Laboratory of Mechanical Transmission,College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China;National Engineering Research Center for Magnesium Alloys,Chongqing University,Chongqing 400044,China

材料科学技术（英文版）

[1]Xiang Chen;Baoxuan Zhang;Qin Zou;Guangsheng Huang;Shuaishuai Liu;Junlei Zhang;Aitao Tang;Bin Jiang;Fusheng Pan-.Design of pure aluminum laminates with heterostructures for extraordinary strength-ductility synergy)[J].材料科学技术（英文版）,2022(05):193-205

Design,pure,aluminum,laminates,heterostructures,extraordinary,ductility,synergy,Heterogeneous,metals,alloys,are,new,class,materials,superior,mechanical,properties,In,this,paper,engineered,sandwich,structured,composed,middle,coarse,grained,layer,outer,fine,via,extrusion,annealing,By,controlling,post,regimes,larger,degree,microstructure,heterogeneities,such,boundary,spacing,misorientation,texture,across,interface,were,obtained,which,resulted,obvious,differences,Ten,tests,indicated,that,annealed,enabled,relatively,tensile,while,simultaneously,retaining,was,better,than,prediction,rule,mixture,To,explain,reasons,behind,evolution,geometrically,necessary,dislocations,strain,zone,detected,using,situ,tension,microscopic,digital,image,cor,relation,technique,It,found,increasing,applied,significant,gradient,developed,near,accommodated,thereby,contributing,higher,deformation,induced,HDI,strengthening,hardening

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