The formation mechanisms of surface nanocrystallites in β-type biomedical TiNbZrFe alloy by surface mechanical attrition treatment
The formation mechanisms of surface nanocrystallites in β-type biomedical TiNbZrFe alloy by surface mechanical attrition treatment
复制标题
表面机械磨损处理β型生物医用TiNbZrFe合金表面纳米微晶的形成机制
DOI：
10.1016/j.apsusc.2015.04.137
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发表时间：
2015-08
影响因子：
6.7
通讯作者：
Lian Zhou
中科院分区：
文献类型：
--
作者：
Lei Jin;Wenfang Cui;Xiu Song;Lian Zhou
采用表面机械研磨处理（SMAT）技术，在生物医用β型TiNbZrFe合金表面成功制备出纳米结构表面层。结果表明，当表面处理时间为60 min时，沿沿着处理表面到无应变基体的深度，表层可分为纳米晶层（0-30 μm）、高密度位错区（30-200 μm）和低密度位错和孪晶区（200-700 μm）。表面层的显微硬度随着处理时间的延长而提高。虽然{1 1 2}孪晶<1 1 1>协调形变和位错，但这种协调只发生在低应变区，并不影响纳米晶的形成。TiNbZrFe合金的自纳米化主要归因于位错运动。首先，位错开始运动，容易沿沿着某些晶向形成位错带;然后，位错的多次滑移逐渐形成位错缠结;之后，高密度位错缠结增加，将初生晶粒分割成许多小的畴区。由于高应变能在这些区域之间的界面上积累，可以在相邻的小畴区域之间驱动晶格旋转，最终导致大量具有低或大角度晶界的纳米晶区域。
A nanostructured surface layer was successfully performed on a biomedical β-type TiNbZrFe alloy by surface mechanical attrition treatment (SMAT). The results reveal that the surface layer along the depth from treated surface to strain-free matrix could be divided into an outer nanocrystalline layer (0–30 μm), a high-density dislocation region (30–200 μm) and an inner region with low-density dislocations and twins (200–700 μm) when the surface was treated for 60 min. The microhardness of the surface layer is enhanced and increases with increasing treatment time. Although the {1 1 2} <1 1 1> twin coordinates the deformations with dislocations, this coordination only occurs in the low strain area and cannot affect the nanocrystalline formation. The self-nanocrystallization of TiNbZrFe alloy is mainly attributed to dislocation movements. First, the dislocations start to move and easily form dislocation bands along certain crystal directions; then, multiple slips of dislocations gradually form dislocation tangles; after that, high-density dislocation tangles increases, which divides primary grains into many small domain areas. As high strain energies accumulate on the interfaces among these areas, the lattice rotation can be driven between the adjacent small domain areas, finally resulting in a large number of nanocrystalline regions with low or large angle grain boundaries.
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DOI：
10.1016/j.msea.2011.09.090
发表时间：
2011-12
影响因子：
6.4
作者：
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通讯作者：
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影响因子：
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影响因子：
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影响因子：
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