| 程军.变形量对(CoNiV)97Al3中熵合金组织和力学性能的影响[J].有色金属材料与工程,2024,45(3):1-8. |
| 变形量对(CoNiV)97Al3中熵合金组织和力学性能的影响 |
| Effect of deformation on microstructure and mechanical properties of (CoNiV)97Al3 medium entropy alloy |
| |
| DOI：10.13258/j.cnki.nmme.20240402002 |
| 中文关键词: 中熵合金 热处理 变形量 微观组织 力学性能 |
| 英文关键词:medium entropy alloy heat treatment deformation microstructure mechanical properties |
| 基金项目:国家自然科学基金资助项目（52271249）；陕西省重点研发计划资助项目（2023-YBGY-488） |
|
| 摘要点击次数: 19 |
| 全文下载次数: 590 |
| 中文摘要: |
| 高强度和高塑性的中熵合金，相较于传统合金能够满足更多的实际应用。通过在CoNiV合金中掺入微量Al，经过退火处理来提高其力学性能。制备了不同Al含量的铸态(CoNiV)100-xAlx（x为1、2、3、4、5，原子分数/%）合金。采用万能试验机、维氏硬度计、X射线衍射仪、光学显微镜、扫描电子显微镜、透射电子显微镜，研究了退火温度、Al含量及拉伸变形量对合金力学性能、显微组织的影响。实验结果表明，随着Al含量的增加，合金的伸长率提升到30%以上，维氏硬度从755.8降低到375.6。经过1 000 ℃退火处理后的合金达到更高的强度?塑性平衡，伸长率可达到35%以上，拉伸屈服强度较高（超过950 MPa）。实验选择(CoNiV)97Al3（Al3）中熵合金作为研究对象，将系统分析拉伸变形量（50%、100%）对Al3合金微观组织及力学性能的影响。Al3合金在拉伸变形过程中，位错滑移主导变形，孪晶增加位错存储量，促进位错滑移堆积，该合金变形?断裂过程的主要为位错与孪晶的协同作用。 |
| 英文摘要: |
| Compared with traditional alloys, medium entropy alloys with excellent properties such as high strength and high plasticity can satisfy more practical applications. In this paper, the mechanical properties of CoNiV alloy were improved by adding small amounts of Al into the alloy and annealing at different temperatures. As-cast (CoNiV)100-xAlx (x = 1, 2, 3, 4, 5 atom fraction/%) alloys with different Al content were prepared. Using a universal testing machine, Vickers hardness tester, X-ray diffractometer, optical microscope, scanning electron microscope, transmission electron microscope, the effects of annealing temperature, Al content and tensile deformation on mechanical properties and microstructure of the alloy were studied. The results show that with the increase of Al content, the tensile elongation of the alloy increases to more than 30%, and the Vickers hardness increases from 755. 8 down to 375.6. After annealed at 1000 ℃, the alloy reaches a higher strength-plasticity equilibrium, the elongation can reach more than 35%, and the tensile yield strength is higher (more than 950 MPa). In this experiment, the (CoNiV)97Al3(Al3) was selected as the research object. The effects of tensile deformation (50%, 100%) on the microstructure and mechanical properties of Al3 alloy were systematically analyzed. During the tensile deformation of Al3 alloy, the dislocation slip dominates the deformation, and the twins increase the dislocation storage and promote the dislocation slip accumulation. |
| HTML 查看全文 查看/发表评论 下载PDF阅读器 |
|
|
|
