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Microstructure and Mechanical Behavior of Cryomilled Al-Mg Composites Reinforced with Nanometric Yttria Partially Stabilized Zirconia

机译:纳米氧化钇部分稳定的氧化锆增强的低温研磨Al-Mg复合材料的组织和力学行为

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摘要

The present work investigated the viability of using nanometric 3 mol% yttria partially stabilized zirconia (3YSZ) as a particulate reinforcement in ultrafine grained aluminum alloy matrix composites. Four types of composite materials, with variable amounts of coarse grain regions and volume fractions of 3YSZ, were fabricated through cryomilling and hot isostatic pressing; one of the materials was extruded. Al-Mg alloy (AA5083) was selected as the matrix alloy. Microstructural characterization revealed that the 3YSZ particles were well dispersed in the Al matrix. The grain sizes of the Al matrix ranged from 77 ± 41 to 362 ± 185 nm depending on the thermomechanical processing. The composite with 2.2 vol% 3YSZ exhibited an ultimate tensile strength of 795 MPa and a strain-to-failure of 1.84%. In contrast, the composite with 10 vol% 3YSZ exhibited an ultimate compressive strength of 611 MPa with 22.5% strain-to-failure; this composite also retained 30% of its room temperature strength at 673 K (400 °C). Evaluation of strengthening mechanisms suggests that Hall-Petch strengthening is a predominant mechanism controlling the achieved strength.
机译:本工作研究了使用纳米3摩尔%氧化钇部分稳定的氧化锆(3YSZ)作为超细晶粒铝合金基复合材料中颗粒增强剂的可行性。通过低温研磨和热等静压制得了四种类型的复合材料,其粗晶区域的数量可变,体积分数为3YSZ。其中一种材料被挤出。选择铝镁合金(AA5083)作为基体合金。微观结构表征表明,3YSZ颗粒很好地分散在Al基体中。根据热机械加工,Al基体的晶粒尺寸在77±41至362±185nm的范围内。 3YSZ为2.2%(体积)的复合材料表现出795 MPa的极限抗拉强度和1.84%的失效应变。相比之下,3YSZ含量为10%(体积)的复合材料的极限抗压强度为611 MPa,破坏应变为22.5%。该复合材料在673 K(400°C)时还保留了其室温强度的30%。对强化机制的评估表明,霍尔-帕奇强化是控制所获得强度的主要机制。

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