Al25Nb20Ti30Zr25低密度高熵合金的组织和性能

doi:10.13251/j.issn.0254-6051.2022.02.004

金属热处理 ›› 2022, Vol. 47 ›› Issue (2): 20-25.DOI: 10.13251/j.issn.0254-6051.2022.02.004

Al₂₅Nb₂₀Ti₃₀Zr₂₅低密度高熵合金的组织和性能

刘宏武¹, 李志昂², 高帆¹, 李臻熙¹, 王青峰²

1.中国航发北京航空材料研究院先进钛合金航空科技重点实验室, 北京 100095;
2.燕山大学亚稳材料制备技术与科学国家重点实验室, 河北秦皇岛 066004

收稿日期:2021-09-18 修回日期:2021-11-21 出版日期:2022-02-25 发布日期:2022-04-01
通讯作者: 李臻熙,研究员,E-mail:13641145387@163.com
作者简介:刘宏武(1987—),男,博士,主要研究方向为钛铝合金、高熵合金等高温结构材料的基础与应用,E-mail:liuhongwu0335@163.com。

Microstructure and properties of Al₂₅Nb₂₀Ti₃₀Zr₂₅ low density high entropy alloy

Liu Hongwu¹, Li Zhiang², Gao Fan¹, Li Zhenxi¹, Wang Qingfeng²

1. Aviation Key Laboratory of Science and Technology on Advanced Titanium Alloys, AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China;
2. State Key laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao Hebei 066004, China

Received:2021-09-18 Revised:2021-11-21 Online:2022-02-25 Published:2022-04-01

摘要/Abstract

摘要： 通过Thermo-Calc软件计算、微观组织多尺度表征以及热模拟试验等研究了Al₂₅Nb₂₀Ti₃₀Zr₂₅合金的组织结构、高温组织稳定性和热加工性能。结果表明,Al₂₅Nb₂₀Ti₃₀Zr₂₅合金的铸锭组织主要由BCC基体相和Zr₅Al₃析出相组成,Zr₅Al₃相在BCC晶界连续析出,晶粒内部的Zr₅Al₃相呈块状分布,平均尺寸在750 nm左右;合金在750~1000 ℃保温24 h后,基体中的晶粒尺寸并未发生明显变化;随着温度的增加,Zr₅Al₃相含量小幅度降低,合金的高温组织稳定性较好。建立了合金的本构方程为$\dot{ε}$=4.5×10¹⁴×[sinh(0.0063σ_p)]^2.8exp(-419/RT),并绘制了合金的能量耗散系数图;在1050 ℃/1 s^-1变形条件下,能量耗散系数达到峰值0.69,在该变形条件下等温锻造出尺寸为$\phi$ 180 mm×20 mm完整无开裂的圆形块体材料。锻造消除了原始晶界处连续分布的Zr₅Al₃相,使其分解成短杆状均匀分布于合金基体中,BCC基体组织发生了动态回复和部分再结晶。

关键词: 高熵合金, 组织, 热加工, 性能

Abstract: Microstructure, high temperature structure stability and hot workability of the Al₂₅Nb₂₀Ti₃₀Zr₂₅ alloy were studied by means of Thermo-Calc software calculation, microstructure multi-scale characterization and thermal simulation test. The results show that the ingot microstructure of Al₂₅Nb₂₀Ti₃₀Zr₂₅ alloy is mainly composed of BCC matrix and Zr₅Al₃ precipitates. The Zr₅Al₃ phase is continuously precipitated at the BCC grain boundary. The Zr₅Al₃ phase inside the grains is distributed in a block shape with an average size of about 750 nm. After holding at 750-1000 ℃ for 24 h, the grain size of matrix does not change significantly, with the increase of temperature, the content of Zr₅Al₃ phase is decreased slightly, and the high temperature structure stability of alloy is better. The constitutive equation of the alloy is established, $\dot{ε}$=4.5×10¹⁴[sinh(0.0063σ_p)]^2.8exp(-419/RT), and the energy dissipation coefficient map of the alloy is drawn. Under the deformation condition of 1050 ℃/1 s^-1, the energy dissipation coefficient reaches the peak value of 0.69, and under this deformation condition, a complete forging disc without crack is isothermally forged with a size of $\phi$180 mm×20 mm. The original continuous Zr₅Al₃ phases at grain boundary are decomposed into short rods by forging, which are evenly distributed in the BCC matrix, and the BCC matrix undergoes dynamic recovery and partial recrystallization.

Key words: high entropy alloy, microstructure, hot working, properties

中图分类号:

TG139

刘宏武, 李志昂, 高帆, 李臻熙, 王青峰. Al₂₅Nb₂₀Ti₃₀Zr₂₅低密度高熵合金的组织和性能[J]. 金属热处理, 2022, 47(2): 20-25.

Liu Hongwu, Li Zhiang, Gao Fan, Li Zhenxi, Wang Qingfeng. Microstructure and properties of Al₂₅Nb₂₀Ti₃₀Zr₂₅ low density high entropy alloy[J]. Heat Treatment of Metals, 2022, 47(2): 20-25.

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Al₂₅Nb₂₀Ti₃₀Zr₂₅低密度高熵合金的组织和性能

Microstructure and properties of Al₂₅Nb₂₀Ti₃₀Zr₂₅ low density high entropy alloy

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