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金属学报  2010, Vol. 46 Issue (7): 814-820    DOI: 10.3724/SP.J.1037.2010.00119
  论文 本期目录 | 过刊浏览 |
喷射成形Al-22Si-5Fe合金的热变形行为及组织稳定性
蔡元华1), 梁瑞光2), 苏占培2), 张济山1)
1) 北京科技大学新金属材料国家重点实验室, 北京 100083
2) 山东省济宁市任城区农业机械管理局, 济宁 272000
HOT DEFORMATION BEHAVIOR AND MICROSTRUCTURAL STABILITY OF SPRAY FORMED Al-22Si-5Fe ALLOY
CAI Yuanhua1), LIANG Ruiguang2), SU Zhanpei2),  ZHANG Jishan1)
1) State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083
2) Agricultural Machine Management Bureau of Rencheng District, Jining 272000
引用本文:

蔡元华 梁瑞光 苏占培 张济山 . 喷射成形Al-22Si-5Fe合金的热变形行为及组织稳定性[J]. 金属学报, 2010, 46(7): 814-820.
, , , . HOT DEFORMATION BEHAVIOR AND MICROSTRUCTURAL STABILITY OF SPRAY FORMED Al-22Si-5Fe ALLOY[J]. Acta Metall Sin, 2010, 46(7): 814-820.

全文: PDF(1075 KB)  
摘要: 

采用Gleeble-1500热模拟试验机在变形温度为573-723 K, 应变速率为0.005-0.05 s-1, 最大变形量为30%的条件下对喷射成形Al-22Si-5Fe合金进行热模拟实验, 同时利用OM和XRD对其组织稳定性进行了研究. 结果表明, 过共晶Al-22Si-5Fe合金的热变形行为同样可用包含Zener-Hollomon参数的模型来处理; 低温变形时, 沉积合金的变形激活能与纯Al的自扩散激活能一致, 较高温度下的变形激活能明显高于纯Al的自扩散激活能, 说明沉积合金中大量的第二相对变形会产生显著的影响; 较低温加热时, 沉积合金中的Si 颗粒变化不明显, 当加热温度在698 K或以上温度时, 过共晶Al-22Si-5Fe沉积合金中的Si颗粒将明显长大; 在整个实验温度范围内, 富Fe的金属间化合物颗粒几乎未发生变化.

关键词 Al-22Si-5Fe合金喷射成形热变形组织稳定性Z参数    
Abstract

Hot deformation behavior of spray forming Al-22Si-5Fe alloy at different deformation temperatures with isothermal constant strain rates of 0.005, 0.01, 0.03, and 0.05 s-1 was investigated by using Gleeble-1500 thermo-mechanical simulator, with maximum strain of 30%, the microstructures were studied by using of OM and XRD method. The experimental results showed that the hot deformation behavior of spray formed alloy could also be described by a model containing Z parameter (Zener-Hollomon parameter). The calculated deformation activation energy of the studied alloy was consistent with the self-diffusion activation energy of Al atoms at lower deformation temperature, and much higher than the self-diffusion activation energy of Al atoms at higher temperature because of the influences of large content hard constitutes such as prime Si and Fe-bearing intermetallics. The Si particles changed little when deformed at low temperature, but coarsened obviously when deformed at elevated temperature of 698 K or above. The heating temperature had no obvious effect on the sizes of Fe-bearing intermetallics.

收稿日期: 2010-03-10     
基金资助:

国家重点基础研究发展计划资助项目2006CB605204

作者简介: 蔡元华, 男, 1969年生, 博士

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