| Al25Nb20Ti30Zr25低密度高熵合金的组织和性能 |
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| 引用本文： | 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. |
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| 作者姓名： | 刘宏武 李志昂 高帆 李臻熙 王青峰 |
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| 作者单位： | 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 |
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| 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(0.0063σp)]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。
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| 关 键 词： | 高熵合金 组织 热加工 性能 |
| 收稿时间： | 2021-09-18 |
Microstructure and properties of Al25Nb20Ti30Zr25 low density high entropy alloy |
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| 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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| Authors: | Liu Hongwu Li Zhiang Gao Fan Li Zhenxi Wang Qingfeng |
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| Affiliation: | 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 |
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| 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 Zr5Al3phase 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,ε=4.5×1014×sinh(0.0063σp)]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 Φ180 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. |
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| Keywords: | high entropy alloy microstructure hot working properties |
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