非晶Fe粉掺杂Al-12Si合金的高温压缩变形行为

doi:10.13251/j.issn.0254-6051.2020.05.015

摘要/Abstract

摘要： 为提高Al-12Si合金的热变形抗力,并探索非晶Fe粉掺杂对Al-12Si合金热压缩行为的影响和掺杂非晶Fe粉热压缩中的晶化温度等,采用连续挤压技术制备了掺杂10wt%非晶Fe粉与不掺杂非晶Fe粉的Al-12Si合金试样,对试样进行了不同温度和应变速率下的热压缩试验,分析了试样在热压缩中的组织转变,以及采用双曲正弦关系构建了试样的热流变应力方程。结果表明:非晶Fe掺杂试样在450 ℃及以下的热压缩时,Fe维持非晶态,500 ℃时,则已发生晶化;掺杂10wt%非晶Fe粉使Al-12Si合金的热抗变形能力显著提高,其热压缩激活能Q=211.29 kJ/mol,比未掺杂非晶Fe粉的Al-12Si合金试样高40.78 kJ/mol,且热压缩过程中存在动态回复和动态再结晶;利用双曲正弦关系构建试样的热流变应力方程为ε·=4.42×10¹⁴[sinh(0.016 6σ)]^6.13exp(-211 290/RT),线性回归系数高达0.99,即可为非晶Fe粉掺杂试样的热加工提供一定的理论指导。

关键词: 非晶Fe粉, Al-12Si合金, 热压缩行为, 流变应力

Abstract: To improve the hot deformation resistance of Al-12Si alloy and to explore the effect of amorphous Fe powder doping on the hot compression behavior of Al-12Si alloy and the crystallization temperature of doped amorphous Fe powder in hot compression, the Al-12Si alloy specimens without and with doping of 10wt% amorphous Fe powder were prepared by continuous extrusion. The hot-pressing tests at different temperatures and strain rates were carried out to analyze the microstructure transformation of the specimens in hot-pressing, and the heat flux stress equation of the specimen was constructed by hyperbolic sinusoidal relation. The results show that Fe maintains amorphous when the doped alloy specimens are subjected to hot compression at 450 ℃ and below, while the crystallization is occurred at 500 ℃. The hot deformation resistance of the Al-12Si alloy is improved by doping 10wt% amorphous Fe powder, and its hot compression activation energy Q is 211.29 kJ/mol, which is 40.78 kJ/mol higher than that of the undoped alloy. Dynamic recovery and dynamic recrystallization occur during the hot compression. The heat flow stress equation of the doped alloy is constructed by hyperbolic sinusoidal relationship: ε·=4.42×10¹⁴[sinh(0.016 6σ)]^6.13exp(-211 290/RT), with a linear regression coefficient of 0.99. It can provide some theoretical guidance for the hot working of amorphous Fe powder doped specimens.

Key words: amorphous Fe powder, Al-12Si alloy, hot compression behavior, flow stress

中图分类号:

TG146.2

杨浩, 王远, 王修昌. 非晶Fe粉掺杂Al-12Si合金的高温压缩变形行为[J]. 金属热处理, 2020, 45(5): 78-83.

Yang Hao, Wang Yuan, Wang Xiuchang. Hot compression deformation characteristics of Al-12Si alloy doped with amorphous Fe powder[J]. Heat Treatment of Metals, 2020, 45(5): 78-83.

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