Solidification and grain refinement in Ti45Al2Mn2Nb1B

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

doi:10.1016/j.intermet.2011.11.003

Solidification and grain refinement in Ti45Al2Mn2Nb1B

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

Metallurgy and Materials

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Abstract

The solidification process of Ti45Al2Mn2Nb1B (Ti4522-1B) was studied together with the baseline alloy Ti45Al2Mn2Nb (Ti4522) through directional solidification. Boron addition at 1 at% was found to have a strong limiting effect on beta dendrite growth, resulting much finer beta dendrites than in the boron-free alloy. Boron addition at that level was also found to have changed the orientation relationship of peritectic alpha with beta dendrites. The peritectic alpha has the Burgers orientation relationship with the beta dendrites in Ti4522 whilst is randomly oriented in Ti4522-1B. The peritectic alpha in Ti4522-1B was likely to be inoculated by boride precipitates at the beta/liquid interfaces. Formation of randomly oriented peritectic alpha during solidification, boride precipitate-induced randomly oriented alpha during beta-to-alpha transformation and fine beta dendrites contribute to grain refinement in Ti4522-1B. (C) 2011 Elsevier Ltd. All rights reserved.

Original language	English
Pages (from-to)	68-76
Number of pages	9
Journal	Intermetallics
Volume	22
DOIs	https://doi.org/10.1016/j.intermet.2011.11.003
Publication status	Published - 1 Mar 2012

Keywords

Phase identification
Crystal growth
Titanium aluminide
Phase transformation
based on TiAl
Microstructure

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10.1016/j.intermet.2011.11.003

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

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title = "Solidification and grain refinement in Ti45Al2Mn2Nb1B",

abstract = "The solidification process of Ti45Al2Mn2Nb1B (Ti4522-1B) was studied together with the baseline alloy Ti45Al2Mn2Nb (Ti4522) through directional solidification. Boron addition at 1 at% was found to have a strong limiting effect on beta dendrite growth, resulting much finer beta dendrites than in the boron-free alloy. Boron addition at that level was also found to have changed the orientation relationship of peritectic alpha with beta dendrites. The peritectic alpha has the Burgers orientation relationship with the beta dendrites in Ti4522 whilst is randomly oriented in Ti4522-1B. The peritectic alpha in Ti4522-1B was likely to be inoculated by boride precipitates at the beta/liquid interfaces. Formation of randomly oriented peritectic alpha during solidification, boride precipitate-induced randomly oriented alpha during beta-to-alpha transformation and fine beta dendrites contribute to grain refinement in Ti4522-1B. (C) 2011 Elsevier Ltd. All rights reserved.",

keywords = "Phase identification, Crystal growth, Titanium aluminide, Phase transformation, based on TiAl, 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.2011.11.003",

language = "English",

volume = "22",

pages = "68--76",

journal = "Intermetallics",

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TY - JOUR

T1 - Solidification and grain refinement in Ti45Al2Mn2Nb1B

AU - Hu, Dawei

AU - Yang, C

AU - Huang, A

AU - Dixon, M

AU - Hecht, U

PY - 2012/3/1

Y1 - 2012/3/1

N2 - The solidification process of Ti45Al2Mn2Nb1B (Ti4522-1B) was studied together with the baseline alloy Ti45Al2Mn2Nb (Ti4522) through directional solidification. Boron addition at 1 at% was found to have a strong limiting effect on beta dendrite growth, resulting much finer beta dendrites than in the boron-free alloy. Boron addition at that level was also found to have changed the orientation relationship of peritectic alpha with beta dendrites. The peritectic alpha has the Burgers orientation relationship with the beta dendrites in Ti4522 whilst is randomly oriented in Ti4522-1B. The peritectic alpha in Ti4522-1B was likely to be inoculated by boride precipitates at the beta/liquid interfaces. Formation of randomly oriented peritectic alpha during solidification, boride precipitate-induced randomly oriented alpha during beta-to-alpha transformation and fine beta dendrites contribute to grain refinement in Ti4522-1B. (C) 2011 Elsevier Ltd. All rights reserved.

AB - The solidification process of Ti45Al2Mn2Nb1B (Ti4522-1B) was studied together with the baseline alloy Ti45Al2Mn2Nb (Ti4522) through directional solidification. Boron addition at 1 at% was found to have a strong limiting effect on beta dendrite growth, resulting much finer beta dendrites than in the boron-free alloy. Boron addition at that level was also found to have changed the orientation relationship of peritectic alpha with beta dendrites. The peritectic alpha has the Burgers orientation relationship with the beta dendrites in Ti4522 whilst is randomly oriented in Ti4522-1B. The peritectic alpha in Ti4522-1B was likely to be inoculated by boride precipitates at the beta/liquid interfaces. Formation of randomly oriented peritectic alpha during solidification, boride precipitate-induced randomly oriented alpha during beta-to-alpha transformation and fine beta dendrites contribute to grain refinement in Ti4522-1B. (C) 2011 Elsevier Ltd. All rights reserved.

KW - Phase identification

KW - Crystal growth

KW - Titanium aluminide

KW - Phase transformation

KW - based on TiAl

KW - Microstructure

U2 - 10.1016/j.intermet.2011.11.003

DO - 10.1016/j.intermet.2011.11.003

M3 - Article

VL - 22

SP - 68

EP - 76

JO - Intermetallics

JF - Intermetallics

ER -

Solidification and grain refinement in Ti45Al2Mn2Nb1B

Abstract

Keywords

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Structural Metallic Systems For Advanced Gas Turbine Applications

Cite this