在Al-5.6Zn-2.5Mg-1.6Cu-0.2Cr合金中微观结构,机械性能和腐蚀行为,添加了微小的
Ting Yao1, Daihong Xiao2, Yingjie Yan2,3
1Shaanxi Nonferrous Yulin New Material Group Co., Ltd., Yulin 719099, China.
Materials (Basel, Switzerland)
|February 26, 2025
概括
将 (Y) 添加到Al-Zn-Mg-Cu合金中,可以改进微观结构并增强颗粒间耐腐蚀性. 然而,较高的伊特含量会对剥落腐蚀性产生负面影响.
科学领域:
- 材料科学与工程 材料科学与工程
- 金工业是一种金工业.
- 腐蚀科学 腐蚀科学
背景情况:
- 高强度合金在航空航天和汽车工业中至关重要.
- 了解合金元素对微观结构和性能的影响对于材料开发至关重要.
- 众所周知,稀土元素,如,会影响合金性能.
研究的目的:
- 研究 (Y) 添加对Al-5.6Zn-2.5Mg-1.6Cu-0.20Cr合金的微观结构,机械性能和腐蚀行为的影响.
- 为了确定最佳的伊含量,以提高合金性能.
- 阐明对合金特性影响背后的机制.
主要方法:
- 系统地将伊 (Y) 添加到基础合金中.
- 使用X射线衍射 (XRD),拉力测试,腐蚀分析和电子显微镜进行全面的表征.
- 微结构分析包括二次阶段粒子大小,粒度边界特征,脱位密度和沉物演变.
主要成果:
- 的添加导致了二次相粒子的显著提炼.
- 观察到增加了低角度谷物边界 (LAGB) 密度,脱位密度和亚谷物形成.
- 报告指出,降水量为η'的体积分数增加,降水区减少.
- 0.1%重量%的Y添加显著改善了颗粒间耐腐蚀性 (最大深度减少到107.8微米).
- 脱皮耐腐蚀性与增加的伊含量呈反向相关性.
结论:
- 的添加提炼了Al-Zn-Mg-Cu合金的微观结构,促进了亚粒的形成并增加了沉密度.
- 特定的伊含量 (0.1重量%) 优化了颗粒间耐腐蚀性.
- 伊对腐蚀行为的影响取决于度,不同腐蚀类型之间存在潜在的权衡.
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