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首页> 外文期刊>Materials Science and Engineering >On the rate-dependency of mechanical properties and failure mechanisms of a (γ + α_2) - TiAl/Ti_3Al-Al_2O_3 cermet
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On the rate-dependency of mechanical properties and failure mechanisms of a (γ + α_2) - TiAl/Ti_3Al-Al_2O_3 cermet

机译：关于（γ+α_2） - TiAl / Ti_3Al-Al_2O_3金属陶瓷的机械性能和失效机制的速率依赖性

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This study investigated the rate-dependent mechanical properties and failure of a self-propagating high-temperature synthesized TiAl/Ti_3Al-Al_2O_3 cermet using mechanical testing and advanced microscopy. Quasi-static and dynamic uniaxial compression tests coupled with high-speed imaging and digital image correlation were used to determine the rate-dependency of stress-strain behavior, compressive strength, and failure strain. The stress-strain curves in the dynamic experiments exhibited a series of alternating stress relaxation and strain hardening cycles, where a ～ 1.2 times increase in compressive strength from 2780 ± 60 MPa to 3133 ± 265 MPa, and a ～ 1.6 times increase in failure strain from 0.0166 ± 0.0017 to 0.0264 ± 0.0032 were determined with an increase in strain rates from ～ 10~(-4) s~(-1) to ~ 10~3 s~(-1). It was also found that the cermet exhibits macroscopic surface texturing by examining the high-speed imaging of deformation during testing. Crystalline texturing with profound microstructural evolution in the titanium aluminide phase was found under dynamic loading using microscopy, and this was correlated with the macroscopic surface texturing observed using high-speed imaging and the cyclical stress relaxation and strain hardening behavior in the stress-strain curves. Altogether, this study presents a thorough understanding of the rate-dependency of the TiAl/Ti_3Al-Al_2O_3 cermet with regard to mechanical properties and failure mechanisms and provides insights for modeling and improvement.
机译：本研究研究了使用机械测试和先进的显微镜的自播高温合成的高温合成的TiAl / Ti_3Al-Al_2O_3金属陶瓷的速率依赖性机械性能和失效。用于高速成像和数字图像相关耦合的准静态和动态单轴压缩测试来确定应力 - 应变行为，抗压强度和失效应变的速率依赖性。动态实验中的应力 - 应变曲线表现出一系列交替的应力松弛和应变硬化循环，其中抗压强度从2780±60MPa升高到3133±265MPa的〜1.2倍，并且失效应变增加了〜1.6倍测定0.0166±0.0017至0.0264±0.0032，从〜10〜（-4）S〜（-1）至约10〜3 s〜（-1）的应变率增加。还发现，Cercet通过检查测试期间的变形的高速成像表现出宏观表面纹理。在使用显微镜的动态负载下发现钛铝化钛相中硅化钛相中的晶体纹理，这与使用高速成像和应力 - 应变曲线中的循环应力松弛和应变硬化行为观察到的宏观表面纹理相关。总之，本研究概透了对机械性能和故障机制方面的TiAl / Ti_3AL-AL_2O_3 CERMET的速率依赖性，并为建模和改进提供了见解。

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