Xiong Zhou
(, ), Shiping Wang
(, ), Zhongtao Lu
(, ), Xiege Huang
(, ), Xiaobin Feng
(, ), Jiayi Fu
(, ), Wenjuan Li
(, ), Pengcheng Zhai
(, ), Guodong Li
(, )
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引用次数: 0
Abstract
The lamellar microstructure is one of the most typical microstructures of TiAl alloys. There are three γ/γ interfaces with different microstructures in lamellar γ-TiAl alloys. In this work, we investigated the deformation processes of lamellar γ-TiAl alloys with different interfacial spacing (λ) via uniaxial tensile loading using molecular dynamics simulations, including true twin (TT), pseudo-twin (PT), rotational boundary (RB), and the mixed structure (TT ∥ PT ∥ RB). The results show that in all lamellar γ-TiAl samples, the Shockley partial dislocation prefers to nucleate in the region between two neighboring interfaces. Then, dislocations move towards, crossing the γ/γ interface. Finally, the dislocation slippage leads to the destruction of the interface, resulting in cracks and structural failure. With the decrease of λ, the ultimate strength slightly increases in the TT or PT structure of γ-TiAl, which follows the Hall-Petch relation. But in general, the interfacial spacing has a slight effect on the ultimate strengths of these four structures of γ-TiAl.
期刊介绍:
Acta Mechanica Sinica, sponsored by the Chinese Society of Theoretical and Applied Mechanics, promotes scientific exchanges and collaboration among Chinese scientists in China and abroad. It features high quality, original papers in all aspects of mechanics and mechanical sciences.
Not only does the journal explore the classical subdivisions of theoretical and applied mechanics such as solid and fluid mechanics, it also explores recently emerging areas such as biomechanics and nanomechanics. In addition, the journal investigates analytical, computational, and experimental progresses in all areas of mechanics. Lastly, it encourages research in interdisciplinary subjects, serving as a bridge between mechanics and other branches of engineering and the sciences.
In addition to research papers, Acta Mechanica Sinica publishes reviews, notes, experimental techniques, scientific events, and other special topics of interest.
Related subjects » Classical Continuum Physics - Computational Intelligence and Complexity - Mechanics