Interference phenomena in nanocrystalline materials and their application in the microstructure analysis
David RafajaV. KlemmChristina WüstefeldMykhaylo MotylenkoMilan DopitaM. SchwarzT. BarsukovaEdwin Kroke
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Abstract Pure titanium and Ti-6Al-4V alloy powders are treated by a mechanical milling process, which is one of the severe plastic deformation processes. The mechanical milling enables to produce a nano-grain microstructure very easily and has been applied to many powder materials. The bimodal microstructure in those mechanically milled powders is composed of a nano-grain structure with a grain size of about 50 nm in the surface-near region and of a work-hardened microstructure in the core region of the powder. We applied the hot roll sintering process to pure titanium and to Ti-6Al-4V mechanically milled powders. These compacts have a hybrid microstructure that consists of nano-grain structure with grain sizes of 200 to 500 nm and a micron size meso-grain structure. The hybrid microstructure materials demonstrate enhanced mechanical properties compared to conventional materials.
Titanium alloy
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Preface Introduction Early Works and the Way Bone Mineral was Conceived Synthesis of Nanocrystalline Apatites Characterization of Apatites A Model for Nanocrystalline Apatites Physico-Chemical Properties of Nanocrystalline Apatites Processing of Nanocrystalline Apatite-Based Biomaterials Biological Properties of Nanocrystalline Apatites Conclusion Index.
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The characteristics and the synthesis principle of nanocrystalline materials prepared by electrodeposition are summaried in this paper. The research status of nanocrystalline materials and the common methods preparing nanocrystalline materials are reviewed, such as direct current electrodeposition, pulse electrodeposition, composite electrodeposition and jet electrodeposition. Finally, some prospects on development and applications of nanocrystalline materials in material science are proposed in this paper.
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