| 合金化Cr优化含Fe过共晶Al-Si合金显微组织及其机制 |
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| 引用本文： | 崔华,侯陇刚,张济山.合金化Cr优化含Fe过共晶Al-Si合金显微组织及其机制[J].稀有金属,2010,34(2). |
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| 作者姓名： | 崔华 侯陇刚 张济山 |
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| 作者单位： | 1. 北京科技大学材料科学与工程学院,北京,100083
2. 北京科技大学新金属材料国家重点实验室,北京,100083 |
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| 基金项目： | 国家重点基础研究发展计划资助项目 |
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| 摘 要： | 采用传统铸造工艺和喷射成形技术制备了无Cr和含Cr的含Fe过共晶Al-Si合金,并利用SEM(EDS)、XRD及DSC对其显微组织、相组成及相变过程进行了研究。结果表明:2%Cr的加入不光使铸态粗大针片状的δ-Al4FeSi2相变为"骨骼状"α-Al(Fe,Cr)Si相,而且使沉积态Al-25Si-5Fe-3Cu合金中短棒状的富铁相(～10μm左右)被尺寸小于3～5μm的颗粒状α-Al(Fe,Cr)Si相所替代,从而细化的组织更有利于合金性能的提高。等温处理实验结果显示沉积态含Cr合金具有较好的组织热稳定性,其主要归因于颗粒状α-Al(Fe,Cr)Si相自身的高温稳定性,而沉积态Al-25Si-5Fe-3Cu合金热稳定差主要由于β-Al5FeSi相的长大和A7Cu2Fe相的形成。另外,结合显微组织和喷射成形工艺特点对沉积态组织形成机制分析发现α-Al(Fe,Cr)Si相有可能通过直接从液相析出和经δ-Al(Fe,Cr)Si相转变而来。
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| 关 键 词： | 喷射成形 过共晶Al-Si合金 显微组织 凝固 |
Microstructure Optimization of Fe-Contained Hypereutectic Al-Si Alloys by Cr-Alloying and Its Mechanism |
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| Cui Hua,Hou Longgang,Zhang Jishan.Microstructure Optimization of Fe-Contained Hypereutectic Al-Si Alloys by Cr-Alloying and Its Mechanism[J].Chinese Journal of Rare Metals,2010,34(2). |
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| Authors: | Cui Hua Hou Longgang Zhang Jishan |
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| Affiliation: | Cui Hua1,Hou Longgang2,Zhang Jishan2(1.School of Materials Science , Engineering,University of Science , Technology Beijing,Beijing 100083,China,2.State Key Laboratory for Advanced Metals , Materials,China) |
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| Abstract: | The Fe-contained hypereutectic Al-Si alloys with or without Cr were prepared via traditional casting process and spray forming technique.The Microstructures,phase components and phase transformation of present alloys were studied using scanning electron microscopy(SEM)with energy diffraction spectrum(EDS),X-ray diffraction(XRD)and differential scanning calorimetry(DSC).The results showed that adding 2%(mass fraction)Cr the Fe-contained hypereutectic Al-Si alloys could not only transform the coarse plate-lik... |
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| Keywords: | spray forming hypereutectic Al-Si alloys microstructures solidification |
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