利用4道次搅拌摩擦加工(FSP)工艺，分别将粒径为20 nm 的单斜晶 ZrO2(M-ZrO2)颗粒和40 nm 的正方晶 ZrO2(T-ZrO2)颗粒添加到 AZ31镁合金中制备了 ZrO2颗粒增强镁基复合材料，研究了复合材料的显微组织与力学性能，并与无强化颗粒 FSP 镁合金的进行了对比。结果表明：M-ZrO2颗粒和 T-ZrO2颗粒增强镁基复合材料的晶粒尺寸分别约为6μm 和2μm；两种 ZrO2颗粒均弥散分布于复合材料中，且均未与基体反应生成新物相；ZrO2颗粒可有效提高镁合金的硬度、屈服强度和抗拉强度，且 T-ZrO2颗粒的强化效果更好；无强化颗粒 FSP 镁合金与 M-ZrO2颗粒增强复合材料拉伸断口均具有混合断裂特征，前者的韧性断裂特征较明显，后者的脆性断裂特征较明显。
Four-pass friction stir processing (FSP)was applied to incorporate AZ31 magnesium alloy with 20 nm M-ZrO 2 particle and 40 nm T-ZrO 2 particle respectively,and thus ZrO 2 particles reinforced magnesium-based composites were fabricated.Microstructure and mechanical properties of the composites were investigated,and compared with FSP sample without reinforced particle.Results show that the size of grains in stir zone of M-ZrO 2 particle and T-ZrO 2 particle reinforced magnesium-based composites was 6 μm and 2 μm,respectively.Both kinds of ZrO 2 particles dispersed in stir zone and did not combine with matrix to form new phase.ZrO 2 particles could increase microhardness,yield strength and tensile strength of the magnesium alloy,and T-ZrO 2 particle had a better strengthening effect.The tensile fracture of the FSP sample without reinforced particle and with M-ZrO2 particle both presented mixed fracture characteristics,and the former was incline to ductile fracture and the latter to brittle fracture.
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