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| 高熵修饰的纳米晶合金Fe–ZrNbMoTa的成形与高温稳定性研究 |
| Forming and Thermal Stability of High Entropy Nanocrystalline Fe-ZrNbMoTa Alloy |
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| DOI：10.3969/j.issn.1674-6457.2022.08.006 |
| 中文关键词: 多组分纳米晶 热稳定性 共偏析 晶界能 |
| 英文关键词: multi-component nanocrystalline thermal stability co-segregation grain boundary energy |
| 基金项目:国家重点研发计划(2018YFB2001204) |
| Author Name | Affiliation | | GU Shen-xiang-yu | College of Materials Science and Engineering, China University of Mining and Technology, Jiangsu Xuzhou 221008, China | | WANG Xiao-wei | AVIC Shenyang Aircraft Corporation, Shenyang 110850, China | | WANG Zhen-yu | College of Materials Science and Engineering, China University of Mining and Technology, Jiangsu Xuzhou 221008, China | | WANG Ru-jiang | College of Materials Science and Engineering, China University of Mining and Technology, Jiangsu Xuzhou 221008, China | | ZHAO Li-xin | College of Materials Science and Engineering, China University of Mining and Technology, Jiangsu Xuzhou 221008, China | | CHEN Zheng | College of Materials Science and Engineering, China University of Mining and Technology, Jiangsu Xuzhou 221008, China |
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| 中文摘要: |
| 目的 获得高热稳定性的铁基高熵纳米合金并研究其热稳定性机理。方法 通过高能球磨方法制备了Fe–ZrxNbxMoxTax(x=0.1、0.2、0.5、1，原子数分数)单相纳米合金粉末，在不同的退火处理温度下对退火前后的组织演变与元素偏析行为进行表征。结果 获得了尺寸为15 nm的极细FeZr0.2Nb0.2Mo0.2Ta0.2晶粒，在900 ℃下退火1 h后，平均晶粒尺寸增长到73 nm，有第二相Fe2Ta析出。而纳米晶Fe–Zr1.0Nb1.0Mo1.0Ta1.0合金在同样条件下退火后尺寸为55 nm，同时观察到Fe2Ta和FeZr2析出。结论 高熵元素的加入使该类合金具有较好的热稳定性，而新强化相的析出进一步抑制了高温下的晶粒生长，即Fe–ZrNbMoTa合金在高温下的稳定性主要是受多组分偏析引起晶界处能量降低的热力学机制和与溶质拖拽、钉扎相关的动力学机制共同影响。 |
| 英文摘要: |
| The work aims to obtain iron-based high entropy nanocrystalline alloy with enhanced thermal stability and study its thermal stability mechanism. Single-phase nanocrystalline Fe-ZrxNbxMoxTax (x=0.1, 0.2, 0.5, 1.0, atomic number fraction) alloy powder was prepared by high energy ball milling. Its microstructure evolution and element segregation before and after annealing at different temperature were characterized subsequently. Ultra-fine Fe-Zr0.2Nb0.2Mo0.2Ta0.2 grains of 15 nm were obtained. The average grain size increased to 73 nm after annealing at 900 ℃ for 10 h, and the second phase Fe2Ta was precipitated. The size of nanocrystalline Fe-ZR1.0Nb1.0Mo1.0Ta1.0 alloy was 55 nm after annealing under the same conditions, and Fe2Ta and FeZr2 were precipitated simultaneously. The addition of high entropy elements contributes to good thermal stability of the alloy. The precipitation of new enhanced phase further restrains the growth of grans at high temperature. Namely, the stability of Fe-ZrNbMoTa alloy at high temperature is mainly under the thermodynamic effect of grain boundary energy reduction caused by multicomponent segregation between elements as well as the dynamic effect relevant to solute drag and pinning. |
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