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Effects of cooling rate on microstructure and microhardness of directionally solidified Galvalume alloy

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摘要 The influences of cooling rate on the phase constitution,microstructural length scale,and microhardness of directionally solidified Galvalume(Zn-55Al-1.6Si)alloy were investigated by directional solidification experiments at different withdrawal speeds(5,10,20,50,100,200,and 400μm·s^(-1)).The results show that the microstructure of directionally solidified Galvalume alloys is composed of primary Al dendrites,Si-rich phase and(Zn-Al-Si)ternary eutectics at the withdrawal speed ranging from 5 to 400μm·s^(-1).As the withdrawal speed increases,the segregation of Si element intensifies,resulting in an increase in the area fraction of the Si-rich phase.In addition,the primary Al dendrites show significant refinement with an increase in the withdrawal speed.The relationship between the primary dendrite arm spacing(λ_(1))and the thermal parameters of solidification is obtained:λ_(1)=127.3V^(-0.31).Moreover,as the withdrawal speed increases from 5 to 400μm·s^(-1),the microhardness of the alloy increases from 90 HV to 151 HV.This is a combined effect of grain refinement and second-phase strengthening.
出处 《China Foundry》 SCIE EI CAS CSCD 2024年第3期213-220,共8页 中国铸造(英文版)
基金 supported by the Key Science and Technology Projects of Gansu Province(Grant No.22ZD6GB019) Gansu Key Research and Development Project(Grant No.23YFGA0003) Gansu Provincial Joint Research Fund(Grant No.23JRRC0004) Fundamental Research Funds for the Central Universities(Grant No.lzujbky-2022-ey15) the State Key Laboratory of Solidification Processing in NPU(Grant No.SKLSP202204).
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