Investigation on the deformation mechanism of Ti-5Al-2.5Sn ELI titanium alloy at cryogenic and room temperatures
作者： Xuhu Zhang , Caogen Yao , Shi Wei , Zichuan Lu , Dongfeng Han
DOI: 10.1016/J.MSEA.2021.141380
关键词:
摘要: Abstract In order to investigate the influence of service temperature on mechanical properties Ti-5Al-2.5Sn ELI titanium alloy, tensile tests were performed polycrystalline alloy samples under a wide range from 20 K 300 K. The scanning electron microscopy (SEM), back-scattered diffraction (EBSD) and transmission (TEM) conducted analyze fracture behavior evolution, crystallographic orientation, grain boundary characterization dislocation configuration samples. Besides, deformation mechanism was also thoroughly investigated. Experimental results indicate that displays single slipping at room temperature, whereas coupling twinning behaviors dominate cryogenic temperature. improves plastic capacity by coordinating promoting rotating abilities, which induces acceptable low-temperature elongation occurs frequently with decreasing test On other hand, strengthening effect resulting large number structures contributes ultimate strength
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