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| AlFeCoNiMo0.2高熵合金热变形行为及热加工图 |
| Hot Deformation Behavior and Processing Map of AlFeCoNiMo0.2 High-Entropy Alloy |
| Received:June 17, 2021 |
| DOI：10.3969/j.issn.1674-6457.2021.06.012 |
| 中文关键词: 高熵合金 热变形 本构方程 热加工图 |
| 英文关键词: high-entropy alloy hot deformation constitutive equation hot processing map |
| 基金项目: |
| Author Name | Affiliation | | SONG Fan-ce | School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China | | LI Jian-lin | School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China | | HAN Jin-ke | School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China | | PENG Yu-han | School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China | | ZHOU Ge | School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China | | CHEN Li-jia | School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China | | CAO Xue | AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China |
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| 中文摘要: |
| 目的 确定AlFeCoNiMo0.2高熵合金的热加工工艺参数，为该合金热挤压工艺的制定及优化提供有效依据。方法 采用Gleeble-3800热模拟试验机，在变形温度为900~1150 ℃，应变速率为0.001~1 s−1，真应变量为0.6的条件下对AlFeCoNiMo0.2高熵合金进行热压缩实验。基于Arrhennius模型对热压缩实验数据进行拟合，建立AlFeCoNiMo0.2高熵合金的Arrhennius本构方程，并绘制AlFeCoNiMo0.2高熵合金在不同真应变下的热加工图。结果 AlFeCoNiMo0.2高熵合金的流变应力值与应变速率呈正相关，与变形温度呈负相关;Arrhennius热变形本构方程的平均相对误差为3.97%;该合金热加工图中的流变失稳区分别为900~1120 ℃/ 0.1~1 s−1和1120～1150 ℃/0.2~1 s−1;热加工安全区为1075~1150 ℃/0.001~0.01s−1;最佳热加工工艺参数为:1090~1125 ℃/0.001~0.002 s−1。结论 AlFeCoNiMo0.2高熵合金的热变形过程为加工硬化和动态再结晶为主的动态软化，建立的Arrhennius本构方程可较好地描述该合金的热变形行为，绘制的热加工图可为该合金热挤压工艺的制定及优化提供有效指导。 |
| 英文摘要: |
| The work aims to determine the hot process parameters of AlFeCoNiMo0.2 high-entropy alloy, and provide an effective basis for formulation and optimization of thermal extrusion process. The Gleeble-3800 thermal simulation machine was used to conduct a hot compression experiment on the AlFeCoNiMo0.2 high-entropy alloy under the conditions of deformation temperature from 900 to 1150 ℃, strain rate from 0.001 to 1 s−1, and true strain of 0.6. Based on Arrhennius model, the thermal compression experiment data were fitted, the Arrhennius constitutive equation of the AlFeCoNiMo0.2 high-entropy alloy was established, and the hot processing maps of AlFeCoNiMo0.2 high-entropy alloy under different true strains were drawn. The flow stress values of the AlFeCoNiMo0.2 high-entropy alloy were positively correlated with the strain rate and negatively correlated with the deformation temperature. The average absolute relative error of the constitutive equation was 3.97%. The flow instability areas in the hot processing maps of this alloy had a temperature of 900~1120 ℃/0.1~1 s−1 and 1120~1150 ℃/0.2~1 s−1. The hot processing safety area had a temperature of 1075~1150 ℃/0.001~0.01 s−1. The best hot processing parameter was 1090~1125 ℃/0.001~0.002 s−1. The hot deformation process of AlFeCoNiMo0.2 high-entropy alloy is work hardening and dynamic softening based on dynamic recrystallization. The Arrhennius constitutive equation can better describe the hot deformation behavior of this alloy. The hot processing maps can provide effective guidance for formulating and optimizing the thermal extrusion process of this alloy. |
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