A β-solidifying TiAl alloy reinforced with ultra-fine Y-rich precipitates

Xu Gu; Sida Jiang; Fuyang Cao; Guoqing Zhang; Dongye Yang; Shu Guo; Heqian Song; Jianfei Sun

doi:10.1016/j.scriptamat.2020.10.010

A β-solidifying TiAl alloy reinforced with ultra-fine Y-rich precipitates

Xu Gu
, Sida Jiang^*
, Fuyang Cao
, Guoqing Zhang
, Dongye Yang
, Shu Guo
, Heqian Song
, Jianfei Sun

^*Corresponding author for this work

School of Materials Science and Engineering

Harbin Institute of Technology
Beijing Institute of Aeronautical Materials
Shanghai University of Engineering Science

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

59 Scopus citations

Abstract

A β-solidifying TiAl alloy with a refined microstructure and ultra-fine yttrium-rich precipitates that was consolidated by spark plasma sintering was investigated by scanning and transmission electron microscopies. Two categories of yttrium-rich precipitates, Y₂O₃ and YAl₂, with sizes ranging from tens to hundreds of nanometers were found to be dispersed within the matrix uniformly. The crystallographic relationship between the two precipitates and the γ-TiAl matrix was determined by the selected area electron diffraction and high-resolution transmission electron microscopy. This spark plasma sintered TiAl alloy was characterized by a uniform duplex microstructure, and it exhibited excellent tensile properties at room temperature. Typically, specimen sintered at 1150°C has an ultimate tensile strength of 1113.1 MPa, yield strength of 881MPa, and a moderate plastic elongation of 1.41%.

Original language	English
Pages (from-to)	55-60
Number of pages	6
Journal	Scripta Materialia
Volume	192
DOIs	https://doi.org/10.1016/j.scriptamat.2020.10.010
State	Published - Feb 2021

Keywords

Mechanical properties
Precipitates
TiAl
Transmission electron microscopy
orientation relationship

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10.1016/j.scriptamat.2020.10.010

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title = "A β-solidifying TiAl alloy reinforced with ultra-fine Y-rich precipitates",

abstract = "A β-solidifying TiAl alloy with a refined microstructure and ultra-fine yttrium-rich precipitates that was consolidated by spark plasma sintering was investigated by scanning and transmission electron microscopies. Two categories of yttrium-rich precipitates, Y2O3 and YAl2, with sizes ranging from tens to hundreds of nanometers were found to be dispersed within the matrix uniformly. The crystallographic relationship between the two precipitates and the γ-TiAl matrix was determined by the selected area electron diffraction and high-resolution transmission electron microscopy. This spark plasma sintered TiAl alloy was characterized by a uniform duplex microstructure, and it exhibited excellent tensile properties at room temperature. Typically, specimen sintered at 1150°C has an ultimate tensile strength of 1113.1 MPa, yield strength of 881MPa, and a moderate plastic elongation of 1.41\%.",

keywords = "Mechanical properties, Precipitates, TiAl, Transmission electron microscopy, orientation relationship",

author = "Xu Gu and Sida Jiang and Fuyang Cao and Guoqing Zhang and Dongye Yang and Shu Guo and Heqian Song and Jianfei Sun",

note = "Publisher Copyright: {\textcopyright} 2020",

year = "2021",

month = feb,

doi = "10.1016/j.scriptamat.2020.10.010",

language = "英语",

volume = "192",

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TY - JOUR

T1 - A β-solidifying TiAl alloy reinforced with ultra-fine Y-rich precipitates

AU - Gu, Xu

AU - Jiang, Sida

AU - Cao, Fuyang

AU - Zhang, Guoqing

AU - Yang, Dongye

AU - Guo, Shu

AU - Song, Heqian

AU - Sun, Jianfei

PY - 2021/2

Y1 - 2021/2

N2 - A β-solidifying TiAl alloy with a refined microstructure and ultra-fine yttrium-rich precipitates that was consolidated by spark plasma sintering was investigated by scanning and transmission electron microscopies. Two categories of yttrium-rich precipitates, Y2O3 and YAl2, with sizes ranging from tens to hundreds of nanometers were found to be dispersed within the matrix uniformly. The crystallographic relationship between the two precipitates and the γ-TiAl matrix was determined by the selected area electron diffraction and high-resolution transmission electron microscopy. This spark plasma sintered TiAl alloy was characterized by a uniform duplex microstructure, and it exhibited excellent tensile properties at room temperature. Typically, specimen sintered at 1150°C has an ultimate tensile strength of 1113.1 MPa, yield strength of 881MPa, and a moderate plastic elongation of 1.41%.

AB - A β-solidifying TiAl alloy with a refined microstructure and ultra-fine yttrium-rich precipitates that was consolidated by spark plasma sintering was investigated by scanning and transmission electron microscopies. Two categories of yttrium-rich precipitates, Y2O3 and YAl2, with sizes ranging from tens to hundreds of nanometers were found to be dispersed within the matrix uniformly. The crystallographic relationship between the two precipitates and the γ-TiAl matrix was determined by the selected area electron diffraction and high-resolution transmission electron microscopy. This spark plasma sintered TiAl alloy was characterized by a uniform duplex microstructure, and it exhibited excellent tensile properties at room temperature. Typically, specimen sintered at 1150°C has an ultimate tensile strength of 1113.1 MPa, yield strength of 881MPa, and a moderate plastic elongation of 1.41%.

KW - Mechanical properties

KW - Precipitates

KW - TiAl

KW - Transmission electron microscopy

KW - orientation relationship

UR - https://www.scopus.com/pages/publications/85092515646

U2 - 10.1016/j.scriptamat.2020.10.010

DO - 10.1016/j.scriptamat.2020.10.010

M3 - 文章

AN - SCOPUS:85092515646

SN - 1359-6462

VL - 192

SP - 55

EP - 60

JO - Scripta Materialia

JF - Scripta Materialia

ER -

A β-solidifying TiAl alloy reinforced with ultra-fine Y-rich precipitates

Abstract

Keywords

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