过饱和Al-20%Si合金Si相的析出粗化动力学

doi:10.11901/1005.3093.2018.139

材料研究学报

2018, Vol. 32

Issue (10): 743-750 DOI: 10.11901/1005.3093.2018.139

研究论文

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过饱和Al-20%Si合金Si相的析出粗化动力学

胡钟鹏¹, 江峻¹, 廖福锦², 王连登², 朱定一¹(

)

1 福州大学材料科学与工程学院福州 350116
2 福州大学机械工程及自动化学院福州 350116

Kinetics of Precipitation and Coarsening of Si-containing Phases in a Supersaturated Al-20% Si Alloy

Zhongpeng HU¹, Jun JIANG¹, Fujin LIAO², Liandeng WANG², Dingyi ZHU¹(

)

1 School of Materials Science and Engineering, Fuzhou University, Fuzhou 350116, China
2 School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou 350116, China

引用本文:

胡钟鹏, 江峻, 廖福锦, 王连登, 朱定一. 过饱和Al-20%Si合金Si相的析出粗化动力学[J]. 材料研究学报, 2018, 32(10): 743-750.
Zhongpeng HU, Jun JIANG, Fujin LIAO, Liandeng WANG, Dingyi ZHU. Kinetics of Precipitation and Coarsening of Si-containing Phases in a Supersaturated Al-20% Si Alloy[J]. Chinese Journal of Materials Research, 2018, 32(10): 743-750.

全文: PDF(5235 KB) HTML

摘要:

使用差示扫描量热仪(DSC)、扫描电镜(SEM)和X射线衍射仪(XRD)等手段研究了过饱和Al-20%Si合金压铸板在450~550℃热处理过程中组织结构的演变规律和Si相的析出和粗化动力学。结果表明：在高压快速凝固和细化、变质的多重作用下,Al-20%Si合金生成了Si相尺寸细小(Si相平均尺寸<1 μm)的非平衡凝固畸变组织;在退火过程中,α-Al基体的晶格畸变程度有所缓解;Si相的粗化扩散机制接近体扩散控制(粗化指数n接近3),粗化激活能为69.59 kJ/mol;退火温度对粗化速率常数有显著的影响,对粗化指数的影响不明显;在退火初期,随着保温时间的延长合金的抗拉强度呈下降趋势而伸长率呈上升趋势,保温时间超过90 min后抗拉强度和伸长率趋于稳定。

关键词 ：金属材料, 动力学, 退火, Al-20%Si合金, 过饱和

Abstract：

The kinetics of precipitation and coarsening of Si-containing phases and the microstructure evolution of the die-casting plate of supersaturated Al-20%Si alloy during thermal treatment at 450 to 550℃ were investigated by means of differential scanning calorimeter (DSC), scanning electron microscope (SEM), and X-ray diffractometer (XRD). Results show that due to the pressure die casting induced rapid solidification and modification, the Al-20%Si alloy presented a non-equilibrium solidified and distorted microstructure with fine Si-phases (the average size of Si phase grains was less than 1 μm). In the annealing process the lattice distortion of the α-Al matrix was alleviated to some extent and the diffusion mechanism related with the coarsening of Si-phases seemed to be the bulk diffusion control (the coarsening index is approximately 3) with the activation energy of 69.59 kJ/mol. The annealing temperature exerted a significant effect on the coarsening rate constant but not on the coarsening index. In the initial stage of annealing, the tensile strength of the alloy decreased while the elongation increased with the increasing holding time. As the holding time longer than 90 minutes, the tensile strength and elongation both stabilized.

Key words： metallic materials kinetics annealing Al-20%Si alloy supersaturated

收稿日期: 2018-01-31

ZTFLH:

TG146

基金资助:国家国际科技合作专项(2015DFA71350)

作者简介:

作者简介胡钟鹏,男,1992年生,硕士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2018.139 或 https://www.cjmr.org/CN/Y2018/V32/I10/743

图1 Al-20%Si合金压铸板的显微组织

图2 Al-20%Si合金的DSC升温曲线

图3 Al-20%Si合金在不同退火温度保温30 min后的显微组织

图4 Al-20%Si合金在500℃保温不同时间后的显微组织

图5 在不同退火温度保温30 min后α-Al相在高角度区的XRD谱

表1 在不同温度退火后α-Al基体的点阵常数

图6 在不同温度退火后硅相平均尺寸r?与保温时间的对数关系

图7 在不同温度退火后硅相平均尺寸r?3与保温时间的关系

图8 粗化速率常数与退火温度的关系

图9 抗拉强度和伸长率与保温时间的关系

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