冷轧Cu-15Cr原位复合材料组织和性能研究

Study on Microstructure and Properties of Cold-rolling Cu-15Cr In-situ Composite

经冷轧变形和中间退火制备了Cu-15Cr形变原位纤维增强复合薄板材料。用SEM、拉伸试验机和电阻率测试仪研究了变形量及退火温度对Cr纤维形貌、合金强度及导电性能的影响。结果表明:随合金变形量的增加,Cr纤维逐渐变薄、变宽,纤维间距逐渐减小,材料的抗拉强度和导电率都逐渐增大。退火温度升高,材料抗拉强度随之降低,导电率先升高后降低,退火温度为550℃时,导电率峰值为84.4%IACS;退火温度升高,Cr纤维依次发生球化,球化加剧、纤维断裂。最终变形量时,材料达到较好的综合性能匹配,退火前抗拉强度和导电率为694 MPa和78%IACS;500℃退火后抗拉强度和导电率为570 MPa和83%IACS。

Cu-15Cr in-situ composite was successfully prepared by heavy cold rolling and intermediate heat treatment. The effects distortion and heat treatment temperature on the Cr fibre microstructure and properties of the composite were investigated by SEM, tensile test machine and resistance test instrument. The results show that： with increasing deformation, the material＇s tensile strength and conductivity are gradually increasing, Cr fiber grows thinning and wider and fiber spacing decreases gradually. With annealing temperature increased, the material＇s tensile strength decreases gradually. The conductivity increases at first, then decreases, and the peak value of conductivity, 84.4%IACS appears at 550℃. Meanwhile, Cr fiber firstly spheroidizes, then grows and breaks. With the final deformation, the material achieves good comprehensive performance, the tensile strength and conductivity are 694 MPa/78%IACS （unannealed）, 570 MPa/83%IACS （500 ℃）.