5059铝合金均匀化金属间相的演变
利用光学显微镜(OM)、扫描电子显微镜(SEM)、透射电镜(TEM)、能谱分析(EDS)、差示扫描量热法(DSC)、X射线衍射(XRD)等手段研究了5059铝合金均匀化热处理过程中金属间相的演变。结果表明:5059铝合金铸锭中枝晶偏析严重,大量难溶金属间相在晶界处呈连续网状分布。难溶金属间相由富含 Zn、Cu 元素的非平衡β(Al3Mg2)相、Fe元素富集的Al6Mn共晶相以及Mg2Si平衡相组成。在均匀化热处理过程中,难溶金属间相发生回溶,并析出大量弥散的β(Al3Mg2)相和短棒状的Al6Mn粒子。根据实验观测及均匀化动力学方程计算结果,得到合金的最佳均匀化热处理制度为(450°C,24...
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Published in | 中国有色金属学报:英文版 no. 12; pp. 3553 - 3560 |
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Main Author | |
Format | Journal Article |
Language | English |
Published |
2013
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Subjects | |
Online Access | Get full text |
ISSN | 1003-6326 |
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Summary: | 利用光学显微镜(OM)、扫描电子显微镜(SEM)、透射电镜(TEM)、能谱分析(EDS)、差示扫描量热法(DSC)、X射线衍射(XRD)等手段研究了5059铝合金均匀化热处理过程中金属间相的演变。结果表明:5059铝合金铸锭中枝晶偏析严重,大量难溶金属间相在晶界处呈连续网状分布。难溶金属间相由富含 Zn、Cu 元素的非平衡β(Al3Mg2)相、Fe元素富集的Al6Mn共晶相以及Mg2Si平衡相组成。在均匀化热处理过程中,难溶金属间相发生回溶,并析出大量弥散的β(Al3Mg2)相和短棒状的Al6Mn粒子。根据实验观测及均匀化动力学方程计算结果,得到合金的最佳均匀化热处理制度为(450°C,24 h)。 |
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Bibliography: | Hai-chun JIANG,Ling-ying YE,Xin-ming ZHANG,Gang GU,Pan ZHANG,Yu-long WU 1. School of Materials Science and Engineering, Central South University, Changsha 410083, China; 2. Key Laboratory of Nonferrous Materials Science and Engineering of Ministry of Education, Central South University, Changsha 410083, China intermetallic phase;5059 aluminum alloy;homogenization;microstructure;evolution 43-1239/TG Intermetallic phase evolution of 5059 aluminum alloy during homogenization was investigated by means of optical microscopy (OM), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive spectrometry (EDS), differential scanning calorimetry (DSC) and X-ray diffraction analysis (XRD). The results show that severe dendritic segregation exists in as-cast alloy. The dissolvable intermetallic phases in as-cast alloy consist of Zn-and Cu-rich non-equilibriumβ(Al3Mg2) phase, Fe-rich eutectic Al6Mn phase and equilibrium Mg2Si phase. During the homogenization, Zn- and Cu-rich non-equilibrium β (Al3Mg2) phase, Fe-rich eutectic Al6Mn phase and equilibrium Mg2Si gradually dissolve into matrix. Fine dispersed β(Al3Mg2) particles and rod-shaped Al6Mn particles form in the Al matrix after homogenization. The proper homogenization processing is at 450 °C for 24 h, which is consistent with the results of homogenizing kinetic analysis. |
ISSN: | 1003-6326 |