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采用液态金属搅拌铸造法制备了K2Ti6O13晶须(PTW)增强AZ91D镁基复合材料,采用动电位极化测试和静态腐蚀试验测试了复合材料的耐腐蚀性能,并利用SEM对复合材料的表面形貌进行了观察和分析。结果表明:PTW对合金铸态组织具有明显的细化作用,而且共晶组织形貌发生明显改变,由完全离异共晶骨骼状的β相转变为部分离异共晶的蜂窝状β相。合金显微组织的细化及β相体积分数的降低,抑制了微电偶腐蚀的破坏作用,提高了AZ91D镁合金的耐蚀性能。
K2Ti6O13 whiskers (PTW) reinforced AZ91D magnesium matrix composites were prepared by liquid metal casting method. The corrosion resistance of the composites was tested by potentiodynamic polarization test and static corrosion test. The surface morphology of the composites Observed and analyzed. The results show that the PTW has obvious thinning effect on the as-cast microstructure of the alloy, and the morphology of the eutectic structure changes obviously. The β phase of the completely dissociated eutectic billet changes into a partially dissociated eutectic honeycomb β phase. The refinement of microstructure and the decrease of β phase volume fraction inhibit the destructive effect of micro galvanic corrosion and improve the corrosion resistance of AZ91D magnesium alloy.