Mechanical Performances of Al-Si-Mg Alloy with Dilute Sc and Sr Elements

Zhang, Zichen; Zhao, Qingfeng; Liu, Lihua; Xia, Xingchuan; Zheng, Chen; Quan, Liwei; Ding, Jian; Chen, Xueguang; Luo, Xudong; Wang, Lisheng; Song, Kaihong; Li, Chong; Liu, Yongchang

doi:10.3390/ma13030665

Cited by 4 publications

(1 citation statement)

References 36 publications

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“…Aluminum alloys have gained wide applications in the aeronautics and spaceflight industry for their superior comprehensive properties, such as being lightweight, with excellent mechanical performance, good corrosion resistance and castability [ 1 , 2 , 3 ]. However, it is difficult to consistently produce sound castings by traditional casting methods due to the existence of microporosity and coarse microstructures [ 4 , 5 ] which degrade the mechanical properties of aluminum alloy castings.…”

Section: Introductionmentioning

confidence: 99%

Optimizing the Microstructure and Mechanical Properties of Vacuum Counter-Pressure Casting ZL114A Aluminum Alloy via Ultrasonic Treatment

Huang

Yan

et al. 2020

Materials

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The effect of ultrasonic temperature on density, microstructure and mechanical properties of vacuum counter-pressure casting ZL114A alloy during solidification was investigated by optical microscopy (OM), scanning electron microscope (SEM) and a tensile test. The results show that compared with the traditional vacuum counter-pressure casting aluminum alloy, the primary phase and eutectic silicon of the alloy with ultrasonic treatment has been greatly refined due to the dendrites broken by ultrasonic vibration. However, the refining effect of ultrasonic treatment on vacuum counter-pressure casting aluminum alloy will be significantly affected by ultrasonic temperature. When the ultrasonic temperature increases from 680 °C to 720 °C, the primary phase is gradually refined, and the morphology of eutectic silicon also changes from coarse needle-like flakes to fine short rods. With a further increase in the ultrasonic temperature, the microstructure will coarse again. The tensile strength and elongation of vacuum counter-pressure casting ZL114A alloy increases first and then decreases with the increase of ultrasonic temperature. The optimal mechanical properties were achieved with tensile strength of 327 MPa and the elongation of 5.57% at ultrasonic temperature of 720 °C, which is 6.3% and 8.2%, respectively, higher than that of alloy without ultrasonic treatment.

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