Alternative TitleMolecular Dynamics Simulation of the Structure and Deformation Behavior of γ/α2 Interface in TiAl Alloys
涂爱东1; 滕春禹2; 王皞1; 徐东生1; 傅耘2; 任占勇2; 杨锐1
Source Publication金属学报
Other AbstractTi Al alloys with g-TiAl and α2-Ti3Al dual-phase lamellar structure possess not only excellent high temperature performance but also density only about half of traditional superalloys. Such lamellar structure largely determines the mechanical properties of TiAl alloys. However, there is still a lack of understanding on the atomic structure of lamella, as well as their influence on the mechanical behaviors.For this reason, molecular dynamics with an embedded-atom potential is employed to investigate the energies of both the coherent and semi-coherent γ/α2 interfaces. The interface coherency is found to depend on the thickness ratio of γ lamellae to α2 lamellae, and there exists a critical lamella thickness, below/above which the interface is coherent/semi-coherent. Tensile loading perpendicular to the lamella interface indicates that the yield strength of coherent interface is higher than that of semi-coherent interface and the crack nucleation behavior varies with the thickness ratio of g lamellae to α2 lamellae. The plastic deformation occurs first in the γ region, forming Shockley partial dislocations and then crosses the γ/α2 interface via slip transfer, activating stacking faults on the pyramidal plane in the α2 region. In this process, the γ/α2 interface provides nucleation sites for subsequent dislocations and cracks.
KeywordTiAl 界面 塑性变形 力学行为 分子动力学
Indexed ByCSCD
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Cited Times:2[CSCD]   [CSCD Record]
Document Type期刊论文
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GB/T 7714
涂爱东,滕春禹,王皞,等. Ti-Al合金γ/α2界面结构及拉伸变形行为的分子动力学模拟[J]. 金属学报,2019,55.0(002):291-298.
APA 涂爱东.,滕春禹.,王皞.,徐东生.,傅耘.,...&杨锐.(2019).Ti-Al合金γ/α2界面结构及拉伸变形行为的分子动力学模拟.金属学报,55.0(002),291-298.
MLA 涂爱东,et al."Ti-Al合金γ/α2界面结构及拉伸变形行为的分子动力学模拟".金属学报 55.0.002(2019):291-298.
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