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通过冷轧变形并结合中间退火制备了Cu-15Cr和Cu-15Cr-0.24Zr形变原位纤维复合薄板材料。采用扫描电子显微镜、拉伸试验机和电阻率测试仪研究了Zr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:Cr纤维随退火温度升高依次发生:边缘球化、晶界开裂和纤维断裂;Zr的加入使Cr纤维球化、断裂行为延迟约100℃;Zr提高了复合材料的抗拉强度,并使其抗软化温度提高100℃;450℃时,Cu-15Cr的抗拉强度/导电率达到良好的匹配,为656 MPa/81.7%IACS,550℃时,Cu-15Cr-0.24Zr的抗拉强度/导电率达到良好的匹配,为722 MPa/81.3%IACS。
Cu-15Cr and Cu-15Cr-0.24Zr in-situ fiber-reinforced composite sheets were prepared by cold-rolling deformation combined with intermediate annealing. The effects of Zr and annealing temperature on the morphology, alloy strength and electrical conductivity of Cr fiber were investigated by scanning electron microscopy, tensile testing machine and electrical resistivity tester. The results show that the Cr spherulites occur in turn as spheroidization, grain boundary cracking and fiber fracture with the increase of annealing temperature. The addition of Zr increases the spheroidization of Cr fiber and the fracture delay is about 100 ℃. Zr increases the tensile strength of the composites, And the softening temperature of the Cu-15Cr alloy increases by 100 ℃. At 450 ℃, the tensile strength and electrical conductivity of Cu-15Cr reach a good match, which is 656 MPa / 81.7% IACS. The tensile strength of Cu-15Cr-0.24Zr at 550 ℃ A good match for strength / conductivity was 722 MPa / 81.3% IACS.