期刊
NATURE COMMUNICATIONS
卷 8, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41467-017-01578-1
关键词
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资金
- European Commission [264635]
- Graduate Academy of the TU Dresden within Excellence Initiative of the federal and state governments of Germany
- German Science Foundation (DFG) [EC 111/26-1]
- European Research Council under the ERC Advanced Grant INTELHYB [ERC-2013-ADG-340025]
Ti-alloys represent the principal structural materials in both aerospace development and metallic biomaterials. Key to optimizing their mechanical and functional behaviour is in-depth know-how of their phases and the complex interplay of diffusive vs. displacive phase transformations to permit the tailoring of intricate microstructures across a wide spectrum of configurations. Here, we report on structural changes and phase transformations of Ti-Nb alloys during heating by in situ synchrotron diffraction. These materials exhibit anisotropic thermal expansion yielding some of the largest linear expansion coefficients (+ 163.9 x 10(-6) to -95.1 x 10(-6) degrees C-1) ever reported. Moreover, we describe two pathways leading to the precipitation of the alpha-phase mediated by diffusion-based orthorhombic structures, alpha ''(lean) and alpha ''(iso). Via coupling the lattice parameters to composition both phases evolve into a through rejection of Nb. These findings have the potential to promote new microstructural design approaches for Ti-Nb alloys and beta-stabilized Ti-alloys in general.
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