Effect of thermal exposure on microstructure and tensile properties of laser deposited Ti60A alloy

Ali Zhang; Dong Liu; Huaming Wang

doi:10.1016/j.msea.2012.11.050

Effect of thermal exposure on microstructure and tensile properties of laser deposited Ti60A alloy

Ali Zhang
, Dong Liu
, Huaming Wang

Beihang University

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

29 Scopus citations

Abstract

A near α high-temperature titanium alloy Ti60A (Ti5.54Al3.38Sn3.34Zr0.37Mo0.46Si) was fabricated by laser melting deposition (LMD) manufacturing process. Room-temperature tensile properties before and after 600°C/100h thermal exposure were evaluated. Microstructural changes and tensile fracture characteristics were examined by OM, SEM and TEM equipped with EDX. Results indicate that α lamellae coarsening and the precipitation of incoherent silicides and coherent Ti₃Al in the alloys after thermal exposure cause the degradation of tensile properties. The silicides are confirmed to be hexagonal quasi-S₂ type (TiZr_0.3)₆Si₃, with a=0.71nm and c=0.37nm by electron diffraction analysis. Compared to wrought Ti60A alloy with coarse Widmanstatten microstructure, laser deposited Ti60A alloy with fine basket-weave microstructure exhibits slightly higher strength and ductility after thermal exposure. The effect of thermal exposure on tensile properties related to the precipitation of Ti₃Al and silicides is discussed.

Original language	English
Pages (from-to)	61-68
Number of pages	8
Journal	Materials Science and Engineering: A
Volume	562
DOIs	https://doi.org/10.1016/j.msea.2012.11.050
State	Published - 1 Feb 2013
Externally published	Yes

Keywords

Laser melting deposition
Mechanical properties
Microstructure
Thermal exposure
Titanium alloy

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10.1016/j.msea.2012.11.050

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@article{d0696d99d47b42fa9dbc737a127e265c,

title = "Effect of thermal exposure on microstructure and tensile properties of laser deposited Ti60A alloy",

abstract = "A near α high-temperature titanium alloy Ti60A (Ti5.54Al3.38Sn3.34Zr0.37Mo0.46Si) was fabricated by laser melting deposition (LMD) manufacturing process. Room-temperature tensile properties before and after 600°C/100h thermal exposure were evaluated. Microstructural changes and tensile fracture characteristics were examined by OM, SEM and TEM equipped with EDX. Results indicate that α lamellae coarsening and the precipitation of incoherent silicides and coherent Ti3Al in the alloys after thermal exposure cause the degradation of tensile properties. The silicides are confirmed to be hexagonal quasi-S2 type (TiZr0.3)6Si3, with a=0.71nm and c=0.37nm by electron diffraction analysis. Compared to wrought Ti60A alloy with coarse Widmanstatten microstructure, laser deposited Ti60A alloy with fine basket-weave microstructure exhibits slightly higher strength and ductility after thermal exposure. The effect of thermal exposure on tensile properties related to the precipitation of Ti3Al and silicides is discussed.",

keywords = "Laser melting deposition, Mechanical properties, Microstructure, Thermal exposure, Titanium alloy",

author = "Ali Zhang and Dong Liu and Huaming Wang",

year = "2013",

month = feb,

day = "1",

doi = "10.1016/j.msea.2012.11.050",

language = "英语",

volume = "562",

pages = "61--68",

journal = "Materials Science and Engineering: A",

issn = "0921-5093",

publisher = "Elsevier Ltd",

}

TY - JOUR

T1 - Effect of thermal exposure on microstructure and tensile properties of laser deposited Ti60A alloy

AU - Zhang, Ali

AU - Liu, Dong

AU - Wang, Huaming

PY - 2013/2/1

Y1 - 2013/2/1

N2 - A near α high-temperature titanium alloy Ti60A (Ti5.54Al3.38Sn3.34Zr0.37Mo0.46Si) was fabricated by laser melting deposition (LMD) manufacturing process. Room-temperature tensile properties before and after 600°C/100h thermal exposure were evaluated. Microstructural changes and tensile fracture characteristics were examined by OM, SEM and TEM equipped with EDX. Results indicate that α lamellae coarsening and the precipitation of incoherent silicides and coherent Ti3Al in the alloys after thermal exposure cause the degradation of tensile properties. The silicides are confirmed to be hexagonal quasi-S2 type (TiZr0.3)6Si3, with a=0.71nm and c=0.37nm by electron diffraction analysis. Compared to wrought Ti60A alloy with coarse Widmanstatten microstructure, laser deposited Ti60A alloy with fine basket-weave microstructure exhibits slightly higher strength and ductility after thermal exposure. The effect of thermal exposure on tensile properties related to the precipitation of Ti3Al and silicides is discussed.

AB - A near α high-temperature titanium alloy Ti60A (Ti5.54Al3.38Sn3.34Zr0.37Mo0.46Si) was fabricated by laser melting deposition (LMD) manufacturing process. Room-temperature tensile properties before and after 600°C/100h thermal exposure were evaluated. Microstructural changes and tensile fracture characteristics were examined by OM, SEM and TEM equipped with EDX. Results indicate that α lamellae coarsening and the precipitation of incoherent silicides and coherent Ti3Al in the alloys after thermal exposure cause the degradation of tensile properties. The silicides are confirmed to be hexagonal quasi-S2 type (TiZr0.3)6Si3, with a=0.71nm and c=0.37nm by electron diffraction analysis. Compared to wrought Ti60A alloy with coarse Widmanstatten microstructure, laser deposited Ti60A alloy with fine basket-weave microstructure exhibits slightly higher strength and ductility after thermal exposure. The effect of thermal exposure on tensile properties related to the precipitation of Ti3Al and silicides is discussed.

KW - Laser melting deposition

KW - Mechanical properties

KW - Microstructure

KW - Thermal exposure

KW - Titanium alloy

UR - https://www.scopus.com/pages/publications/84870697488

U2 - 10.1016/j.msea.2012.11.050

DO - 10.1016/j.msea.2012.11.050

M3 - 文章

AN - SCOPUS:84870697488

SN - 0921-5093

VL - 562

SP - 61

EP - 68

JO - Materials Science and Engineering: A

JF - Materials Science and Engineering: A

ER -

Effect of thermal exposure on microstructure and tensile properties of laser deposited Ti60A alloy

Abstract

Keywords

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