多通道倒冷对Cu-Mg合金机械性能的影响
Yuan Yuan1, Yong Pang2, Zhu Xiao2
1Standards & Metrology Research Institute, China Academy of Railway Sciences Corp., Ltd., Beijing 100081, China.
Materials (Basel, Switzerland)
|December 31, 2025
概括
连接铜-合金电线的高速铁路连线现在是可靠的. 多通冷通过使用严重的剪切变形和独特的粘合机制实现高强度接头,确保无热的导体完整性.
科学领域:
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
- 金工业是金工业的一个方面.
背景情况:
- 连接高强度,冷拉铜 (Cu-Mg) 合金导体对于可靠的高速铁路连锁系统至关重要.
- 当前的连接方法在保持这些先进合金的机械完整性方面面临着挑战.
研究的目的:
- 研究Cu-Mg合金电线的机械性能和微观结构的演变,这些电线通过多通道的倒置冷连接.
- 了解这种无热连接过程中的基本粘合机制.
主要方法:
- 在不需要特殊表面制备的情况下,使用了Cu-0.43重量%Mg合金线的多通道倒置冷.
- 进行了微结构分析 (例如,动态再结晶,纳米层结构,脱位,双胞胎) 和抗拉强度测试.
主要成果:
- 实现了高完整度的接头,其最大抗拉强度为624 MPa (约96%的基材强度).
- 拉力强度达到~90%的原始强度后,四个颠覆通过,与减少回报之后.
- 鉴定了局部严重剪切变形导致的梯度微结构.
结论:
- 提出了一种多阶段的动态粘合机制,包括"机械自清洗",以实现有效的连接.
- 该研究澄清了冷中预应力,高强度合金的粘合原理.
- 为优化工业应用的无热连接技术提供了科学基础.
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