Effect of Er and Si Co-Microalloying on Mechanical Properties and Microstructures of Alcumg Alloys

Liang, Shangshang; Ma, Jianyong; Guo, Kan; Wen, Shuguang; Wei, Wu; Wu, Xiaolan; Huang, Hui; Gao, Kunyuan; Liu, Baosheng; Xiong, Xiang‐Yuan; Nie, Zuoren

doi:10.2139/ssrn.4333721

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“…However, with the change of the times, the requirements for aircraft performance were becoming more and more stringent, which had prompted researchers to seek ways to improve the mechanical properties of 7055 aluminum alloy. Through continuous exploration and research, researchers had found that it was possible to improve the microstructure and properties of aluminum alloys [2,3] by various heat treatment processes [4], changing the composition of alloying elements and micro-alloying elements. By adding Sc, Er, Sm, La, Ce and other rare earth elements could change the microstructure of aluminum alloy and improve its comprehensive mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Effect of SM+Er and Heat Treatment on As-Cast Microstructure and Mechanical Properties of 7055 Aluminum Alloy

Wang¹,

Li²

2023

Preprint

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The cast grains of the 7055 aluminum alloy were refined by adding Sm + Er, and the proper heat treatment procedure was utilized to further precipitate the rare earth phase in order to increase the alloy's strength and toughness. The grain size, microstructure and phase were characterized by optical microscopes (OM), Scanning electron microscopy - energy spectrum (SEM-EDS), XRD diffractometer (XRD). The macroscopic hardness, yield strength and tensile strength of alloy materials were measured by hardness meter and universal electronic tensile machine. The results shown that the as-cast sample and the heat treatment sample all exist Al10Cu7Sm2 and Al8Cu4Er rare earth phase; But after heat treatment, the volume percentage of the rare earth phase dramatically increased and the dispersion was more unified. When 0.3wt.%Sm and 0.1wt.%Er were added, the grain size could be refined to 53μm. With the increase of the total content of rare earth elements, the refining effect first increased and then decreased. Under 410 oC solid solution for 2h + 150oC aging for 12h, the macroscopic hardness, yield strength, tensile strength and elongation of 0.3wt.%Sm + 0.1wt.%Er+7055 as-cast sample were 155.8HV, 620.5Mpa, 658.1Mpa, and 11.90%, respectively.

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Section: Introductionmentioning

confidence: 99%