Simultaneously achieving high tensile strength and fracture toughness of Ti/Ti-Al multilayered composites

Shaoyuan Lyu; Yanbo Sun; Lei Ren; Wenlong Xiao; Chaoli Ma

doi:10.1016/j.intermet.2017.06.007

Simultaneously achieving high tensile strength and fracture toughness of Ti/Ti-Al multilayered composites

Shaoyuan Lyu
, Yanbo Sun
, Lei Ren
, Wenlong Xiao^*
, Chaoli Ma

^*Corresponding author for this work

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

54 Scopus citations

Abstract

Ti/Ti-Al multilayered composites with different volume fractions of α-Ti layer were fabricated by hot press sintering. Microstructural observation indicates that the phase compositions in all the composites are α-Ti, Ti₃Al, TiAl, TiAl₂ and TiAl₃. The tensile strength and fracture toughness of Ti/Ti-Al multilayered composites are influenced by the volume fraction of α-Ti layer. The composite with 53 vol% Ti presents the highest tensile strength and suitable ductility at room temperature, and its fracture toughness can reach 47.6 MPam, which is much higher than that of TiAl intermetallic alloy and Ti/Al₃Ti composites. Fracture analysis reveals that a certain volume fraction of Ti layers can effectively prevent the crack propagation when the crack is extended to the interface, resulting in high tensile strength and acceptable ductility at the same time. The improvement of toughness is associated with crack deflection and crack bridging provided by the appropriate thickness of remaining α-Ti layer.

Original language	English
Pages (from-to)	16-22
Number of pages	7
Journal	Intermetallics
Volume	90
DOIs	https://doi.org/10.1016/j.intermet.2017.06.007
State	Published - Nov 2017

Keywords

Microstructure
Multilayered composite
Tensile properties
Ti-Al intermetallics
Toughness

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10.1016/j.intermet.2017.06.007

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@article{35189f1fef634f25b7803c6ff3fb2397,

title = "Simultaneously achieving high tensile strength and fracture toughness of Ti/Ti-Al multilayered composites",

abstract = "Ti/Ti-Al multilayered composites with different volume fractions of α-Ti layer were fabricated by hot press sintering. Microstructural observation indicates that the phase compositions in all the composites are α-Ti, Ti3Al, TiAl, TiAl2 and TiAl3. The tensile strength and fracture toughness of Ti/Ti-Al multilayered composites are influenced by the volume fraction of α-Ti layer. The composite with 53 vol\% Ti presents the highest tensile strength and suitable ductility at room temperature, and its fracture toughness can reach 47.6 MPam, which is much higher than that of TiAl intermetallic alloy and Ti/Al3Ti composites. Fracture analysis reveals that a certain volume fraction of Ti layers can effectively prevent the crack propagation when the crack is extended to the interface, resulting in high tensile strength and acceptable ductility at the same time. The improvement of toughness is associated with crack deflection and crack bridging provided by the appropriate thickness of remaining α-Ti layer.",

keywords = "Microstructure, Multilayered composite, Tensile properties, Ti-Al intermetallics, Toughness",

author = "Shaoyuan Lyu and Yanbo Sun and Lei Ren and Wenlong Xiao and Chaoli Ma",

note = "Publisher Copyright: {\textcopyright} 2017",

year = "2017",

month = nov,

doi = "10.1016/j.intermet.2017.06.007",

language = "英语",

volume = "90",

pages = "16--22",

journal = "Intermetallics",

issn = "0966-9795",

publisher = "Elsevier Ltd",

}

TY - JOUR

T1 - Simultaneously achieving high tensile strength and fracture toughness of Ti/Ti-Al multilayered composites

AU - Lyu, Shaoyuan

AU - Sun, Yanbo

AU - Ren, Lei

AU - Xiao, Wenlong

AU - Ma, Chaoli

PY - 2017/11

Y1 - 2017/11

N2 - Ti/Ti-Al multilayered composites with different volume fractions of α-Ti layer were fabricated by hot press sintering. Microstructural observation indicates that the phase compositions in all the composites are α-Ti, Ti3Al, TiAl, TiAl2 and TiAl3. The tensile strength and fracture toughness of Ti/Ti-Al multilayered composites are influenced by the volume fraction of α-Ti layer. The composite with 53 vol% Ti presents the highest tensile strength and suitable ductility at room temperature, and its fracture toughness can reach 47.6 MPam, which is much higher than that of TiAl intermetallic alloy and Ti/Al3Ti composites. Fracture analysis reveals that a certain volume fraction of Ti layers can effectively prevent the crack propagation when the crack is extended to the interface, resulting in high tensile strength and acceptable ductility at the same time. The improvement of toughness is associated with crack deflection and crack bridging provided by the appropriate thickness of remaining α-Ti layer.

AB - Ti/Ti-Al multilayered composites with different volume fractions of α-Ti layer were fabricated by hot press sintering. Microstructural observation indicates that the phase compositions in all the composites are α-Ti, Ti3Al, TiAl, TiAl2 and TiAl3. The tensile strength and fracture toughness of Ti/Ti-Al multilayered composites are influenced by the volume fraction of α-Ti layer. The composite with 53 vol% Ti presents the highest tensile strength and suitable ductility at room temperature, and its fracture toughness can reach 47.6 MPam, which is much higher than that of TiAl intermetallic alloy and Ti/Al3Ti composites. Fracture analysis reveals that a certain volume fraction of Ti layers can effectively prevent the crack propagation when the crack is extended to the interface, resulting in high tensile strength and acceptable ductility at the same time. The improvement of toughness is associated with crack deflection and crack bridging provided by the appropriate thickness of remaining α-Ti layer.

KW - Microstructure

KW - Multilayered composite

KW - Tensile properties

KW - Ti-Al intermetallics

KW - Toughness

UR - https://www.scopus.com/pages/publications/85021178180

U2 - 10.1016/j.intermet.2017.06.007

DO - 10.1016/j.intermet.2017.06.007

M3 - 文章

AN - SCOPUS:85021178180

SN - 0966-9795

VL - 90

SP - 16

EP - 22

JO - Intermetallics

JF - Intermetallics

ER -

Simultaneously achieving high tensile strength and fracture toughness of Ti/Ti-Al multilayered composites

Abstract

Keywords

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