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Structure Determination of Er Doped Ti-Al-Nb Alloy by Neutron Diffraction Analysis

1,2,*, 2,* and 1
1
School of Materials Science and Engineering, Beihang University, Beijing 100191, China
2
Dongguan Neutron Science Center, Institute of High Energy Physics, Chinese Academy of Sciences, Dongguan 523808, China
*
Authors to whom correspondence should be addressed.
Materials 2019, 12(14), 2243; https://doi.org/10.3390/ma12142243
Received: 6 June 2019 / Revised: 7 July 2019 / Accepted: 10 July 2019 / Published: 12 July 2019
(This article belongs to the Section Structure Analysis and Characterization)
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Abstract

Neutron diffraction experiments with both conventional powder diffraction setup and under in-situ compressive loading were conducted to investigate the structural origins of large strength and toughness enhancements in Ti-16Al-27Nb alloy after Er addition. The primary phase is determined to be the ordered B2 structure form, in agreement with the previous electron microscopy study. Lattice strains of {210} and {100} planes were measured as a function of applied stress, and elastic anisotropy was found for both, and strong plastic nonlinearity was discovered for (210) reflection. The grain refinement during plastic deformation was proposed by both the 2D diffraction intensity distribution and SEM observations, while stress-induced martensitic phase transition was not observed in this study. It is believed that the activation of different slip systems and grain refinement might be the structural origin of the novel mechanical properties of this alloy. View Full-Text
Keywords: titanium aluminide alloy; rare-earth alloying; mechanical properties; neutron diffraction; stress; strain titanium aluminide alloy; rare-earth alloying; mechanical properties; neutron diffraction; stress; strain
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Ke, Y.; Tao, J.; Duan, H. Structure Determination of Er Doped Ti-Al-Nb Alloy by Neutron Diffraction Analysis. Materials 2019, 12, 2243.

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