Grain refinement in beta-solidifying Ti44Al8Nb1B

D. Hu; C. Yang; A. Huang; M. Dixon; U. Hecht

doi:10.1016/j.intermet.2011.12.022

Grain refinement in beta-solidifying Ti44Al8Nb1B

D. Hu, C. Yang, A. Huang, M. Dixon, U. Hecht

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

64 Citations (Scopus)

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 <1120> _α2//[010] _B27 and (0001) _α2//(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} _β, (010) _TiB//{111} _β and (100) _TiB//{211} _β.

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 - Apr 2012
Externally published	Yes

Keywords

A. Titanium aluminides, based on TiAl
B. Phase identification
B. Phase transformation
C. Crystal growth
D. Microstructure

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10.1016/j.intermet.2011.12.022

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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 <1120> α2//[010] B27 and (0001) α2//(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} β, (010) TiB//{111} β and (100) TiB//{211} β.",

keywords = "A. Titanium aluminides, based on TiAl, B. Phase identification, B. Phase transformation, C. Crystal growth, D. Microstructure",

author = "D. 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",

issn = "0966-9795",

publisher = "Elsevier",

}

TY - JOUR

T1 - Grain refinement in beta-solidifying Ti44Al8Nb1B

AU - Hu, D.

AU - Yang, C.

AU - Huang, A.

AU - Dixon, M.

AU - Hecht, U.

PY - 2012/4

Y1 - 2012/4

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 <1120> α2//[010] B27 and (0001) α2//(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} β, (010) TiB//{111} β and (100) TiB//{211} β.

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 <1120> α2//[010] B27 and (0001) α2//(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} β, (010) TiB//{111} β and (100) TiB//{211} β.

KW - A. Titanium aluminides, based on TiAl

KW - B. Phase identification

KW - B. Phase transformation

KW - C. Crystal growth

KW - D. Microstructure

UR - http://www.scopus.com/inward/record.url?scp=84862778019&partnerID=8YFLogxK

U2 - 10.1016/j.intermet.2011.12.022

DO - 10.1016/j.intermet.2011.12.022

M3 - Article

AN - SCOPUS:84862778019

VL - 23

SP - 49

EP - 56

JO - Intermetallics

JF - Intermetallics

SN - 0966-9795

ER -

Grain refinement in beta-solidifying Ti44Al8Nb1B

Abstract

Keywords

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