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通过感应熔炼、铸造、锻造和冷拔变形制备了Cu-16Fe-2Cr(质量分数,％)原位复合材料,最终线材(其轧制后的冷拔变形量达到η=ln(A_0/A)=5.42,A_0和A分别为冷拔起始和冷拔后线材的横截面面积)的抗拉强度为980 MPa。将Cu基体选择腐蚀后提取出纤维,采用SEM和TEM观察分析纤维相组织形态。在较低的应变量时,一些Fe—Cr纤维保持着与铸态树枝晶相同的bcc单晶结构,选区电子衍射表明纤维已经形成了〈110〉织构。在较高的应变量时,单根Fe-Cr纤维分为一些由晶界隔开的平行亚单元(宽度约为100 nm),通过亚单元共同的[110]衍射获得了晶粒之间的相对取向关系,相邻晶粒的偏差角在11°—82°之间。根据Hall-Petch关系讨论了原位复合材料的强度问题。
Cu-16Fe-2Cr (mass fraction,%) in-situ composites were prepared by induction melting, casting, forging and cold drawing. The final wire (the cold drawn deformation after rolling reached η = ln = 5.42, A_0 and A are the cross-sectional area of the wire after cold drawing and cold drawing, respectively) is 980 MPa. The Cu matrix was selectively etched to extract the fiber, and the morphology of the fiber phase was observed by SEM and TEM. At lower strain, some Fe-Cr fibers retained the same bcc single crystal structure as the as-cast dendrites, and the selective electron diffraction revealed that the fibers had formed a <110> texture. At higher strain, the single Fe-Cr fibers are divided into parallel sub-units separated by grain boundaries (about 100 nm in width), and the intermetallic Relative orientation, the deviation of adjacent grains in the 11 ° -82 ° between. The strength of in-situ composites was discussed according to the Hall-Petch relationship.