Cu-0．2Zr合金和Cu-3Ag-0．5Zr合金的高温蠕变行为

摘要

High temperature （700,800,900 K）tensile creep behavior and creep mechanism of Cu-0. 2Zr alloy and Cu-3Ag-0. 5Zr alloy were studied. The results indicate that the creep resistance of Cu-Zr alloy was better than that of Cu-Ag-Zr alloy. At temperature of 700 K, viscous dislocation slip was the creep process control mechanism of two alloys. At temperature of 800 K, the creep process of two alloys was mainly controlled by grain boundary diffusion mechanism. High temperature creep fracture of two alloys showed ductile intergranular fracture with secondary cracks, there were marly cacities on the fracture of the Cu-Zr alloy. Creep rupture data of two alloys corresponded with the Monkman-Grant relationship.%研究了Cu-0．2Zr（质量分数／％，下同）合金和Cu-3Ag-0．5Zr合金在700，800，900K下的拉伸蠕变行为，并分析了两种合金的蠕变机理。结果表明：铜一锆合金的抗蠕变性能优于铜-银-锆合金的；在700K的蠕变区，位错粘滞滑移是两种合金蠕变过程的控制机制，在800K的蠕变区，两种合金的蠕变过程主要由晶界扩散机制所控制；高温蠕变断裂时两种合金均表现为韧性沿晶断裂，并存在二次裂纹，铜一锆合金断口的孔洞较多，两种合金的蠕变断裂数据符合Monkman-Grant关系。