Mechanical properties of MAX phase thin films: The effect of band filling on the elastic properties of M2AlC thin Films (M=Ti, V, Cr)

MAX相薄膜的力学性能：带填充对M2AlC薄膜弹性性能的影响（M=Ti、V、Cr）

• 批准号: 5439181
• 负责人: Professor Jochen M. Schneider, Ph.D.
• 金额: --
• 依托单位: Lehrstuhl für Werkstoffchemie (MCh)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2004
• 资助国家: 德国
• 起止时间: 2003-12-31 至 2006-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5439181?language=en
• 关键词: Mechanical; properties; MAX; phase; thin

Mn+1AXn phases (where M is an early transition metal, A an A group element and X is either C or N, n=1-3) possess an unusual combination of mechanical, chemical, thermal and electrical properties. The origin of this rather unique set of properties, i.e. a previously unforeseen combination of metallic and ceramic Attributes is due to their nanolaminated atomic Arrangement. While the properties of Ti3SiC2 are comparatively well described by Barsoum and coworkers 1 and others, many basic materials science questions with respect to the synthesis and properties of structurally related compounds remain unanswered: One such experimentally unexplored question is the dependence of the elastic and plastic properties on the valence electron configuration of the carbide forming metal M in 211 MAX phases. The M2AlC system was selected based on our recently published ab initio calculations. Our strategy is, once suitable growth conditions for these materials are identified and optimized, to correlate the mechanical properties measured by nanoindentation with the information gained through structure, chemistry and bonding characterization for the systematically varied valence electron configuration of the carbide forming metal M in M2AlC. Through correlation with already published ab initio data we expect to contribute towards a better basic understanding of this fascinating class of solids.

Mn+1axn相（其中M是早期过渡金属，A组元素，X为C或N，N = 1-3）具有机械，化学，热和电气性能的异常组合。这种相当独特的特性集的起源，即金属属性和陶瓷属性的先前不可预见的组合是由于它们的纳米胶质原子布置所致。 While the properties of Ti3SiC2 are comparatively well described by Barsoum and coworkers 1 and others, many basic materials science questions with respect to the synthesis and properties of structurally related compounds remain unanswered: One such experimentally unexplored question is the dependence of the elastic and plastic properties on the valence electron configuration of the carbide forming metal M in 211 MAX phases.根据我们最近发布的从头算计算，选择了M2ALC系统。我们的策略是一旦确定和优化了这些材料的合适的生长条件，就可以将通过纳米识别测量的机械性能与通过结构，化学和键合的信息相关联，用于系统多样性变化的碳化物电子在M2ALC中形成金属M的构型。通过与已经发表的从头算数据的相关性，我们期望有助于对这种迷人的固体类别的更好的基本理解。