Hot cracking in light metal alloys

我的研究项目的首要主题是加工和产品之间的联系，特别强调铸造行业的质量问题。这对加拿大来说是一个重要的行业，尽管已经建立了良好的基础，但在未来几年，无论是在全球竞争加剧还是在减少能源消耗方面，这都将面临严峻的挑战。基于经验的试错设计方法的剩余空间有限。定量的、以数学为基础的工具是必要的，这样制造愿望才能与设计能力相匹配。使用基于计算机的数学模型虚拟设计铸造工艺的能力有可能在未来十年从根本上改变这个行业，导致新的和改进的产品和工艺，并降低能耗。在这个建议中描述的项目是关于了解铝合金的热撕裂。热裂造成的损失继续成为加拿大铸造业和熔焊业的重大经济负担。本研究的目标是开发新的实验方法来表征导致热撕裂的损伤，了解这种损伤演变的机制，并开发一个基于基础的模型来描述这些合金的热撕裂，该模型可以与热应力过程模型结合使用。

The overarching theme of my research program is the linkage between processing and product, with specific emphasis on quality issues in the casting industry. This is an important industry to Canada and, despite being well established, is one facing critical challenges in the years ahead both in terms of increased global competition and reducing energy consumption. There is limited remaining scope for empirical based trial and error design methodologies. Quantitative, mathematically based, tools are needed so that manufacturing aspirations can be matched with design capability. The ability to virtually design casting processes using computer based mathematical models has the potential to radically transform this industry in the next decade, leading to new and improved products and processes and reduced energy consumption. The project described in this proposal is concerned with understanding hot tearing in aluminum alloys. Losses due to hot-cracking continue to represent a significant economic burden to the casting industry and fusion welding industry in Canada. The goal of the proposed research is to develop novel experimental methodologies for the characterization of damage leading to hot tearing, to understanding the mechanisms at play in the evolution of this damage and to develop a fundamental-based model to describe hot tearing in these alloys that may be used in conjunction with thermal-stress process models.