Grain refinement in beta-solidifying Ti44Al8Nb1B

Dawei Hu; C Yang; A Huang; M Dixon; U Hecht

doi:10.1016/j.intermet.2011.12.022

Grain refinement in beta-solidifying Ti44Al8Nb1B

Dawei Hu, C Yang, A Huang, M Dixon, U Hecht

Metallurgy and Materials

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Abstract

Grain refinement in Ti44Al8Nb1B was studied using directional solidification technique and SEM EBSD analysis. Grain refinement occurred during beta-to-alpha transformation through boride assisted alpha nucleation mechanism rather than during solidification. Burgers and non-Burgers alpha2 grain coexisted and they were inoculated by boride precipitates. The orientation relationship between alpha and the B27 TiB precipitates is 0>(alpha 2)//[010](B27) and (0001)(alpha 2)//(001)(B27). The Burgers alpha variants were inoculated by the boride precipitates having an OR with beta phase and the OR was deduced as (001)(TiB)//{110)(beta), (010)(TiB)//{111)(beta) and (100)(TiB)//{211}(beta). (C) 2012 Elsevier Ltd. All rights reserved.

Original language	English
Pages (from-to)	49-56
Number of pages	8
Journal	Intermetallics
Volume	23
DOIs	https://doi.org/10.1016/j.intermet.2011.12.022
Publication status	Published - 1 Apr 2012

Keywords

Titanium aluminides, based on TiAl
Phase identification
Crystal growth
Phase transformation
Microstructure

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10.1016/j.intermet.2011.12.022

Structural Metallic Systems For Advanced Gas Turbine Applications
Bowen, P., Chiu, Y. & Reed, R.
Engineering & Physical Science Research Council
1/10/09 → 30/09/14
Project: Research Councils

Cite this

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title = "Grain refinement in beta-solidifying Ti44Al8Nb1B",

abstract = "Grain refinement in Ti44Al8Nb1B was studied using directional solidification technique and SEM EBSD analysis. Grain refinement occurred during beta-to-alpha transformation through boride assisted alpha nucleation mechanism rather than during solidification. Burgers and non-Burgers alpha2 grain coexisted and they were inoculated by boride precipitates. The orientation relationship between alpha and the B27 TiB precipitates is 0>(alpha 2)//[010](B27) and (0001)(alpha 2)//(001)(B27). The Burgers alpha variants were inoculated by the boride precipitates having an OR with beta phase and the OR was deduced as (001)(TiB)//{110)(beta), (010)(TiB)//{111)(beta) and (100)(TiB)//{211}(beta). (C) 2012 Elsevier Ltd. All rights reserved.",

keywords = "Titanium aluminides, based on TiAl, Phase identification, Crystal growth, Phase transformation, Microstructure",

author = "Dawei Hu and C Yang and A Huang and M Dixon and U Hecht",

year = "2012",

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doi = "10.1016/j.intermet.2011.12.022",

language = "English",

volume = "23",

pages = "49--56",

journal = "Intermetallics",

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TY - JOUR

T1 - Grain refinement in beta-solidifying Ti44Al8Nb1B

AU - Hu, Dawei

AU - Yang, C

AU - Huang, A

AU - Dixon, M

AU - Hecht, U

PY - 2012/4/1

Y1 - 2012/4/1

N2 - Grain refinement in Ti44Al8Nb1B was studied using directional solidification technique and SEM EBSD analysis. Grain refinement occurred during beta-to-alpha transformation through boride assisted alpha nucleation mechanism rather than during solidification. Burgers and non-Burgers alpha2 grain coexisted and they were inoculated by boride precipitates. The orientation relationship between alpha and the B27 TiB precipitates is 0>(alpha 2)//[010](B27) and (0001)(alpha 2)//(001)(B27). The Burgers alpha variants were inoculated by the boride precipitates having an OR with beta phase and the OR was deduced as (001)(TiB)//{110)(beta), (010)(TiB)//{111)(beta) and (100)(TiB)//{211}(beta). (C) 2012 Elsevier Ltd. All rights reserved.

AB - Grain refinement in Ti44Al8Nb1B was studied using directional solidification technique and SEM EBSD analysis. Grain refinement occurred during beta-to-alpha transformation through boride assisted alpha nucleation mechanism rather than during solidification. Burgers and non-Burgers alpha2 grain coexisted and they were inoculated by boride precipitates. The orientation relationship between alpha and the B27 TiB precipitates is 0>(alpha 2)//[010](B27) and (0001)(alpha 2)//(001)(B27). The Burgers alpha variants were inoculated by the boride precipitates having an OR with beta phase and the OR was deduced as (001)(TiB)//{110)(beta), (010)(TiB)//{111)(beta) and (100)(TiB)//{211}(beta). (C) 2012 Elsevier Ltd. All rights reserved.

KW - Titanium aluminides, based on TiAl

KW - Phase identification

KW - Crystal growth

KW - Phase transformation

KW - Microstructure

U2 - 10.1016/j.intermet.2011.12.022

DO - 10.1016/j.intermet.2011.12.022

M3 - Article

VL - 23

SP - 49

EP - 56

JO - Intermetallics

JF - Intermetallics

ER -

Grain refinement in beta-solidifying Ti44Al8Nb1B

Abstract

Keywords

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Structural Metallic Systems For Advanced Gas Turbine Applications

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