对Cu-0.54%Al2O3弥散强化复合材料的拉伸变形和断裂行为进行了研究.结果表明,经挤压比为30∶1 的热挤压后,复合材料的σb、σ0.2、δ和σ0.2/σb分别高达340 MPa、250 MPa、24%和74%.冷加工后合金的强度随退火温度的升高而逐渐下降,但σ 0.2/σb仍保持较高的值.挤压态合金的加工硬化指数n为0.256,明显低于纯铜.铜基体中均匀弥散分布着平均尺寸为18 nm,间距为100 nm的Al2O3纳米粒子,提高了铜基体的强度,阻碍了高温退火时再结晶的发生,降低了合金的加工硬化速率.挤压态合金的拉伸断口宏观上为杯锥状,微观上表现为明显的韧性断裂特征.
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