Abstract A Cu-3Ag-1Zr alloy was fabricated by rapid solidification and cold rolling. The microstructure stability and tensile properties of this alloy after isochronal annealing at 350–900 °C were investigated. The results show that the microstructure of the Cu-3Ag-1Zr alloy after annealing at 350 °C for 1 h is dominated by the high-density dislocations, ultrafine grains, low angle grain boundaries (LABs) and second-phase particles (nano-sized Ag and micro-sized Cu4AgZr), which results in a high tensile strength of 637 MPa and moderate elongation of 12%. When annealed at 400 °C, the particle stimulated nucleation of recrystallization (PSN) occurs, and the fraction of LABs decreases to 38%, but over 90% of grains are smaller than 2 μm. The decreased tensile strength (465 MPa) and increased elongation (30%) are closely related to the fully recrystallized microstructure after annealing at 500 °C. The alloy exhibits excellent thermal stability when annealed between 500 and 800 °C, and no significant coarsening of grains and decrease in strength are observed due to the strong pinning effect of the stable Cu4AgZr particles at boundaries. The coarsening of the Cu4AgZr particles at 900 °C leads to the sharp increase in the grain size and drop of strength.

中文翻译：

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快速凝固冷轧制备Cu-3Ag-1Zr合金的组织稳定性和拉伸性能

摘要 采用快速凝固冷轧方法制备了Cu-3Ag-1Zr合金。研究了该合金在 350-900°C 等时退火后的组织稳定性和拉伸性能。结果表明，Cu-3Ag-1Zr 合金在 350 °C 退火 1 h 后的显微组织以高密度位错、超细晶粒、小角晶界（LABs）和第二相颗粒（纳米-尺寸的 Ag 和微米尺寸的 Cu4AgZr），产生 637 MPa 的高拉伸强度和 12% 的中等伸长率。当在 400 °C 退火时，粒子受激再结晶成核（PSN）发生，LABs 的比例下降到 38%，但超过 90% 的晶粒小于 2 μm。500 °C 退火后，拉伸强度降低（465 MPa）和伸长率增加（30%）与完全再结晶的显微组织密切相关。该合金在 500 至 800 °C 之间退火时表现出优异的热稳定性，并且由于稳定的 Cu4AgZr 颗粒在边界处的强烈钉扎作用，没有观察到明显的晶粒粗化和强度下降。Cu4AgZr 颗粒在 900°C 粗化导致晶粒尺寸急剧增加和强度下降。