挤压成形对喷射成形7055铝合金热变形行为的影响研究

孟毅; 向进; 刘衍

doi:10.3969/j.issn.1674-6457.2026.02.002

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精密成形工程 ›› 2026, Vol. 18 ›› Issue (2) : 10-20. DOI: 10.3969/j.issn.1674-6457.2026.02.002

兵器工艺技术

挤压成形对喷射成形7055铝合金热变形行为的影响研究

孟毅^1,*, 向进², 刘衍¹

作者信息 +

Effect of Extrusion on Hot Deformation Behavior of Spray Formed 7055 Aluminum Alloy

MENG Yi^1,*, XIANG Jin², LIU Yan¹

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文章历史 +

摘要

目的明确挤压成形对喷射成形7055铝合金后续热变形行为及塑性成形性能的调控作用,为优化复合成形工艺路径提供依据。方法选取喷射态与挤压态7055铝合金为研究对象,采用Gleeble热模拟试验机开展等温压缩实验,对比分析2种状态材料的流变应力特征、动态再结晶行为及热加工性能,并建立Arrhenius型本构模型与热加工图。结果挤压成形显著改善了喷射态合金的热变形行为。与喷射态相比,挤压态合金的热变形激活能降低16.9%,峰值应力平均降低8.5%。在425 ℃、0.01 s^-1条件下,再结晶分数达到59.5%,较喷射态提高15.2%。热加工图表明,挤压态合金具有更宽的安全加工区间（功率耗散因子η>0.34）,变形稳定性明显增强。结论挤压成形通过孔隙致密化、晶粒细化及第二相均匀化的协同调控作用,优化了喷射成形7055铝合金的初始组织状态,从而降低了变形抗力、促进了动态再结晶并拓宽了安全加工窗口。

Abstract

The work aims to clarify the role of extrusion in regulating the subsequent hot deformation behavior and plastic forming performance of spray formed 7055 aluminum alloy, to provide a basis for optimizing the composite forming process path. Isothermal compression tests were conducted with a Gleeble thermal simulator on both as-sprayed and extruded 7055 aluminum alloy. The flow stress characteristics, dynamic recrystallization behavior, and hot processing performance at both states were systematically compared. Constitutive equations based on the Arrhenius-type hyperbolic sine model were established, and processing maps were constructed. The results indicated that the extrusion markedly improved the hot deformation behavior of the alloy. The hot deformation activation energy of the extruded alloy decreased by 16.9%, and the average peak stress was reduced by 8.5% compared with those of as-sprayed alloy. At 425 ℃ and 0.01 s^-1, the recrystallization fraction reached 59.5%, which was 15.2% higher than that of the as-sprayed alloy. Processing maps showed that the extruded alloy exhibited a wider safe processing window (η>0.34) with enhanced deformation stability. Extrusion optimizes the initial microstructure through porosity elimination, grain refinement, and second-phase homogenization, thereby reducing deformation resistance and promoting dynamic recrystallization during subsequent hot deformation.

导出引用

孟毅, 向进, 刘衍. 挤压成形对喷射成形7055铝合金热变形行为的影响研究[J]. 精密成形工程. 2026, 18(2): 10-20 https://doi.org/10.3969/j.issn.1674-6457.2026.02.002

MENG Yi, XIANG Jin, LIU Yan. Effect of Extrusion on Hot Deformation Behavior of Spray Formed 7055 Aluminum Alloy[J]. Journal of Netshape Forming Engineering. 2026, 18(2): 10-20 https://doi.org/10.3969/j.issn.1674-6457.2026.02.002

中图分类号： TG164.1+1 TG31

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