A multi-process approach towards the development of novel Mg alloys

开发新型镁合金的多工艺方法

• 批准号: RGPIN-2021-02449
• 负责人: Bichler, Lukas
• 金额: $ 2.84万
• 依托单位: University of British Columbia
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=743793
• 关键词: multi; process; approach; towards; development

For decades, technological advancements have been driven by the progress in materials science. For example, the substitution of iron components in automobiles with lighter aluminum components during the 1970's and 80's resulted in an immediate performance and fuel economy enhancement. In light of the global climatic challenges, governments internationally are mandating automakers to drastically decrease greenhouse gas emissions and improve fuel economy of vehicles, otherwise face economic penalties. It is generally accepted that the required improvement is achievable either by vehicle hybridization, or by vehicle weight reduction. Both approaches face challenges: 1) Hybridization is costly and adds weight to vehicles, and 2) Existing manufacturing processes for lightweight alloys are approaching technological limits and further advancements are costly.     In this Discovery program, we will explore an innovative multi-process approach to overcome the limits associated with existing manufacturing methods for ultralight high-strength magnesium (Mg) alloys. Specifically, an advanced powder metallurgy process (Spark Plasma Sintering, SPS) will be combined with a traditional metalcasting process to develop novel Mg alloy composites containing graphene-based additives. A critical goal will be to develop composites suitable for mass production, yet remaining cost efficient. Using SPS, graphene-based additives (e.g., graphene, graphene oxide or reduced graphene oxide) will be combined with Mg powder and sintered to form a master alloy. The sintered master alloy will be then subsequently added to liquid Mg alloys during casting operations, resulting in the dissolution of the Mg master alloy within the melt, followed by the release of the graphene-based additives in the melt. The additives will serve to simultaneously enhance the strength and ductility (via grain refinement and the modification of eutectics) and thermo-electric properties of the alloys. Using this approach, several critical challenges (e.g., particle settling, flotation or oxidation) associated with current treatment methods for liquid Mg alloys will be surpassed. Further, the novel composite alloys will be particularly tailored towards applications in the next-generation of hybrid / electric vehicles.     In addition to developing novel alloys for mass-produced Mg parts, our group will also investigate the effect of SPS process parameters and powder morphology on the sinterability of the master alloys and their interaction with the graphene-based additives. The generated knowledge will enable sintering of materials with precisely controlled microstructure and properties.     Experimental work in both areas will be carried out at my UBC laboratories and will provide HQP hands-on and fundamental knowledge in the fields of manufacturing and materials science. This program will provide a foundation for a novel approach to develop castable high-strength Mg alloys.

几十年来，技术进步一直是材料科学进步的推动。例如，在1970年代和80年代，在具有较轻的铝制组件的汽车中取代铁成分导致了直接性能和燃油经济性的增强。鉴于全球气候挑战，国际政府要求汽车制造商大大降低温室气体的排放并改善车辆的燃油经济性，否则面临经济处罚。人们普遍认为，所需的改进是通过车辆杂交或减轻车辆重量来实现的。两种方法都面临着挑战：1）杂交成本高昂，增加了车辆的重量，2）现有的轻质合金制造工艺正在接近技术限制，并且进一步的进步成本很高。在此发现计划中，我们将探索一种创新的多进程方法，以克服与现有的超轻高强度镁（MG）合金相关的限制。具体而言，先进的粉末冶金工艺（Spark等离子体烧结，SPS）将与传统的金属播放工艺相结合，以开发含有基于石墨烯的添加剂的新型MG合金组成。一个关键的目标是开发适合大规模生产的构图，但仍保持成本效益。使用SPS，将将基于石墨烯的添加剂（例如石墨烯，氧化石墨烯或氧化石墨烯还原）与MG粉末结合使用，并烧结以形成主合金。然后，烧结的主合金将随后在铸造操作过程中添加到液体MG合金中，从而导致MG Master合金在熔体内溶解，然后在熔体中释放基于石墨烯的添加剂。这些添加剂将简单地提高合金的强度和延展性（通过晶粒的细化和Eutectics的修饰）和热电特性。使用这种方法，将面临一些与液体MG合金治疗方法相关的一些关键挑战（例如，颗粒设置，浮选或氧化）。此外，新型的复合合金将特别针对在混合动力 /电动汽车的下一代应用中量身定制。除了开发用于批量生产的MG零件的新型合金外，我们的组还将研究SPS过程参数和粉末形态对主合金碰撞性的影响以及它们与基于石墨烯的添加剂的相互作用。生成的知识将使具有精确控制的微观结构和特性的材料烧结。在我的UBC实验室将进行两个领域的实验性工作，并将在制造业和材料科学领域提供HQP动手和基本知识。该程序将为一种新型方法提供基础，以开发可铸造的高强度MG合金。