Introducing transformation twins in titanium alloys: an evolution of α-variants during additive manufacturing

H. Wang; Q. Chao; L. Yang; M. Cabral; Z. Z. Song; B. Y. Wang; S. Primig; W. Xu; Z. B. Chen; S. P. Ringer; X. Z. Liao

doi:10.1080/21663831.2020.1850536

Introducing transformation twins in titanium alloys: an evolution of α-variants during additive manufacturing

H. Wang, Q. Chao, L. Yang, M. Cabral, Z. Z. Song, B. Y. Wang, S. Primig, W. Xu, Z. B. Chen (Corresponding Author), S. P. Ringer (Corresponding Author), X. Z. Liao (Corresponding Author)

Research output: Journal article publication › Journal article › Academic research › peer-review

38 Citations (Scopus)

Abstract

Titanium alloys can experience a cooling-induced phase transformation from a body-centred cubic phase into a hexagonal close-packed phase which occurs in 12 crystallographically equivalent variants. Among them, variant selection II, 60°/ (Formula presented.), is very close to the orientation of (Formula presented.) twins (57.42°/ (Formula presented.)). We propose that the cyclic thermal loading during additive manufacturing introduces large thermal stresses at high temperature, enabling grain reorientation that transforms the 60°/ (Formula presented.) variant boundaries into the more energetically stable 57.42°/ (Formula presented.) twin boundaries. This transformation twinning phenomenon follows a strain accommodation mechanism and the resulting boundary structure benefits the mechanical properties and thermal stability of titanium alloys.

Original language	English
Pages (from-to)	119-126
Number of pages	8
Journal	Materials Research Letters
Volume	9
Issue number	3
DOIs	https://doi.org/10.1080/21663831.2020.1850536
Publication status	Published - 18 Dec 2020
Externally published	Yes

Keywords

additive manufacturing
Titanium alloy
twinning mechanism
variant selections

ASJC Scopus subject areas

General Materials Science

More information

10.1080/21663831.2020.1850536

Cite this

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title = "Introducing transformation twins in titanium alloys: an evolution of α-variants during additive manufacturing",

abstract = "Titanium alloys can experience a cooling-induced phase transformation from a body-centred cubic phase into a hexagonal close-packed phase which occurs in 12 crystallographically equivalent variants. Among them, variant selection II, 60°/ (Formula presented.), is very close to the orientation of (Formula presented.) twins (57.42°/ (Formula presented.)). We propose that the cyclic thermal loading during additive manufacturing introduces large thermal stresses at high temperature, enabling grain reorientation that transforms the 60°/ (Formula presented.) variant boundaries into the more energetically stable 57.42°/ (Formula presented.) twin boundaries. This transformation twinning phenomenon follows a strain accommodation mechanism and the resulting boundary structure benefits the mechanical properties and thermal stability of titanium alloys.",

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author = "H. Wang and Q. Chao and L. Yang and M. Cabral and Song, {Z. Z.} and Wang, {B. Y.} and S. Primig and W. Xu and Chen, {Z. B.} and Ringer, {S. P.} and Liao, {X. Z.}",

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doi = "10.1080/21663831.2020.1850536",

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T1 - Introducing transformation twins in titanium alloys: an evolution of α-variants during additive manufacturing

AU - Wang, H.

AU - Chao, Q.

AU - Yang, L.

AU - Cabral, M.

AU - Song, Z. Z.

AU - Wang, B. Y.

AU - Primig, S.

AU - Xu, W.

AU - Chen, Z. B.

AU - Ringer, S. P.

AU - Liao, X. Z.

PY - 2020/12/18

Y1 - 2020/12/18

N2 - Titanium alloys can experience a cooling-induced phase transformation from a body-centred cubic phase into a hexagonal close-packed phase which occurs in 12 crystallographically equivalent variants. Among them, variant selection II, 60°/ (Formula presented.), is very close to the orientation of (Formula presented.) twins (57.42°/ (Formula presented.)). We propose that the cyclic thermal loading during additive manufacturing introduces large thermal stresses at high temperature, enabling grain reorientation that transforms the 60°/ (Formula presented.) variant boundaries into the more energetically stable 57.42°/ (Formula presented.) twin boundaries. This transformation twinning phenomenon follows a strain accommodation mechanism and the resulting boundary structure benefits the mechanical properties and thermal stability of titanium alloys.

AB - Titanium alloys can experience a cooling-induced phase transformation from a body-centred cubic phase into a hexagonal close-packed phase which occurs in 12 crystallographically equivalent variants. Among them, variant selection II, 60°/ (Formula presented.), is very close to the orientation of (Formula presented.) twins (57.42°/ (Formula presented.)). We propose that the cyclic thermal loading during additive manufacturing introduces large thermal stresses at high temperature, enabling grain reorientation that transforms the 60°/ (Formula presented.) variant boundaries into the more energetically stable 57.42°/ (Formula presented.) twin boundaries. This transformation twinning phenomenon follows a strain accommodation mechanism and the resulting boundary structure benefits the mechanical properties and thermal stability of titanium alloys.

KW - additive manufacturing

KW - Titanium alloy

KW - twinning mechanism

KW - variant selections

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DO - 10.1080/21663831.2020.1850536

M3 - Journal article

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SN - 2166-3831

VL - 9

SP - 119

EP - 126

JO - Materials Research Letters

JF - Materials Research Letters

IS - 3

ER -

Introducing transformation twins in titanium alloys: an evolution of α-variants during additive manufacturing

Abstract

Keywords

ASJC Scopus subject areas

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