Al19.3Co15Cr15Ni50.7高熵合金的热变形行为

doi:10.11900/0412.1961.2020.00349

金属学报

2021, Vol. 57

Issue (10): 1299-1308 DOI: 10.11900/0412.1961.2020.00349

研究论文

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Al_19.3Co₁₅Cr₁₅Ni_50.7高熵合金的热变形行为

刘庆琦, 卢晔, 张翼飞, 范笑锋, 李瑞, 刘兴硕, 佟雪, 于鹏飞, 李工(

)

燕山大学亚稳材料制备技术与科学国家重点实验室秦皇岛 066004

Thermal Deformation Behavior of Al_19.3Co₁₅Cr₁₅Ni_50.7High Entropy Alloy

LIU Qingqi, LU Ye, ZHANG Yifei, FAN Xiaofeng, LI Rui, LIU Xingshuo, TONG Xue, YU Pengfei, LI Gong(

)

State Key Laboratory of Metastable Materials Preparation Technology and Science, Yanshan University, Qinhuangdao 066004, China

引用本文:

刘庆琦, 卢晔, 张翼飞, 范笑锋, 李瑞, 刘兴硕, 佟雪, 于鹏飞, 李工. Al_19.3Co₁₅Cr₁₅Ni_50.7高熵合金的热变形行为[J]. 金属学报, 2021, 57(10): 1299-1308.
Qingqi LIU, Ye LU, Yifei ZHANG, Xiaofeng FAN, Rui LI, Xingshuo LIU, Xue TONG, Pengfei YU, Gong LI. Thermal Deformation Behavior of Al_19.3Co₁₅Cr₁₅Ni_50.7High Entropy Alloy[J]. Acta Metall Sin, 2021, 57(10): 1299-1308.

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摘要:

为研究铸态Al_19.3Co₁₅Cr₁₅Ni_50.7高熵合金的热变形行为，利用Gleeble-3500热模拟试验机对试样进行热压缩实验，获得了在应变速率为0.001~0.1 s^-1和变形温度为973~1273 K条件下的真应力-真应变曲线。根据 Arrhenius模型构建该合金应变为0.1~0.7的流变应力下的本构方程，得出不同应变条件下的变形激活能和材料参数，以应变ε为自变量将材料常数进行6次多项式拟合，并对本构方程进行验证。基于动态材料模型的功率耗散理论和失稳判据构建功率耗散图和失稳图，并将2者叠加，得到应变为0.3~0.7的热加工图。结果表明，1273 K时的流变应力曲线呈现明显的动态回复的特征，其他温度下的流变应力曲线呈现动态再结晶的特征，并且流变应力随变形温度的下降或应变速率的提升而提升。建立本构方程并进行验证，判定系数R² = 0.956，较高的判定系数表明建立的流变应力本构模型能够比较精确地预测合金的流变应力。高温压缩后的SEM结果显示：相比于铸态微观组织，合金经历热变形之后，组织中出现一些空隙与局部塑性流动，长条状的B2相发生了弯折、断裂，且断裂处的长条状B2相被撕裂成连续的片层状。最后基于动态材料模型(DMM)理论计算出热加工图，从而得到优异的热加工区间。

关键词 ：高熵合金, 本构方程, 热变形行为, 热压缩, 热加工图

Abstract：

Al_19.3Co₁₅Cr₁₅Ni_50.7 is a eutectic high entropy alloy with a lamellar structure and good high-temperature properties. To study the thermal deformation behavior of the samples (diameter 8 mm, height 10 mm), the samples were hot compressed using the Gleeble-3500 thermal simulation-testing machine. The true stress-true strain curves were obtained for strain rates between 0.001 and 0.1 s^-1 and deformation temperatures from 973 K to 1273 K. According to the Arrhenius model, the constitutive equation of the alloy in the strain range of 0.1-0.7 is established, and the deformation activation energy and material parameters under different strain conditions were obtained. With the strain (ε) as the independent variable, the material constants are fitted using the sixth order polynomial, such that the material constant of a certain strain, and the constitutive equation of the strain is obtained. Finally, the constitutive equation is verified. Based on the power dissipation theory and instability criterion of the dynamic material model, the power dissipation and instability diagram are constructed, and the hot working diagram in the strain range of 0.3-0.7 for the Al_19.3Co₁₅Cr₁₅Ni_50.7 high entropy alloy is established by the superposition of the two diagrams. The results show that the flow stress curve at 1273 K presents dynamic recovery characteristics, while the flow stress curve at other temperatures presents dynamic recrystallization characteristics, and the flow stress increases with a decrease in the deformation temperature or an increase in the strain rate. The constitutive equation was established and verified, and the decision coefficient R² = 0.956, which was relatively high, indicates that the established flow stress constitutive model could predict the flow stress of the alloy. After high-temperature compression, compared with the as-cast microstructure, the strip-shaped B2 phase has some bending after hot deformation, and even fracture may occur under the condition of a high-strain rate. The original fine lamellar B2 phase grows into coarse lamellar, and based on the dynamic material model (DMM) theory, the stable zone and unstable zone are determined, and the optimal process parameters are determined.

Key words： high entropy alloy constitutive equation thermal deformation behavior thermal compression hot working figure

收稿日期: 2020-09-07

ZTFLH:

TG142.33

基金资助:国家自然科学基金项目(11674274)

作者简介: 刘庆琦，男，1995年生，硕士生

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	刘庆琦
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	范笑锋
	李瑞
	刘兴硕
	佟雪
	于鹏飞
	李工
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链接本文:

https://www.ams.org.cn/CN/10.11900/0412.1961.2020.00349 或 https://www.ams.org.cn/CN/Y2021/V57/I10/1299

图1 Al19.3Co15Cr15Ni50.7高熵合金的XRD谱

图2 铸态Al19.3Co15Cr15Ni50.7合金的BSE-SEM像

图3 不同变形条件下真应力-真应变曲线

表1 Al19.3Co15Cr15Ni50.3高熵合金在不同变形温度下应变为0.3时的应力(σ) (MPa)

图4 σ和lnε˙的关系曲线

图5 lnσ和lnε˙的关系曲线

图6 lnε˙和ln[sinh(ασ)]的关系曲线

图7 ln[sinh(ασ)]和1/T之间的关系曲线

图8 lnZ和ln[sinh(ασ)]的关系曲线

表2 不同应变时Al19.3Co15Cr15Ni50.7高熵合金的参数

表3 拟合关系式(12)中的6次多项式拟合参数表

图9 α、n、lnA、Q与应变的关系曲线

图10 不同变形条件下流变应力实验值与理论计算值的对比

图11 流变应力理论计算值与实验值的比较

图12 1173 K时不同应变速率下Al19.3Co15Cr15Ni50.7热变形样品显微组织的BSE-SEM像(a) 0.001 s-1 (b) 0.01 s-1 (c) 0.1 s-1

图13 不同应变条件下的热加工图(a) ε = 0.3 (b) ε = 0.4 (c) ε = 0.5 (d) ε = 0.6 (e) ε = 0.7

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