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洞察了通过第一原则计算获得的 γ-TiAl/α₂-Ti₃Al 与 La 兴奋剂的接口特性

Qizhen He¹, Chunmei Zhao¹, Wenwei Song¹

¹State Key Laboratory of Metastable Materials Science & Technology, Hebei key lab for optimizing metal product technology and performance, Yanshan University, Qinhuangdao, 066004, P. R. China. zcmcl@ysu.edu.cn.

Physical chemistry chemical physics : PCCP

|February 27, 2025

概括

兰 (La) 注增强了 (γ-TiAl) /α2- (α2-Ti3Al) 接口的性,通过改变结合和减少能量障碍. 这项研究揭示了L-doping显著改善了TiAl合金的机械性能.

科学领域:

材料科学材料科学材料科学
计算材料科学科学计算材料科学
合金设计设计合金设计

背景情况:

γ-TiAl和α2-Ti3Al相之间的接口强度对于TiAl合金的室温可塑性至关重要.
对γ-TiAl/α2-Ti3Al接口粘合机制的实验阐明具有挑战性.

研究的目的:

调查兰 (La) 兴奋剂对γ-TiAl/α2-Ti3Al接口特性的影响.
了解粘合机制和稳定性,使用和不使用拉斯的接口.

主要方法:

使用第一原则计算来模拟和分析γ-TiAl/α2-Ti3Al接口.
计算包括能量稳定性,电子结构,接口结合和能量,拉力测试和潜在能量表面分析.
构建了γ-TiAl/α2-Ti3Al接口的模型,并模拟了La原子替换.

主要成果:

在Doped 5站点的Doping最小化了接口模型能量,减少了接口绑定和接口能量.
拉引入了La-Al债券,补充了现有的Ti-Ti和Ti-Al债券.
拉伸应力,最大潜在能量和异质滑动的能量障碍被La兴奋剂显著降低,表明增强的延展性.

结论:

兰兴奋剂有效地提高了γ-TiAl/α2-Ti3Al接口的可塑性.
这项研究为通过有针对性的兴奋剂设计改进的TiAl合金提供了计算基础.
通过第一原则计算了解接口特性对于先进材料开发至关重要.

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