均匀化处理对时效强化Al-Mg-Zn-Sc-Zr合金微观组织与性能的影响

doi:10.11896/cldb.24070104

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Abstract The effects of homogenization treatment on the microstructure and properties of an age-strengthened Al-Mg-Zn-Sc-Zr alloy were investigated using differential scanning calorimetry (DSC), X-ray diffraction (XRD), optical microscopy (OM), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Vickers microhardness testing, and electrical conductivity measurements. The experimental results revealed that the as-cast Al-Mg-Zn-Sc-Zr alloy exhibited severe dendritic segregation, with a significant number of non-equilibrium T-Mg₃₂(Al, Zn)₄₉ second phases forming a continuous network along the grain boundaries. Additionally, a small amount of primary Al₃(Sc, Zr) particles were observed within the α-Al matrix. The DSC curve indicated a distinct endothermic peak at 465 ℃ for the as-cast alloy; therefore, to prevent overburning, the homogenization temperature was set at 460 ℃. As the homogenization time was extended from 4 hours to 24 hours, the non-equilibrium T-Mg₃₂(Al, Zn)₄₉ second phases gradually dissolved back into the α-Al matrix, reducing their volume fraction from 6.45% to 0.55%. Simultaneously, a significant precipitation of dispersed secondary Al₃(Sc, Zr) particles was observed. However, when the homogenization time was further extended to 32 hours, signs of overburning were detected. With the extension of homogenization time, the hardness and conductivity of the alloy increased first and then declined, and reached the maximum values of 116.71HV and 30.3%IACS at 24 hours. Based on the microstructural characterization and performance analysis, the optimal homogenization process for the as-cast Al-Mg-Zn-Sc-Zr alloy was determined to be 460 ℃ for 24 hours

Key words： aging-strengthened Al-Mg-Zn-Sc-Zr alloy homogenization treatment microstructure Al₃(Sc,Zr) particle

Published: 25 August 2025 Online: 2025-08-15

CLC number:

TG156

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	LI Bo
	XU Long
	YANG Han
	DU Yong

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LI Bo,XU Long,YANG Han, et al. The Effects of Homogenization Treatment on the Microstructure and Properties of Age-strengthened Al-Mg-Zn-Sc-Zr Alloy[J]. Materials Reports, 2025, 39(16): 24070104-6.

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https://www.mater-rep.com/EN/10.11896/cldb.24070104 OR https://www.mater-rep.com/EN/Y2025/V39/I16/24070104

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