将含氢等离子蒸发法制备的Al2O3/Al纳米复合粉体冷压成直径为25 mm、厚度为2 mm的块材,并通过620℃,40 min热烧结和变形量为55%的冷轧形变处理使样品的相对密度达到99%.对高致密Al2O3/Al纳米复合材料的拉伸实验表明:其屈服强度σ0.2和断裂强度σb分别为粗晶Al的12-16倍和5-6倍,延伸率δ比同质冷轧粗晶Al约高28%.表征了Al2O3/Al纳米复合材料的结构和热稳定性,研究了晶粒细化的强化效应、非晶Al2O3弥散增强和冷变形加工硬化等对材料强度的影响.探讨了Al2O3/Al纳米复合材料的强化机制.
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