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首页> 外文期刊>Materials Science and Engineering >Characterization of the near-surface nanocrystalline microstructure of ultrasonically treated Ti-6Al-4V using ASTAR™/precession electron diffraction technique
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Characterization of the near-surface nanocrystalline microstructure of ultrasonically treated Ti-6Al-4V using ASTAR™/precession electron diffraction technique

机译:使用ASTAR™/旋进电子衍射技术表征超声处理过的Ti-6Al-4V的近表面纳米晶体微结构

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摘要

The surface of Ti-6Al-4V was treated mechanically by applying ultrasonic nanocrystal surface modification. The effect of this treatment on the hardness, compressive residual stresses and fatigue performance were investigated. It is shown that in terms of the measured nanoindentation hardness values and the presence of compressive residual stresses, the treated sample only differed from the as-received sample in the first 200-300 urn area far from the surface. Also, the microstructure very close to the treated surface (< 5 um) was characterized using a relatively new transmission orientation microscopy technique named ASTAR™/preces-sion electron diffraction. Based on different types of results (e.g., index map and virtual bright field image) acquired by this technique, it is concluded that titanium grains smaller than 10 nm exist within the distance of less than 1 um from the treated surface. Difficulties associated with ASTAR™/precession electron diffraction technique to characterize this challenging near-surface area are discussed.
机译:通过施加超声纳米晶体表面改性对Ti-6Al-4V的表面进行机械处理。研究了这种处理对硬度,压缩残余应力和疲劳性能的影响。结果表明,就测得的纳米压痕硬度值和压缩残余应力的存在而言,在距表面较远的前200-300微米范围内,处理过的样品仅与原样有所不同。另外,使用称为ASTAR™/精密电子衍射的相对较新的透射取向显微镜技术,可以对非常接近被处理表面(<5 um)的微观结构进行表征。根据通过该技术获得的不同类型的结果(例如,索引图和虚拟亮场图像),可以得出结论,在距处理表面不到1 um的距离内存在小于10 nm的钛晶粒。讨论了与表征这种具有挑战性的近表面区域的ASTAR™/旋进电子衍射技术相关的困难。

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