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超聲鑄造7050鋁合金的微觀組織和宏觀偏析規律

Microstructure and macro-segregation law of ultrasonic cast 7050 aluminum alloy ingots

  • 摘要: 采用不同功率超聲對鋁熔體進行處理,研究超聲場對7050鋁合金凝固組織和宏觀偏析的影響規律.結果表明:超聲振動產生的空化效應和聲流效應影響熔體的凝固過程,合理功率的超聲能有效細化晶粒、優化組織及改善宏觀溶質分布.當超聲功率達到170 W時,鑄錠徑向宏觀偏析的弱化效果最好,Zn、Mg和Cu的偏析指數分別為0.0593、0.0565和0.0319;超聲功率超過170 W,溶質元素在中心區域富集量顯著提高,宏觀偏析程度增大.

     

    Abstract: Ultrasonic vibration effects on the microstructure and macro-segregation of 7050 aluminum alloy were investigated by adopting various ultrasonic powers to the aluminum melt. It is found that cavitation effect and acoustic streaming effect, caused by ultrasonic vibration, play a major role in the solidification process. A reasonable ultrasonic power can obviously refine the grains, optimize the microstructure, and improve the homogeneity of solute elements. The maximum decrease of the macro-segregation level occurs at the power of 170 W, and the segregation index values of Zn, Mg, and Cu are 0. 059 3, 0. 056 5, and 0. 031 9, respectively. Exceeding the power of 170 W, the rich level of solute elements in the ingot center enhances greatly and the macro-segregation level increases.

     

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