冷喷涂增材制造镁/铝双金属热变形行为及热加工性能

张启绪; 刘思桐; 龙锦川; 蔺永诚; 邓磊; 韩旭

doi:10.3969/j.issn.1674-6457.2026.04.007

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精密成形工程 ›› 2026, Vol. 18 ›› Issue (4) : 69-78. DOI: 10.3969/j.issn.1674-6457.2026.04.007

增材制造

冷喷涂增材制造镁/铝双金属热变形行为及热加工性能

张启绪^1a, 刘思桐^1b, 龙锦川^1b,*, 蔺永诚^1b, 邓磊², 韩旭²

作者信息 +

Hot Deformation Behavior and Hot Workability of Mg/Al Bimetals Prepared by Cold Spray Additive Manufacturing

ZHANG Qixu^1a, LIU Sitong^1b, LONG Jinchuan^1b,*, LIN Yongcheng^1b, DENG Lei², HAN Xu²

Author information +

文章历史 +

摘要

目的探究冷喷涂增材制造镁/铝双金属热变形过程中的流变行为及工艺窗口。方法先采用冷喷涂工艺制备镁/铝双金属复合材料,随后在温度523~673 K、应变速率0.001~1 s^-1、最大变形量50%的条件下,开展热压缩变形试验。通过对试验结果进行观察,分析镁/铝双金属的流变曲线特性,建立了基于Z参数的Arrhenius高温本构模型,并计算了不同变形条件下材料的热变形激活能,构建了三维激活能图。此外,利用修正的动态材料模型和Murty流变失稳判据,构建了三维热加工图;通过将二者结合以建立激活能-加工图,获得了材料在不同变形条件下的流变失稳区和安全变形区。结果镁/铝双金属的流变曲线随应变的增加呈现明显的再结晶软化特征,并对变形温度和应变速率因素十分敏感,流变应力随着变形温度的升高和应变速率的降低而减小。结论所建立的高温本构模型能够对不同变形条件下双金属的流变应力进行精确预测;基于激活能-加工图获得的最优热变形工艺窗口为：变形温度530~570 K,应变速率0.001~0.006 s^-1。

Abstract

The work aims to explore flow behavior and process window during hot deformation of Mg/Al bimetals prepared by cold spray additive manufacturing. Firstly, Mg/Al bimetal specimens were fabricated by cold spray. Subsequently, hot-compression tests were conducted at temperatures from 523 K to 673 K, strain rates from 0.001 s^-1 to 1 s^-1 and a maximum true strain of 50%. By analyzing the flow curve characteristics of the Mg/Al bimetal, an Arrhenius-type high-temperature constitutive model based on the Zener-Hollomon parameter was established and the activation energy for hot deformation under various conditions was calculated and displayed as a 3D activation-energy map. In addition, a 3D processing map was constructed with a modified dynamic material model combined with the Murty instability criterion. Superimposing the activation-energy map and the processing map yielded an activation-energy-processing map that delineated flow-instability regimes and safe deformation domains. The flow curves exhibited pronounced dynamic-recrystallization softening with the increasing strain and were highly sensitive to temperature and strain rate. The flow stress decreased as temperature rose and strain rate dropped. The established high-temperature constitutive model is capable of precisely predicting the flow stress of bimetals under different deformation conditions. The optimal process window obtained based on the activation energy-processing map is a temperature range of T=530 K to 570 K and a strain rate of $\dot{\varepsilon}$=0.001-0.006 s^-1.

导出引用

张启绪, 刘思桐, 龙锦川, 蔺永诚, 邓磊, 韩旭. 冷喷涂增材制造镁/铝双金属热变形行为及热加工性能[J]. 精密成形工程. 2026, 18(4): 69-78 https://doi.org/10.3969/j.issn.1674-6457.2026.04.007

ZHANG Qixu, LIU Sitong, LONG Jinchuan, LIN Yongcheng, DENG Lei, HAN Xu. Hot Deformation Behavior and Hot Workability of Mg/Al Bimetals Prepared by Cold Spray Additive Manufacturing[J]. Journal of Netshape Forming Engineering. 2026, 18(4): 69-78 https://doi.org/10.3969/j.issn.1674-6457.2026.04.007

中图分类号： TG319

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