Effect of growth rate and diameter on microstructure and hardness of directionally solidified Ti-46Al-8Nb alloy

Guo Huai Liu; Xin Zhong Li; Yuan Zhang; Rui Run Chen; Yan Qing Su; Jing Jie Guo; Heng Zhi Fu; Zhao Dong Wang; Guo Dong Wang

doi:10.1016/S1003-6326(14)63567-6

Effect of growth rate and diameter on microstructure and hardness of directionally solidified Ti-46Al-8Nb alloy

Guo Huai Liu^*
, Xin Zhong Li
, Yuan Zhang
, Rui Run Chen
, Yan Qing Su
, Jing Jie Guo
, Heng Zhi Fu
, Zhao Dong Wang
, Guo Dong Wang

^*Corresponding author for this work

Northeastern University China
Harbin Institute of Technology

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

8 Scopus citations

Abstract

Bridgman-type directional solidification experiments were conducted for Ti-46Al-8Nb (mole fraction, %) alloy. The effects of the growth rate and the diameter on the microstructure, phase transition and hardness of the alloy were investigated. The results show that with the increase of the growth rate and the decrease of the diameter, the fully β phase solidification changes to the peritectic solidification, and the final microstructure is composed of the α₂/γ lamellar structure and a multiphase microstructure (B2 phase, α₂/γ lamellar structure) respectively, which can be attributed to the solute enrichment resulting from the decreasing diffusion and convection ability. The occurrence of peritectic reaction at high growth rate promotes the solute segregation heavily and the coarse lamellar spacing in Al- and Nb-rich region, which greatly decreases the hardness values and leads to the discontinuity of the hardness curves with the increase of the growth rate. Comparatively, the Ti-46Al-8Nb alloy has lower hardness values than the other applied TiAl-based alloys in previous studies.

Original language	English
Pages (from-to)	4044-4052
Number of pages	9
Journal	Transactions of Nonferrous Metals Society of China (English Edition)
Volume	24
Issue number	12
DOIs	https://doi.org/10.1016/S1003-6326(14)63567-6
State	Published - 1 Dec 2014
Externally published	Yes

Keywords

TiAl alloy
diameter
directional solidification
growth rate
phase transition

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10.1016/S1003-6326(14)63567-6

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title = "Effect of growth rate and diameter on microstructure and hardness of directionally solidified Ti-46Al-8Nb alloy",

abstract = "Bridgman-type directional solidification experiments were conducted for Ti-46Al-8Nb (mole fraction, \%) alloy. The effects of the growth rate and the diameter on the microstructure, phase transition and hardness of the alloy were investigated. The results show that with the increase of the growth rate and the decrease of the diameter, the fully β phase solidification changes to the peritectic solidification, and the final microstructure is composed of the α2/γ lamellar structure and a multiphase microstructure (B2 phase, α2/γ lamellar structure) respectively, which can be attributed to the solute enrichment resulting from the decreasing diffusion and convection ability. The occurrence of peritectic reaction at high growth rate promotes the solute segregation heavily and the coarse lamellar spacing in Al- and Nb-rich region, which greatly decreases the hardness values and leads to the discontinuity of the hardness curves with the increase of the growth rate. Comparatively, the Ti-46Al-8Nb alloy has lower hardness values than the other applied TiAl-based alloys in previous studies.",

keywords = "TiAl alloy, diameter, directional solidification, growth rate, phase transition",

author = "Liu, \{Guo Huai\} and Li, \{Xin Zhong\} and Yuan Zhang and Chen, \{Rui Run\} and Su, \{Yan Qing\} and Guo, \{Jing Jie\} and Fu, \{Heng Zhi\} and Wang, \{Zhao Dong\} and Wang, \{Guo Dong\}",

note = "Publisher Copyright: {\textcopyright} 2014 The Nonferrous Metals Society of China.",

year = "2014",

month = dec,

day = "1",

doi = "10.1016/S1003-6326(14)63567-6",

language = "英语",

volume = "24",

pages = "4044--4052",

journal = "Transactions of Nonferrous Metals Society of China (English Edition)",

issn = "1003-6326",

publisher = "Nonferrous Metals Society of China",

number = "12",

}

TY - JOUR

T1 - Effect of growth rate and diameter on microstructure and hardness of directionally solidified Ti-46Al-8Nb alloy

AU - Liu, Guo Huai

AU - Li, Xin Zhong

AU - Zhang, Yuan

AU - Chen, Rui Run

AU - Su, Yan Qing

AU - Guo, Jing Jie

AU - Fu, Heng Zhi

AU - Wang, Zhao Dong

AU - Wang, Guo Dong

PY - 2014/12/1

Y1 - 2014/12/1

N2 - Bridgman-type directional solidification experiments were conducted for Ti-46Al-8Nb (mole fraction, %) alloy. The effects of the growth rate and the diameter on the microstructure, phase transition and hardness of the alloy were investigated. The results show that with the increase of the growth rate and the decrease of the diameter, the fully β phase solidification changes to the peritectic solidification, and the final microstructure is composed of the α2/γ lamellar structure and a multiphase microstructure (B2 phase, α2/γ lamellar structure) respectively, which can be attributed to the solute enrichment resulting from the decreasing diffusion and convection ability. The occurrence of peritectic reaction at high growth rate promotes the solute segregation heavily and the coarse lamellar spacing in Al- and Nb-rich region, which greatly decreases the hardness values and leads to the discontinuity of the hardness curves with the increase of the growth rate. Comparatively, the Ti-46Al-8Nb alloy has lower hardness values than the other applied TiAl-based alloys in previous studies.

AB - Bridgman-type directional solidification experiments were conducted for Ti-46Al-8Nb (mole fraction, %) alloy. The effects of the growth rate and the diameter on the microstructure, phase transition and hardness of the alloy were investigated. The results show that with the increase of the growth rate and the decrease of the diameter, the fully β phase solidification changes to the peritectic solidification, and the final microstructure is composed of the α2/γ lamellar structure and a multiphase microstructure (B2 phase, α2/γ lamellar structure) respectively, which can be attributed to the solute enrichment resulting from the decreasing diffusion and convection ability. The occurrence of peritectic reaction at high growth rate promotes the solute segregation heavily and the coarse lamellar spacing in Al- and Nb-rich region, which greatly decreases the hardness values and leads to the discontinuity of the hardness curves with the increase of the growth rate. Comparatively, the Ti-46Al-8Nb alloy has lower hardness values than the other applied TiAl-based alloys in previous studies.

KW - TiAl alloy

KW - diameter

KW - directional solidification

KW - growth rate

KW - phase transition

UR - https://www.scopus.com/pages/publications/84927134127

U2 - 10.1016/S1003-6326(14)63567-6

DO - 10.1016/S1003-6326(14)63567-6

M3 - 文章

AN - SCOPUS:84927134127

SN - 1003-6326

VL - 24

SP - 4044

EP - 4052

JO - Transactions of Nonferrous Metals Society of China (English Edition)

JF - Transactions of Nonferrous Metals Society of China (English Edition)

IS - 12

ER -

Effect of growth rate and diameter on microstructure and hardness of directionally solidified Ti-46Al-8Nb alloy

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