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Investigating the Microstructure, Hardness and Tensile Behavior of Magnesium AZ80 Alloy and AZ80/SiC Nanocomposite Manufactured Through Dual Equal Channel Lateral Extrusion (DECLE)
Metals and Materials International ( IF 3.5 ) Pub Date : 2020-03-30 , DOI: 10.1007/s12540-020-00694-w
M. A. Salevati , A. Imam , R. Seifi , F. Akbaripanah

Abstract

In this study, first, AZ80 magnesium alloy and AZ80/SiC nanocomposite were manufactured through a stir casting approach. Then built samples underwent five passes of DECLE process at a constant temperature of 300 °C. Changes in microstructures, hardness, and tensile strength were measured in the annealed alloy and nanocomposites as well as samples with 1, 3, and 5 passes of DECLE to determine the effects of sic. strengthening nanoparticles and number of the DECLE passes. Results show that there is a most significant decrease in grain size due to adding the nanoparticles. The microstructure of the initial AZ80 samples made by large grains and inhomogeneous structure with an average grain size of 60.3 µm. After five DECEL passes for samples with nanoparticles, the structure is turned into fine and homogenous grains with an average size of 4.5 µm. Along with this decreasing trend in the grain size, hardness shows a 20.7% increasing. The results of the uniaxial tensile test show that yield strength and ultimate tensile strength have increased respectively from 74 to 131.8 MPa for initial samples to 113 and 221.9 MPa in nanocomposites. Finally, their values reach to 191.3 and 288.3 MPa after applying five passes of DECLE process. The results indicate that it is possible to significantly improve the microstructure and mechanical properties of the AZ80 magnesium alloy through enriching by nanoparticles. Using severe plastic deformation processes such as DECLE can induce a further decrease in grain size and significant improvement in the mechanical properties without causing changes in the samples’ dimensions.

Graphic Abstract



中文翻译:

研究通过双等通道横向挤压 (DECLE) 制造的镁 AZ80 合金和 AZ80/SiC 纳米复合材料的微观结构、硬度和拉伸行为

摘要

在本研究中,首先通过搅拌铸造方法制造 AZ80 镁合金和 AZ80/SiC 纳米复合材料。然后构建的样品在 300°C 的恒温下经历了五次 DECLE 过程。测量退火合金和纳米复合材料以及经过 1、3 和 5 次 DECLE 的样品的微观结构、硬度和拉伸强度的变化,以确定 sic 的影响。强化纳米粒子和 DECLE 通行次数。结果表明,由于添加了纳米颗粒,晶粒尺寸的减小最为显着。由大晶粒和不均匀结构制成的初始 AZ80 样品的微观结构,平均晶粒尺寸为 60.3 µm。对于含有纳米颗粒的样品,经过五次 DECEL 通过后,该结构变成了平均尺寸为 4.5 µm 的细小均匀颗粒。随着晶粒尺寸的这种减小趋势,硬度增加了 20.7%。单轴拉伸试验结果表明,纳米复合材料的屈服强度和极限拉伸强度分别从初始样品的 74 MPa 增加到 131.8 MPa,增加到 113 MPa 和 221.9 MPa。最后,在应用五次 DECLE 工艺后,它们的值分别达到 191.3 和 288.3 MPa。结果表明,通过纳米颗粒的富集可以显着改善AZ80镁合金的显微组织和力学性能。使用严重的塑性变形工艺(如 DECLE)可以进一步减小晶粒尺寸并显着改善机械性能,而不会导致样品尺寸发生变化。单轴拉伸试验结果表明,纳米复合材料的屈服强度和极限拉伸强度分别从初始样品的 74 MPa 增加到 131.8 MPa,增加到 113 MPa 和 221.9 MPa。最后,在应用五次 DECLE 工艺后,它们的值分别达到 191.3 和 288.3 MPa。结果表明,通过纳米颗粒的富集可以显着改善AZ80镁合金的显微组织和力学性能。使用严重的塑性变形工艺(如 DECLE)可以进一步减小晶粒尺寸并显着改善机械性能,而不会导致样品尺寸发生变化。单轴拉伸试验结果表明,纳米复合材料的屈服强度和极限拉伸强度分别从初始样品的 74 MPa 增加到 131.8 MPa,增加到 113 MPa 和 221.9 MPa。最后,在应用五次 DECLE 工艺后,它们的值分别达到 191.3 和 288.3 MPa。结果表明,通过纳米颗粒的富集可以显着改善AZ80镁合金的显微组织和力学性能。使用严重的塑性变形工艺(如 DECLE)可以进一步减小晶粒尺寸并显着改善机械性能,而不会导致样品尺寸发生变化。初始样品为 8 MPa,纳米复合材料为 113 和 221.9 MPa。最后,在应用五次 DECLE 工艺后,它们的值分别达到 191.3 和 288.3 MPa。结果表明,通过纳米颗粒的富集可以显着改善AZ80镁合金的显微组织和力学性能。使用严重的塑性变形工艺(如 DECLE)可以进一步减小晶粒尺寸并显着改善机械性能,而不会导致样品尺寸发生变化。初始样品为 8 MPa,纳米复合材料为 113 和 221.9 MPa。最后,在应用五次 DECLE 工艺后,它们的值分别达到 191.3 和 288.3 MPa。结果表明,通过纳米颗粒的富集可以显着改善AZ80镁合金的显微组织和力学性能。使用严重的塑性变形工艺(如 DECLE)可以进一步减小晶粒尺寸并显着改善机械性能,而不会导致样品尺寸发生变化。

图形摘要

更新日期:2020-03-30
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