Effect of cryogenic temperature on the strengthening mechanisms of AZ61 Mg alloy extruded at different temperatures

IF 6.2 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Journal of Materials Research and Technology-Jmr&t Pub Date : 2024-09-11 DOI:10.1016/j.jmrt.2024.09.068
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Abstract

This study investigates the influence of extrusion and deformation temperatures on the mechanical properties of the AZ61 Mg alloy. Increasing the extrusion temperature from 300 to 400 °C led to larger grain size and higher basal texture intensity. At 400 °C, the AZ61 alloy exhibited more Al–Mn phases and fewer Mg17Al12 phases, indicating enhanced dissolution of Mg17Al12 in the α-Mg matrix. Uniaxial tensile tests were conducted at room temperature (RT) and cryogenic temperature (CT, −150 °C). Despite grain growth, a higher yield strength (YS) was achieved at higher extrusion temperatures due to the texture-strengthening mechanism. However, during deformation at CT, the higher YS was primarily attributed to the formation of multiple twinning within individual grains, causing twinning interactions. These twin-interacting boundaries create additional barriers to dislocation movement. Notably, the AZ61 sample extruded at 400 °C demonstrated the formation of stacking faults during deformation at CT, with dislocations accumulating around the faults. This contributed to the best strength without compromising ductility in this sample.

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低温对不同温度下挤压成型的 AZ61 镁合金强化机制的影响
本研究探讨了挤压和变形温度对 AZ61 镁合金机械性能的影响。将挤压温度从 300°C 提高到 400°C,可使晶粒尺寸增大,基底纹理强度提高。400 °C时,AZ61合金显示出更多的Al-Mn相和更少的Mg17Al12相,这表明α-镁基体中Mg17Al12的溶解增强。在室温(RT)和低温(CT,-150 °C)下进行了单轴拉伸试验。尽管存在晶粒生长,但由于质地强化机制,在较高的挤压温度下获得了较高的屈服强度(YS)。然而,在 CT 变形过程中,较高的 YS 主要归因于单个晶粒内形成了多个孪晶,导致孪晶相互作用。这些孪晶相互作用边界为位错运动提供了额外的障碍。值得注意的是,在 400 °C 下挤压的 AZ61 样品在 CT 变形过程中形成了堆积断层,位错在断层周围聚集。这使得该样品在不影响延展性的情况下获得了最佳强度。
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来源期刊
Journal of Materials Research and Technology-Jmr&t
Journal of Materials Research and Technology-Jmr&t Materials Science-Metals and Alloys
CiteScore
8.80
自引率
9.40%
发文量
1877
审稿时长
35 days
期刊介绍: The Journal of Materials Research and Technology is a publication of ABM - Brazilian Metallurgical, Materials and Mining Association - and publishes four issues per year also with a free version online (www.jmrt.com.br). The journal provides an international medium for the publication of theoretical and experimental studies related to Metallurgy, Materials and Minerals research and technology. Appropriate submissions to the Journal of Materials Research and Technology should include scientific and/or engineering factors which affect processes and products in the Metallurgy, Materials and Mining areas.
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