Cu-6%Ag合金组织纤维化过程中的应变协调行为

Cu-6％Ag合金（质量分数）原始组织由枝晶偏析的Cu基体和不平衡共晶体两种组成物构成，冷拉拔及中间热处理可导致组织纤维化．通过测量纤维化过程中组成物的尺寸变化以及计算各组成物的名义应变和应变增长率，分析了不同组成物之间的应变协调行为．在不同的变形阶段，两种组成物应变硬化能力不同，导致应变程度和应变增长率存在差别．随合金变形程度的增加，两种组成物在演变为纤维复合组织的过程中，应变程度和应变增长率并不保持一致，表现出一定程度的应变不协调性．

STRAIN COMPATIBILITY BEHAVIOR IN Cu-6%Ag ALLOY DURING DRAWING INTO FILAMENTARY STRUCTURE

Cu-6%Ag (mass fraction) microcomposite,of which the primary structure consists of dendritic Cu matrix and non-equilibrium eutectic colonies,was prepared by heavy cold drawing and intermediate heat treatments.The scales of different microstructural components were determined at different draw ratios and the strain compatibility was discussed by evaluating the strain level and strain increase rate for each microstructural component.The microstructural components display different strain levels and strain increase rates in different ranges of drawing strain because both have different characters of strain hardening.Therefore,the strain level and strain increase rate show a non- synchronous increase between both microstructural components with the increase of draw ratio when the microstructural components evolve from original as-cast morphology into filamentary structure.