Effect of composite on the early- and mid-stage precipitation hardening phenomena in Al-Mg-Si (Cu)

复合材料对Al-Mg-Si(Cu)合金早中期沉淀硬化现象的影响

• 批准号: 436629-2012
• 负责人: Esmaeili, Shahrzad
• 金额: $ 2.91万
• 依托单位: University of Waterloo
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2014
• 资助国家: 加拿大
• 起止时间: 2014-01-01 至 2015-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=553068
• 关键词: Effect; composite; early; mid; stage

Al-Mg-Si-(Cu), i.e. AA6xxx, alloys are commonly used as medium strength alloys for automotive, mass transportation, and structural applications. In particular, they are the light alloy of choice for automotive skin panels owing to their specific strength, corrosion resistance, surface appearance, and recyclability. The alloys acquire their desired strength through age hardening treatments, during which phase transformation processes involving a complex sequence of solute atom clustering and precipitation of nano-scale hardening particles take place. Previous studies have provided important information on the effect of alloy composition and/or heat treatment routes on the type of hardening precipitates or changes in precipitation processes. However, the underlying mechanisms for the effect of composition on phase transformations remain ambiguous or unverified. The goal of the proposed work is to use the state-of-the art atomic- and nano-scale characterization techniques, as well as macro-scale testing methods, to acquire a better understanding of the role of composition and aging history on the commercially-important precipitation hardening behaviour in Al-Mg-Si-(Cu) alloys.

Al-Mg-Si-（Cu），即AA 6xxx合金通常用作汽车、大众运输和结构应用的中等强度合金。特别是，由于它们的比强度、耐腐蚀性、表面外观和可回收性，它们是汽车蒙皮板的轻合金选择。合金通过时效硬化处理获得其所需的强度，在时效硬化处理期间发生涉及溶质原子聚集和纳米级硬化颗粒沉淀的复杂序列的相变过程。以前的研究提供了重要的信息，合金成分和/或热处理路线的硬化沉淀物的类型或沉淀过程中的变化的影响。然而，组成对相变的影响的潜在机制仍然是模糊的或未经证实的。 拟议工作的目标是使用最先进的原子和纳米级表征技术，以及宏观尺度的测试方法，以更好地了解成分和老化历史对Al-Mg-Si-（Cu）合金中具有商业重要性的沉淀硬化行为的作用。