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是前过渡金属，A是A族元素，X是C或N，n=1-3）具有不寻常的机械、化学、热和电性能的组合。这一相当独特的属性集的起源，即以前未预见的金属和陶瓷属性的组合是由于它们的纳米层压原子排列。虽然Barsoum和同事1等对Ti 3SiC 2的性质进行了比较好的描述，但关于结构相关化合物的合成和性质的许多基本材料科学问题仍然没有答案：一个这样的实验未探索的问题是弹性和塑性性质对211 MAX相中碳化物形成金属M的价电子构型的依赖性。根据我们最近发表的从头计算结果选择了M2 AlC体系。我们的策略是，一旦合适的生长条件，这些材料被确定和优化，相关的机械性能通过纳米压痕测量与获得的信息，通过结构，化学和键合表征的碳化物形成金属M在M2 AlC的系统变化的价电子配置。通过与已经发表的从头算数据的相关性，我们希望有助于更好地了解这类迷人的固体。