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首页> 外文会议>International Conference on Surface Engineering; 20041029-31; Shenzhen(CN) >Surface nanocrystallization of commercial pure titanium by shot peening
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Surface nanocrystallization of commercial pure titanium by shot peening

机译：市售纯钛表面喷丸表面纳米化

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摘要

The surface nanostructures of commercial pure titanium was realized by the modified shot peening equipment commonly used in industry through the special treatment process. The results show that high-energy-shot-pee-ning(HESP) commonly used to prepare nanostructured surface layers can be achieved by the increase of pill size, pill speed, and treatment time in the commercial shot peening equipment. XRD, SEM and TEM were used to characterize the surface layer microstructure of treated specimens. The analytic results show that the main deformation mode of commercial pure Ti is twinning. At the beginning of deformation, the dislocations are formed and twins occur within or on plane, then twins in intersection plane appear, and at last the twin characteristics disappear in the surface layer after longer treatment time. The deformation layer depth increases with treatment time in a certain period when the pill size and speed are unchanged. And in the severe plastic deformation (SPD) layer in which the twins are not identified easily by using SEM, the nanocrystalline microstructures are found under TEM. The finest grain size in the surface layer is about 40 nm, and the depth of nanostructured layers is over 60 μm. The microhardness of the nanostructured surface layers is enhanced significantly after shot peening compared with that of the initial simple.
机译：商业纯钛的表面纳米结构是通过特殊处理工艺通过工业上常用的改进的喷丸处理设备实现的。结果表明，通过增加药丸喷丸设备中药丸的大小，药丸速度和处理时间，可以实现通常用于制备纳米结构表面层的高能喷丸喷丸（HESP）。用XRD，SEM和TEM表征了处理过的试样的表面层微观结构。分析结果表明，商品纯钛的主要变形模式为孪晶。在变形开始时，位错形成，孪晶出现在平面内或平面上，然后出现相交平面中的孪晶，最后在经过较长的处理时间后，孪晶特性消失在表层。当药丸尺寸和速度不变时，变形层深度在一定时间内随处理时间的增加而增加。并且在严重的塑性变形（SPD）层中，通过扫描电镜难以识别孪晶，在TEM下发现了纳米晶体的微观结构。表面层中最细的晶粒尺寸约为40 nm，纳米结构层的深度超过60μm。与最初的简单处理相比，喷丸处理后纳米结构表面层的显微硬度显着提高。

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