| 放电等离子烧结双相AlCrCoFeNi2.1 高熵合金的微观组织、耐腐蚀性能和力学性能 |
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| 引用本文： | 郑凡林,孙天鸣,池涵娟,陈洪胜,王文先.放电等离子烧结双相AlCrCoFeNi2.1 高熵合金的微观组织、耐腐蚀性能和力学性能[J].稀有金属材料与工程,2022,51(11):4039-4050. |
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| 作者姓名： | 郑凡林 孙天鸣 池涵娟 陈洪胜 王文先 |
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| 作者单位： | 太原理工大学 机械与运载工程学院，太原 山西 030024,太原理工大学 材料科学与工程学院，太原 山西 030024,太原六味斋实业有限公司，太原 山西 030006,太原理工大学 机械与运载工程学院，太原 山西 030024;先进镁基材料山西省重点实验室，太原 山西 030024,太原理工大学 材料科学与工程学院，太原 山西 030024;先进镁基材料山西省重点实验室，太原 山西 030024 |
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| 基金项目： | National Natural Science foundation of China (Grant No51805358, 51775366), key research and development program of Jinzhong (Grant No. Y201023), College Students'' Innovative Entrepreneurial Training Plan Program (Grant No 202010112011) |
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| 摘 要： | 采用放电等离子烧结法在不同温度下制备AlCrCoFeNi2.1高熵合金（HEA），并对其微观组织、耐腐蚀性能和力学性能进行了研究。结果表明，烧结后的AlCrCoFeNi2.1 HEA最大相对密度可达99.18%；该HEA主要由体心立方（bcc）相和面心立方（fcc）相组成，其比例分别为20.6%和79.4%。与fcc相相比，AlCrCoFeNi2.1 HEA中bcc相的再结晶组织和变形组织更多，且bcc相在3.5%（质量分数）NaCl溶液中更容易被腐蚀。随着应变速率的增加，bcc相和fcc相的压力恢复速率降低，硬化效果增强。在1050 ℃下烧结的AlCrCoFeNi2.1 HEA具有较高的极限抗拉伸强度，这主要归因于晶界强化、固溶强化和合金粒子之间良好的界面结合。该HEA的断裂形式包括bcc相的脆性断裂和fcc相的韧性断裂。
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| 关 键 词： | 高熵合金 放电等离子烧结 耐腐蚀性能 力学性能 |
| 收稿时间： | 2021/10/26 0:00:00 |
| 修稿时间： | 2021/12/20 0:00:00 |
Microstructure, Corrosion Resistance, and Mechanical Properties of Biphase AlCrCoFeNi2.1 High Entropy Alloy Prepared by Spark Plasma Sintering |
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| Zheng Fanlin,Sun Tianming,Chi Hanjuan,Chen Hongsheng and Wang Wenxian.Microstructure, Corrosion Resistance, and Mechanical Properties of Biphase AlCrCoFeNi2.1 High Entropy Alloy Prepared by Spark Plasma Sintering[J].Rare Metal Materials and Engineering,2022,51(11):4039-4050. |
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| Authors: | Zheng Fanlin Sun Tianming Chi Hanjuan Chen Hongsheng and Wang Wenxian |
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| Affiliation: | College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, China,College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China,Taiyuan Liuweizhai Industrial Co., Ltd, Taiyuan 030006, China,College of Mechanical and Vehicle Engineering, Taiyuan University of Technology, Taiyuan 030024, China;Shanxi Key Laboratory of Advanced Magnesium-Based Materials, Taiyuan 030024, China,College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China;Shanxi Key Laboratory of Advanced Magnesium-Based Materials, Taiyuan 030024, China |
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| Abstract: | The AlCrCoFeNi2.1 high-entropy alloy (HEA) was prepared by the spark plasma sintering method at different temperatures. The microstructure, corrosion resistance, and mechanical properties of this HEA were investigated. Results show that the maximum relative density of the AlCrCoFeNi2.1 HEA can reach 99.18% after sintering, and the HEA is mainly composed of body-centered cubic (bcc) and face-centered cubic (fcc) phases with the phase fraction of 20.6% and 79.4%, respectively. Compared with that in fcc phase, the fraction of recrystallized and deformed microstructures in bcc phase of AlCrCoFeNi2.1 HEA is higher. In addition, the bcc phase can be easily corroded in 3.5wt% NaCl solution. The pressure recovery rate of bcc and fcc phases is decreased and the hardening effect is enhanced with increasing the strain rate. The higher ultimate tensile strength of AlCrCoFeNi2.1 HEA after sintering at 1050 °C can be achieved due to the grain size strengthening, solid solution strengthening, and good interface bonding between HEA particles. The failure mode of AlCrCoFeNi2.1 HEA includes the brittle fracture of bcc phase and the ductile fracture of fcc phase. |
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| Keywords: | high-entropy alloy spark plasma sintering corrosion resistance mechanical properties |
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