The solidification path related columnar-to-equiaxed transition in Ti-Al alloys

Hong Zhong; Shuangming Li; Hongchao Kou; Jinshan Li

doi:10.1016/j.intermet.2014.12.014

The solidification path related columnar-to-equiaxed transition in Ti-Al alloys

Hong Zhong, Shuangming Li, Hongchao Kou, Jinshan Li

School of Materials Sience and Engineering

Northwestern Polytechnical University Xian

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

19 Scopus citations

Abstract

Columnar-to-Equiaxed Transition (CET) of binary Ti-Al alloys and multi-component Ti-48Al-2Cr-2Nb alloys is studied using Bridgman solidification technique. The effect of aluminum concentration and growth rate on CET is determined. It is found in Ti-46Al and Ti-50Al alloy ingots equiaxed grains develop ahead of the moving solid-liquid interface with a growth rate of 500 μm/s; microstructures in Ti-49Al alloy stay columnar dendrites with the same growth rate. CET in Ti-Al alloys are not only influenced by growth rate, but also by the solidification path that is related to alloying composition. CET in Ti-Al alloys is predicted using the dendritic growth model based on the criterion of growth at marginal stability. According to the calculated results and directionally solidified microstructures, values of the nucleation undercooling for α and β phases are given. The growth rates to avoid CET in Ti-48Al-2Cr-2Nb alloy are suggested.

Original language	English
Pages (from-to)	81-86
Number of pages	6
Journal	Intermetallics
Volume	59
DOIs	https://doi.org/10.1016/j.intermet.2014.12.014
State	Published - Apr 2015

Keywords

A. Intermetallics
B. Nucleation and growth
C. Casting
D. Microstructure

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10.1016/j.intermet.2014.12.014

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title = "The solidification path related columnar-to-equiaxed transition in Ti-Al alloys",

abstract = "Columnar-to-Equiaxed Transition (CET) of binary Ti-Al alloys and multi-component Ti-48Al-2Cr-2Nb alloys is studied using Bridgman solidification technique. The effect of aluminum concentration and growth rate on CET is determined. It is found in Ti-46Al and Ti-50Al alloy ingots equiaxed grains develop ahead of the moving solid-liquid interface with a growth rate of 500 μm/s; microstructures in Ti-49Al alloy stay columnar dendrites with the same growth rate. CET in Ti-Al alloys are not only influenced by growth rate, but also by the solidification path that is related to alloying composition. CET in Ti-Al alloys is predicted using the dendritic growth model based on the criterion of growth at marginal stability. According to the calculated results and directionally solidified microstructures, values of the nucleation undercooling for α and β phases are given. The growth rates to avoid CET in Ti-48Al-2Cr-2Nb alloy are suggested.",

keywords = "A. Intermetallics, B. Nucleation and growth, C. Casting, D. Microstructure",

author = "Hong Zhong and Shuangming Li and Hongchao Kou and Jinshan Li",

year = "2015",

month = apr,

doi = "10.1016/j.intermet.2014.12.014",

language = "英语",

volume = "59",

pages = "81--86",

journal = "Intermetallics",

issn = "0966-9795",

publisher = "Elsevier Ltd",

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T1 - The solidification path related columnar-to-equiaxed transition in Ti-Al alloys

AU - Zhong, Hong

AU - Li, Shuangming

AU - Kou, Hongchao

AU - Li, Jinshan

PY - 2015/4

Y1 - 2015/4

N2 - Columnar-to-Equiaxed Transition (CET) of binary Ti-Al alloys and multi-component Ti-48Al-2Cr-2Nb alloys is studied using Bridgman solidification technique. The effect of aluminum concentration and growth rate on CET is determined. It is found in Ti-46Al and Ti-50Al alloy ingots equiaxed grains develop ahead of the moving solid-liquid interface with a growth rate of 500 μm/s; microstructures in Ti-49Al alloy stay columnar dendrites with the same growth rate. CET in Ti-Al alloys are not only influenced by growth rate, but also by the solidification path that is related to alloying composition. CET in Ti-Al alloys is predicted using the dendritic growth model based on the criterion of growth at marginal stability. According to the calculated results and directionally solidified microstructures, values of the nucleation undercooling for α and β phases are given. The growth rates to avoid CET in Ti-48Al-2Cr-2Nb alloy are suggested.

AB - Columnar-to-Equiaxed Transition (CET) of binary Ti-Al alloys and multi-component Ti-48Al-2Cr-2Nb alloys is studied using Bridgman solidification technique. The effect of aluminum concentration and growth rate on CET is determined. It is found in Ti-46Al and Ti-50Al alloy ingots equiaxed grains develop ahead of the moving solid-liquid interface with a growth rate of 500 μm/s; microstructures in Ti-49Al alloy stay columnar dendrites with the same growth rate. CET in Ti-Al alloys are not only influenced by growth rate, but also by the solidification path that is related to alloying composition. CET in Ti-Al alloys is predicted using the dendritic growth model based on the criterion of growth at marginal stability. According to the calculated results and directionally solidified microstructures, values of the nucleation undercooling for α and β phases are given. The growth rates to avoid CET in Ti-48Al-2Cr-2Nb alloy are suggested.

KW - A. Intermetallics

KW - B. Nucleation and growth

KW - C. Casting

KW - D. Microstructure

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U2 - 10.1016/j.intermet.2014.12.014

DO - 10.1016/j.intermet.2014.12.014

M3 - 文章

AN - SCOPUS:84921417588

SN - 0966-9795

VL - 59

SP - 81

EP - 86

JO - Intermetallics

JF - Intermetallics

ER -

The solidification path related columnar-to-equiaxed transition in Ti-Al alloys

Abstract

Keywords

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