喷射成形Al-22Si-5Fe合金的热变形行为及组织稳定性
收稿日期: 2010-03-10
修回日期: 2010-05-05
网络出版日期: 2010-07-11
基金资助
国家重点基础研究发展计划资助项目2006CB605204
HOT DEFORMATION BEHAVIOR AND MICROSTRUCTURAL STABILITY OF SPRAY FORMED Al-22Si-5Fe ALLOY
Received date: 2010-03-10
Revised date: 2010-05-05
Online published: 2010-07-11
Supported by
Supported by National Basic Research Program of China (No.2006CB605204)
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
蔡元华 , 张济山 , 梁瑞光 , 苏占培 . 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 . DOI: 10.3724/SP.J.1037.2010.00119
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.
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