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材料导报  2025, Vol. 39 Issue (16): 24070104-6    https://doi.org/10.11896/cldb.24070104
  金属与金属基复合材料 |
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
李波1,2,*, 许龙1,2, 杨涵1,2, 杜勇3
1 三峡大学湖北石墨增材制造技术与装备工程研究中心,湖北 宜昌 443002
2 三峡大学机械与动力工程学院,湖北 宜昌 443002
3 中南大学粉末冶金国家重点实验室,长沙 410083
The Effects of Homogenization Treatment on the Microstructure and Properties of Age-strengthened Al-Mg-Zn-Sc-Zr Alloy
LI Bo1,2,*, XU Long1,2, YANG Han1,2, DU Yong3
1 Hubei Engineering Research Center for Graphite Additive Manufacturing Technology and Equipment, China Three Gorges University, Yichang 443002, Hubei, China
2 College of Mechanical and Power Engineering, China Three Gorges University, Yichang 443002, Hubei, China
3 State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China
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摘要 利用差示扫描量热仪(DSC)、X射线衍射仪(XRD)、光学显微镜(OM)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、维氏显微硬度计和电导率仪等研究了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。实验结果表明:铸态Al-Mg-Zn-Sc-Zr合金存在严重的枝晶偏析,大量非平衡第二相T-Mg32(A1,Zn)49相沿晶界呈连续网状分布;同时,α-Al基体上还存在少量的初生Al3(Sc,Zr)粒子。DSC曲线显示,铸态Al-Mg-Zn-Sc-Zr合金在465 ℃处存在明显的吸热峰;因此,为避免出现过烧现象,该合金均匀化温度设置为460 ℃。随着均匀化时间从4 h延长到24 h,合金中非平衡第二相T-Mg32(A1,Zn)49相逐渐回溶到α-Al基体中,其体积分数从6.45%下降到0.55%;同时观察到合金中有大量弥散分布的二次Al3(Sc,Zr)粒子析出。随着均匀化时间延长到32 h,合金出现过烧现象。合金的硬度与电导率随均匀化时间的延长均呈现出先上升后下降的趋势,在24 h时合金的硬度与电导率达到最大值(116.71HV、30.3%IACS)。结合微观组织表征和性能分析,确定了铸态Al-Mg-Zn-Sc-Zr合金最佳均匀化工艺为460 ℃/24 h。
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李波
许龙
杨涵
杜勇
关键词:  时效强化Al-Mg-Zn-Sc-Zr合金  均匀化处理  微观组织  Al3(Sc,Zr)粒子    
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
出版日期:  2025-08-25      发布日期:  2025-08-15
ZTFLH:  TG156  
基金资助: 湖北省教育厅重点项目(D20201206);湖北省石墨增材制造技术及装备工程研究中心开放研究基金(HRCGAM202102);国家自然科学基金(52031017)
通讯作者:  李波,三峡大学机械与动力学院副教授、硕士研究生导师。主要从事轻质高强结构材料及其先进成形技术的研究工作。liboctgu@163.com   
引用本文:    
李波, 许龙, 杨涵, 杜勇. 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[J]. 材料导报, 2025, 39(16): 24070104-6.
LI Bo, XU Long, YANG Han, DU Yong. The Effects of Homogenization Treatment on the Microstructure and Properties of Age-strengthened Al-Mg-Zn-Sc-Zr Alloy. Materials Reports, 2025, 39(16): 24070104-6.
链接本文:  
https://www.mater-rep.com/CN/10.11896/cldb.24070104  或          https://www.mater-rep.com/CN/Y2025/V39/I16/24070104
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