结构和机械性能AlMgSi(Cu) 用动态变形直的挤出物
Dariusz Leśniak1, Józef Zasadziński1, Wojciech Libura1
1Faculty of Non-Ferrous Metals, AGH University of Krakow, 30-059 Kraków, Poland.
Materials (Basel, Switzerland)
|August 29, 2024
概括
挤压型材的动态拉伸显著提高了材料的强度. 这种创新技术在火后,在人工老化之前应用,与传统的静态拉伸相比,产生了更高的微观结构均性和更高的最终抗拉强度 (UTS).
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.
- 机械工程 机械工程
背景情况:
- 挤出型材在人工老化之前经历冷变形 (0.5-2%),以提高稳定性和应变硬化.
- 在人工老化后,这种预处理会影响材料的微观结构和机械性能.
- 传统方法涉及静态拉伸,在优化微观结构变化方面存在局限性.
研究的目的:
- 开发和评估用于挤压型材的创新动态拉伸装置.
- 研究动态拉伸对AlMgSi(Cu) 合金微观结构和机械性能的影响.
- 通过一种新的热力机械处理,增强挤压型材的强度特性和微观结构均性.
主要方法:
- 开发了一种独特的原型装置,用于在火后动态拉伸挤压型材.
- 应用静态 (0.5%在0.02米/秒) 和动态 (0.25-1.5%在0.05和2米/秒) 的拉伸条件.
- 使用光学显微镜 (OM) 和扫描电子显微镜 (SEM) 的微结构分析.
- 通过拉力测试对机械性能进行评估.
主要成果:
- 动态拉伸,特别是在更高的速度 (2米/秒),导致与静态拉伸相比,最终拉伸强度 (UTS) 增加7-18%.
- 动态拉伸的配置文件呈现出更均的微观结构,其中细分散体的比例更高.
- 新的热力学处理导致了有利的微观结构修改和增强强度的特性.
结论:
- 动态拉伸是一种高效的创新,用于改善挤压型材的机械性能.
- 开发的半工业单位和工艺比传统的静态拉伸方法有了显著的进步.
- 通过动态拉伸实现的优化微结构特征有助于提高材料性能.
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