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通过电子束接进行厚2219合金接关节的微观结构演变和机械性能
Zhilong Chang1, Minghui Huang1, Xiaobo Wang2
1College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China.
Materials (Basel, Switzerland)
|November 14, 2023
概括
2219合金厚板的电子束接产生了无缺陷的接头. 接区表现出多种微结构和高微硬度,从而产生出色的抗拉强度,但延伸率降低.
科学领域:
- 材料科学 材料科学 材料科学
- 金工业是金工业的一个方面.
- 接工程 接工程
背景情况:
- 2219合金对于航空航天应用至关重要.
- 电子束接 (EBW) 是合金的关键连接技术.
- 了解EBW关节中的微结构-属性关系是必不可少的.
研究的目的:
- 为了研究电子束 2219 合金厚板的微观结构和机械性能.
- 分析沿接区厚度的微观结构的变化.
- 为了将微观结构特征与微硬度和拉伸性能相关联.
主要方法:
- 2219 合金厚板的电子束接.
- 使用光学显微镜和扫描电子显微镜进行微结构分析.
- 在整个接区域进行微硬度测试.
- 拉伸试验用于评估机械性能.
- 破裂表面分析. 破裂表面分析.
主要成果:
- 实现了具有卓越表面质量的无缺陷接头.
- 沿着接区域厚度观察到显著的微观结构变化,上部区域有条纹颗粒,下部区域有细微的等颗粒.
- 接区域由α-Al和Al-Cu欧基组成,由于核化颗粒,部分化的区域有微小的等氧粒.
- 接区域表现出最高的微硬度 (80 HV),这是由于细粒度和高Al-Cu度.
- 拉力强度与基础金属相匹配,但延伸度降至15.1% (67.7%的基础金属).
- 骨折模式是典型的柔性骨折.
结论:
- 电子束接是有效的连接2219合金厚板,产生高质量的连接.
- 沿接厚度的微结构异质性会影响机械性能.
- 高的微硬度和抗拉强度归因于细粒度结构和优质相,而减少的延长率表明了进一步优化的潜力.
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