Development of Innovative Aluminum Powder Metallurgy (PM) Alloys Utilizing Hybrid Alloying Technology

利用混合合金技术开发创新型铝粉末冶金 (PM) 合金

• 批准号: 250034-2013
• 负责人: Bishop, Donald
• 金额: $ 2.11万
• 依托单位: Dalhousie University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=683064
• 关键词: Development; Innovative; Aluminum; Powder; Metallurgy

The focus of this proposal is aluminum powder metallurgy (PM) processing. This is an emerging near-net-shape metal forming technology wherein aluminum-based powders (and powdered forms of the desired alloying additions) are directly manipulated into geometrically complex components through a sequence of powder compaction, liquid phase sintering, and secondary operations such as heat treatment. Aluminum PM has advanced steadily in recent years principally through the development of new alloys that exhibit a high sintered density (>99%) and in turn, significant improvements in ambient mechanical properties relative to the out dated conventional blends now in use for over 40 years. While the next generation materials open many new applications for aluminum PM processing, new challenges have arisen as well. The most prolific is their propensity for non-uniform shrinkage during sintering. Coming as a result of the intense densification behaviour, it yields distorted sintered products and greatly diminishes the near-net-shape advantage upon which aluminum PM is built. To mitigate the distortion dilemma, the applicant recently designed a concept deemed "hybrid alloying" whereby the sintering particles of aluminum would be strengthened by the addition of a small amount of prealloyed zirconium. This element has a slow diffusion rate in aluminum and forms a refined distribution of Al3Zr particles that are hard, exceptionally fine ((<20nm), thermodynamically stable, and highly resistant to thermal coarsening - attributes that enable the aluminide particles to act as efficient strengthening features throughout the complete sintering cycle. Research on the concept has been restricted to a single base alloy and dilute concentrations of Zr to date yet the results are highly promising and imply that a much broader scope of opportunities exists for the technique. Thus, the objective of this proposal is to expand research on hybrid alloying to maximize the likelihood of widespread commercial adaptation. Activities will address an enhanced fundamental understanding, chemical refinements, the use of hybrid alloying in an array of alloys, and mechanical testing.

该提案的重点是铝粉冶金（PM）加工。 这是一种新兴的近网状金属形成技术，该技术通过一系列粉末压实，液相烧结和二次操作（例如热处理处理）直接将基于铝的粉末（以及所需合金添加的粉末形式）直接操纵到几何复杂的成分中。近年来，铝PM主要通过开发出高烧结密度（> 99％）的新合金稳步发展，而相对于现在使用的超过40年的传统混合物，环境机械性能的显着改善。尽管下一代材料为铝PM处理开放了许多新的应用程序，但也出现了新的挑战。最多产的是它们在烧结过程中对不均匀收缩的倾向。由于强烈的致密性行为，它产生了扭曲的烧结产品，并大大降低了铝制PM的近网状优势。为了缓解失真困境，申请人最近设计了一个被认为是“混合合金”的概念，通过添加少量的预制锆。该元素在铝中具有缓慢的扩散速率，并形成了坚硬，异常精细的AL3ZR颗粒的精致分布（（（（（（<20nm）），热力学上稳定）且对热块状的高度抗性 - 使铝粒子颗粒能够在整个概念上均能进行整个概念，从而使铝粒子充当有效的浓度。高度有希望的，暗示该技术的机会更广泛。