含有不同尺度微裂纹的铝合金伸长率模型  

A Model for the Tensile Ductility of Aluminum Alloy with Various-sized Micro-cracks

作　　者：宋旼[1] 陈康华[1] 齐雄伟[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室

出　　处：《特种铸造及有色合金》2007年第1期3-6,共4页Special Casting & Nonferrous Alloys

摘　　要：基于铝合金在变形过程中形成不同尺度的微裂纹,建立了铝合金伸长率与微米级的结晶相及沿晶界分布的亚微米级的弥散相的非线性解析模型,模型的预测与试验值较为符合。借助模型的理论分析,可以定量地得出不同尺度的结晶相,弥散相含量及尺寸对铝合金伸长率的影响。同时,根据模型的解析结果,提出了改善铝合金伸长率的方法。A nonlinear model was developed to describe the relationship between tensile ductility and constituents in micron scale as well as dispersoids in sub-micron scale in aluminum alloy based on the formation of various-sized micro-cracks during deformation.The model prediction agrees well with the experimental data.Effects of the volume fraction and size of the various-sized constituents and dispersoids on tensile ductility of aluminum alloy can be quantitatively analyzed by means of the model.Meanwhile,measures of improving tensile ductility of aluminum alloy were taken based on the simulated results.

关 键 词：铝合金 伸长率 模型 变形与断裂 

分 类 号：TG115[金属学及工艺—物理冶金]