Mechanical-Alloying-Assisted Syntheses of Cobalt-Containing Multi-Component Systems and MAX Phases

含钴多组分系统和 MAX 相的机械合金化辅助合成

• 批准号: 538050-2018
• 负责人: Liu, Rong
• 金额: $ 2.91万
• 依托单位: Carleton University
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 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=687850
• 关键词: Mechanical; Alloying; Assisted; Syntheses; Cobalt

Mechanical alloying (MA) is a materials-processing method that involves the repeated welding, fracturing, and rewelding of a mixture of powder particles, generally in a high energy ball mill, to produce a controlled, very fine microstructure, which results in high performance of the final material. MA-assisted-synthesis is characterized by a combination of mechanical alloying the mixed powder to very fine structure and then sintering. In this research two categories of material will be synthesized utilizing the MA technique. The first is cobalt-containing multi-component system (MCS), which is designed based on the combined concept of cobalt-based superalloy and high-entropy alloy (HEA). The former is also known as Stellite alloy, displaying exceptional properties such as high temperature strength, corrosion, oxidation, wear and erosion resistance, due to the unique chemical composition. The latter is composed of at least five elements in equiatomic or near equiatomic composition, exhibiting various excellent properties such as high hardness, good ductility and high temperature stability, by introduction of extra entropy to stabilize the structure. Different from traditional HEAs, the proposed cobalt-containing MCS alloys still have Co as the major element alloying with Cr, W, Mo, Ni, Mn, etc., but Co content will be reduced compared to Stellite alloys, thus lowering the cost of the alloys. MAX phases are layered ternary carbides and nitrides, making property combination of metallic and ceramic materials, which are popularly employed in extreme environments. In this research, MAX phases, including Cr2AlC, Ti3SiC2, Ti3AlC2, Ti2AlC, and Ti2AlN, potentially for nuclear applications, will also be synthesized with MA to improve their performance by creating very fine grained microstructures. The MA mixed powders will be solidified via special sintering processes such as spark plasma sintering and laser cladding, which enable to produce very fine grained microstructures due to rapid heating and cooling. It is expected that these novel materials synthesized by the advanced process possess superior performance to the existing materials from conventional methods, becoming emerging advanced materials for various industrial applications.

机械合金（MA）是一种材料处理方法，涉及粉末颗粒的重复焊接，破裂和重新焊接，通常在高能球磨机中，以产生受控的，非常细的微观结构，从而导致最终材料的高性能。 MA辅助合成的特征是将机械合金的混合粉末合成到非常细的结构，然后烧结。在这项研究中，将使用MA技术合成两类材料。第一个是含钴的多组分系统（MCS），该系统的设计基于基于钴的超合金和高素质合金（HEA）的组合概念。前者也被称为恒星合金，由于独特的化学成分，表现出诸如高温强度，腐蚀，氧化，磨损和耐腐蚀性的特性。后者由均等或近乎等值组组成的至少五个元素组成，它们通过引入稳定结构的额外熵来表现出各种优异的特性，例如高硬度，良好的延展性和高温稳定性。与传统的HEAS不同，拟议的含钴的MC合金仍然具有与CR，W，W，MO，NI，MN等合金合金的主要元素合金，但是与星状合金相比，CO含量将降低，从而降低合金的成本。最大相是分层的三元碳化物和氮化物，使金属和陶瓷材料的特性组合通常在极端环境中使用。在这项研究中，包括CR2ALC，TI3SIC2，TI3ALC2，TI2ALC和TI2ALN在内的最大阶段也将与MA合成，以通过创建非常细的粒度微观结构来提高其性能。 MA混合粉末将通过特殊的烧结过程（例如火花等离子体烧结和激光覆层）巩固，这使得由于快速加热和冷却而产生非常细的粒度微观结构。预计这些由高级工艺合成的新型材料具有与常规方法相比现有材料的优越性能，成为各种工业应用的新兴材料。