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首页> 外文期刊>Scripta materialia >In situ scanning electron microscopy observations of tensile deformation in a boron-modified Ti-6Al-4V alloy
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In situ scanning electron microscopy observations of tensile deformation in a boron-modified Ti-6Al-4V alloy

机译：硼改性Ti-6Al-4V合金拉伸变形的原位扫描电子显微镜观察

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摘要

In situ scanning electron microscopy was performed during both room temperature and 480 deg C tensile deformation of a boron-modified Ti-6Al-4V alloy, in order to characterize the deformation evolution. The sequence of observable surface deformation events was: TiB whisker microcracking at stresses well below the global yield stress, multiple and extensive TiB cracking after global yielding, alpha + beta phase slip emanating from the cracked TiB whiskers, localized shear band formation and propagation leading to cracking in the alpha + beta phases, and ductile sample failure. TiB cracking was also observed throughout the subsurface locations on post-deformed samples. The early microcracking of TiB particles did not degrade mechanical properties, and higher tensile and ultimate strengths were obtained with a ductile fracture mode at quasi-static tensile elongations equivalent to conventional Ti-6Al-4V.
机译：为了表征变形演化，在硼改性的Ti-6Al-4V合金的室温和480℃拉伸变形过程中进行了原位扫描电子显微镜观察。可观察到的表面变形事件的顺序是：在远低于整体屈服应力的应力下发生TiB晶须微裂纹，在整体屈服后发生多次且广泛的TiB裂纹，裂纹的TiB晶须产生α+β相滑移，局部剪切带形成并扩散，从而导致α+β相破裂，延展性样品失效。在变形后样品的整个地下位置也观察到TiB裂纹。 TiB颗粒的早期微裂纹不会降低机械性能，并且在与常规Ti-6Al-4V等效的准静态拉伸伸长率下，具有延性断裂模式的拉伸强度和极限强度更高。

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