Microstructure control of Ti-45Al-8.5Nb-(W, B, Y) alloy during the solidification process

Guang Yang; Hongchao Kou; Jieren Yang; Jinshan Li; Hengzhi Fu

doi:10.1016/j.actamat.2016.04.021

Microstructure control of Ti-45Al-8.5Nb-(W, B, Y) alloy during the solidification process

Guang Yang, Hongchao Kou, Jieren Yang, Jinshan Li, Hengzhi Fu

School of Materials Sience and Engineering

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

73 Scopus citations

Abstract

In this work, a two-step isothermal treatment (TIT) during the solidification process is proposed to eliminate micro-segregation and reduce the cracking tendency of Ti-45Al-8.5Nb-0.2W-0.2B-0.02Y (at.%) alloy. The TIT consists of a short-term isothermal treatment in the single β phase region (1st IT) and a second isothermal treatment slightly above the β + α transus temperature (2nd IT). The results show that solidification without the isothermal treatment (NIT) produces non-uniform microstructures due to Al-segregation, whereas microstructure homogeneity is improved after the 1st IT due to the elimination of the peritectic α phase. The TIT can yield fine and uniform lamellar structures without micro-segregation, as well as reduced textures. Moreover, it is also found that the TIT can reduce the cracking tendency of TiAl alloys with high contents of Nb.

Original language	English
Pages (from-to)	121-131
Number of pages	11
Journal	Acta Materialia
Volume	112
DOIs	https://doi.org/10.1016/j.actamat.2016.04.021
State	Published - 15 Jun 2016

Keywords

Electron backscattering diffraction
Homogeneity
Intermetallics
Microsegregation
Solidification microstructure

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10.1016/j.actamat.2016.04.021

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title = "Microstructure control of Ti-45Al-8.5Nb-(W, B, Y) alloy during the solidification process",

abstract = "In this work, a two-step isothermal treatment (TIT) during the solidification process is proposed to eliminate micro-segregation and reduce the cracking tendency of Ti-45Al-8.5Nb-0.2W-0.2B-0.02Y (at.%) alloy. The TIT consists of a short-term isothermal treatment in the single β phase region (1st IT) and a second isothermal treatment slightly above the β + α transus temperature (2nd IT). The results show that solidification without the isothermal treatment (NIT) produces non-uniform microstructures due to Al-segregation, whereas microstructure homogeneity is improved after the 1st IT due to the elimination of the peritectic α phase. The TIT can yield fine and uniform lamellar structures without micro-segregation, as well as reduced textures. Moreover, it is also found that the TIT can reduce the cracking tendency of TiAl alloys with high contents of Nb.",

keywords = "Electron backscattering diffraction, Homogeneity, Intermetallics, Microsegregation, Solidification microstructure",

author = "Guang Yang and Hongchao Kou and Jieren Yang and Jinshan Li and Hengzhi Fu",

note = "Publisher Copyright: {\textcopyright} 2016 Acta Materialia Inc.",

year = "2016",

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day = "15",

doi = "10.1016/j.actamat.2016.04.021",

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T1 - Microstructure control of Ti-45Al-8.5Nb-(W, B, Y) alloy during the solidification process

AU - Yang, Guang

AU - Kou, Hongchao

AU - Yang, Jieren

AU - Li, Jinshan

AU - Fu, Hengzhi

PY - 2016/6/15

Y1 - 2016/6/15

N2 - In this work, a two-step isothermal treatment (TIT) during the solidification process is proposed to eliminate micro-segregation and reduce the cracking tendency of Ti-45Al-8.5Nb-0.2W-0.2B-0.02Y (at.%) alloy. The TIT consists of a short-term isothermal treatment in the single β phase region (1st IT) and a second isothermal treatment slightly above the β + α transus temperature (2nd IT). The results show that solidification without the isothermal treatment (NIT) produces non-uniform microstructures due to Al-segregation, whereas microstructure homogeneity is improved after the 1st IT due to the elimination of the peritectic α phase. The TIT can yield fine and uniform lamellar structures without micro-segregation, as well as reduced textures. Moreover, it is also found that the TIT can reduce the cracking tendency of TiAl alloys with high contents of Nb.

AB - In this work, a two-step isothermal treatment (TIT) during the solidification process is proposed to eliminate micro-segregation and reduce the cracking tendency of Ti-45Al-8.5Nb-0.2W-0.2B-0.02Y (at.%) alloy. The TIT consists of a short-term isothermal treatment in the single β phase region (1st IT) and a second isothermal treatment slightly above the β + α transus temperature (2nd IT). The results show that solidification without the isothermal treatment (NIT) produces non-uniform microstructures due to Al-segregation, whereas microstructure homogeneity is improved after the 1st IT due to the elimination of the peritectic α phase. The TIT can yield fine and uniform lamellar structures without micro-segregation, as well as reduced textures. Moreover, it is also found that the TIT can reduce the cracking tendency of TiAl alloys with high contents of Nb.

KW - Electron backscattering diffraction

KW - Homogeneity

KW - Intermetallics

KW - Microsegregation

KW - Solidification microstructure

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U2 - 10.1016/j.actamat.2016.04.021

DO - 10.1016/j.actamat.2016.04.021

M3 - 文章

AN - SCOPUS:84964407341

SN - 1359-6454

VL - 112

SP - 121

EP - 131

JO - Acta Materialia

JF - Acta Materialia

ER -

Microstructure control of Ti-45Al-8.5Nb-(W, B, Y) alloy during the solidification process

Abstract

Keywords

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