連續(xù)柱狀晶組織純銅室溫超延展變形機理

連續(xù)柱狀晶組織純銅室溫超延展變形機理Extreme plastic extensibility mechanism of continuous columnar-grained copper at ambient temperature

通過下引式連續(xù)定向凝固設備，調控合理的工藝參數(shù)制備出表面光潔、單一á100？取向的柱狀晶銅桿。然后經(jīng)室溫拉拔(不經(jīng)過中間熱處理)，表現(xiàn)出超延展變形。通過組織觀察和性能分析，發(fā)現(xiàn)其塑性變形可以分為3個階段：一般硬化階段(ε≤4.13)，低硬化速率階段(4.13≤ε≤10.16)，部分亞微米等軸晶粒形成階段(ε≥10.16)。每個階段的塑性變形行為各有不同，各有其特點。研究結果全面地概括連續(xù)柱狀晶組織銅桿在室溫拉拔過程中的變形機理，同時也為超細銅絲的制備提供必要的理論依據(jù)。

The smooth surface and single á100？ oriented columnar-grained copper rods were prepared by downward continuous unidirectional solidification equipments with reasonable process parameters, then, the copper rods were drawn at ambient temperature (without intermediate heat treatment), which exhibits the extreme plastic extensibility. The results show that the plastic deformation of the copper rod can be divided into three different stages by observation of its microstructure and properties, general hardening stage (ε≤4.13), low hardening rate stage (4.13≤ε≤10.16). Some submicron equiaxed grain forming stage (ε≥10.16). Each stage of the plastic deformation behavior is different and has its own characteristics. Not only the drawing mechanism of continuous columnar-grained copper rods at ambient temperature was comprehensively summarized, but also the necessary theoretical basis for the preparation of ultrafine copper wire was provided.

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