Widmannstätten laths in Ti48Al2Cr2Nb alloy by undercooled solidification

Yi Liu; Rui Hu; Guang Yang; Hongchao Kou; Tiebang Zhang; Jun Wang; Jinshan Li

doi:10.1016/j.matchar.2015.07.006

Widmannstätten laths in Ti48Al2Cr2Nb alloy by undercooled solidification

Yi Liu, Rui Hu, Guang Yang, Hongchao Kou, Tiebang Zhang, Jun Wang, Jinshan Li

School of Materials Sience and Engineering

Northwestern Polytechnical University Xian

Research output: Contribution to journal › Article › peer-review

20 Scopus citations

Abstract

Widmannstätten laths in Ti48Al2Cr2Nb alloy were obtained by containerless electromagnetic levitation during undercooled solidification rather than heat treatments in most cases. The nucleation of γ_{Widmannstätten} is confirmed by the thermal history of the second recalescence behaviour. High dislocation density, stacking faults and dislocation slip are observed by transmission electron microscopy. By quantitative analysis of the transformation energy, the driving force for γ_{Widmannstätten} in the solid state phase transformation is calculated, compared with that of heat treatments. Meanwhile, the proper undercoolings (ΔT = 257-300 K), post-solidification cooling rates (11.1-29.1 K/s), the fine lamellar colony sizes (306-467 μm) and proper undercoolings in the solid state phase transformation are in favour of promoting the formation of Widmannstätten laths at moderate undercoolings.

Original language	English
Pages (from-to)	156-160
Number of pages	5
Journal	Materials Characterization
Volume	107
DOIs	https://doi.org/10.1016/j.matchar.2015.07.006
State	Published - 17 Jul 2015

Keywords

Lamellar colony size
Recalescence behaviour
Undercooled solidification
Widmannstätten laths

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@article{329650a2e2574f9a971425ac0c566e93,

title = "Widmannst{\"a}tten laths in Ti48Al2Cr2Nb alloy by undercooled solidification",

abstract = "Widmannst{\"a}tten laths in Ti48Al2Cr2Nb alloy were obtained by containerless electromagnetic levitation during undercooled solidification rather than heat treatments in most cases. The nucleation of γWidmannst{\"a}tten is confirmed by the thermal history of the second recalescence behaviour. High dislocation density, stacking faults and dislocation slip are observed by transmission electron microscopy. By quantitative analysis of the transformation energy, the driving force for γWidmannst{\"a}tten in the solid state phase transformation is calculated, compared with that of heat treatments. Meanwhile, the proper undercoolings (ΔT = 257-300 K), post-solidification cooling rates (11.1-29.1 K/s), the fine lamellar colony sizes (306-467 μm) and proper undercoolings in the solid state phase transformation are in favour of promoting the formation of Widmannst{\"a}tten laths at moderate undercoolings.",

keywords = "Lamellar colony size, Recalescence behaviour, Undercooled solidification, Widmannst{\"a}tten laths",

author = "Yi Liu and Rui Hu and Guang Yang and Hongchao Kou and Tiebang Zhang and Jun Wang and Jinshan Li",

year = "2015",

month = jul,

day = "17",

doi = "10.1016/j.matchar.2015.07.006",

language = "英语",

volume = "107",

pages = "156--160",

journal = "Materials Characterization",

issn = "1044-5803",

publisher = "Elsevier Inc.",

}

TY - JOUR

T1 - Widmannstätten laths in Ti48Al2Cr2Nb alloy by undercooled solidification

AU - Liu, Yi

AU - Hu, Rui

AU - Yang, Guang

AU - Kou, Hongchao

AU - Zhang, Tiebang

AU - Wang, Jun

AU - Li, Jinshan

PY - 2015/7/17

Y1 - 2015/7/17

N2 - Widmannstätten laths in Ti48Al2Cr2Nb alloy were obtained by containerless electromagnetic levitation during undercooled solidification rather than heat treatments in most cases. The nucleation of γWidmannstätten is confirmed by the thermal history of the second recalescence behaviour. High dislocation density, stacking faults and dislocation slip are observed by transmission electron microscopy. By quantitative analysis of the transformation energy, the driving force for γWidmannstätten in the solid state phase transformation is calculated, compared with that of heat treatments. Meanwhile, the proper undercoolings (ΔT = 257-300 K), post-solidification cooling rates (11.1-29.1 K/s), the fine lamellar colony sizes (306-467 μm) and proper undercoolings in the solid state phase transformation are in favour of promoting the formation of Widmannstätten laths at moderate undercoolings.

AB - Widmannstätten laths in Ti48Al2Cr2Nb alloy were obtained by containerless electromagnetic levitation during undercooled solidification rather than heat treatments in most cases. The nucleation of γWidmannstätten is confirmed by the thermal history of the second recalescence behaviour. High dislocation density, stacking faults and dislocation slip are observed by transmission electron microscopy. By quantitative analysis of the transformation energy, the driving force for γWidmannstätten in the solid state phase transformation is calculated, compared with that of heat treatments. Meanwhile, the proper undercoolings (ΔT = 257-300 K), post-solidification cooling rates (11.1-29.1 K/s), the fine lamellar colony sizes (306-467 μm) and proper undercoolings in the solid state phase transformation are in favour of promoting the formation of Widmannstätten laths at moderate undercoolings.

KW - Lamellar colony size

KW - Recalescence behaviour

KW - Undercooled solidification

KW - Widmannstätten laths

UR - http://www.scopus.com/inward/record.url?scp=84937037084&partnerID=8YFLogxK

U2 - 10.1016/j.matchar.2015.07.006

DO - 10.1016/j.matchar.2015.07.006

M3 - 文章

AN - SCOPUS:84937037084

SN - 1044-5803

VL - 107

SP - 156

EP - 160

JO - Materials Characterization

JF - Materials Characterization

ER -

Widmannstätten laths in Ti48Al2Cr2Nb alloy by undercooled solidification

Abstract

Keywords

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