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Effect of heat treatment on the crystallographic orientation evolution in a near-alpha titanium alloy Ti60
Zhao, Z. B.; Wang, Q. J.; Liu, J. R.; Yang, R.; Wang, QJ (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China.
2017-06-01
Source PublicationACTA MATERIALIA
ISSN1359-6454
Volume131Pages:305-314
AbstractThe crystallographic orientation of equiaxed primary alpha (alpha p) phase is one of the main factors that determine the final texture/microtexture and mechanical properties for near-alpha titanium alloys. By annealing a forged Ti60 alloy pancake at 1030 and 1040 degrees C in the alpha+beta two-phase field, two homogeneous bimodal microstructures were obtained, the intensity of secondary alpha in the (0001) pole figure increasing with the annealing temperature. In this study, the influence of annealing temperature on the crystallographic orientation evolution in the pancake was studied using an electron backscattered diffraction analysis method. In particular, a misorientation angle theta associated with (beta Delta J beta(BOR)) that could quantitatively evaluate the deviation of the orientation relationship (OR) between alpha(p) and the surrounding 13 grains from Burgers OR was used to understand the role of the alpha(p) phase, which is considered as an anisotropic precipitate, in the texture evolution during annealing in the two-phase field. It was found that the alpha(p) grains with small theta are more readily preserved during the annealing, while their pinning effect is relatively small, resulting in faster growth of the neighboring 13 grains. A possible effect of heterogeneous local orientation distribution on the microstructure during the annealing process is also discussed. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.; The crystallographic orientation of equiaxed primary alpha (alpha p) phase is one of the main factors that determine the final texture/microtexture and mechanical properties for near-alpha titanium alloys. By annealing a forged Ti60 alloy pancake at 1030 and 1040 degrees C in the alpha+beta two-phase field, two homogeneous bimodal microstructures were obtained, the intensity of secondary alpha in the (0001) pole figure increasing with the annealing temperature. In this study, the influence of annealing temperature on the crystallographic orientation evolution in the pancake was studied using an electron backscattered diffraction analysis method. In particular, a misorientation angle theta associated with (beta Delta J beta(BOR)) that could quantitatively evaluate the deviation of the orientation relationship (OR) between alpha(p) and the surrounding 13 grains from Burgers OR was used to understand the role of the alpha(p) phase, which is considered as an anisotropic precipitate, in the texture evolution during annealing in the two-phase field. It was found that the alpha(p) grains with small theta are more readily preserved during the annealing, while their pinning effect is relatively small, resulting in faster growth of the neighboring 13 grains. A possible effect of heterogeneous local orientation distribution on the microstructure during the annealing process is also discussed. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
description.department[zhao, z. b. ; wang, q. j. ; liu, j. r. ; yang, r.] chinese acad sci, inst met res, shenyang 110016, peoples r china
KeywordTitanium Alloys Texture Phase Boundary Energy Annealing Electron Backscattered Diffraction (Ebsd)
Subject AreaMaterials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/78111
Collection中国科学院金属研究所
Corresponding AuthorWang, QJ (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China.
Recommended Citation
GB/T 7714
Zhao, Z. B.,Wang, Q. J.,Liu, J. R.,et al. Effect of heat treatment on the crystallographic orientation evolution in a near-alpha titanium alloy Ti60[J]. ACTA MATERIALIA,2017,131:305-314.
APA Zhao, Z. B.,Wang, Q. J.,Liu, J. R.,Yang, R.,&Wang, QJ .(2017).Effect of heat treatment on the crystallographic orientation evolution in a near-alpha titanium alloy Ti60.ACTA MATERIALIA,131,305-314.
MLA Zhao, Z. B.,et al."Effect of heat treatment on the crystallographic orientation evolution in a near-alpha titanium alloy Ti60".ACTA MATERIALIA 131(2017):305-314.
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