Tracking microstructure, texture and boundary misorientation evolution of hot deformed and post-deformation annealed Ti-6Al-4V alloy

Research output: Contribution to journalArticleResearchpeer-review

7 Citations (Scopus)

Abstract

The microstructure and texture of the two phase Titanium alloy Ti–6Al–4V is profoundly affected by its thermomechanical history. We performed compression tests on double cone samples to characterize the effects of strain and deformation speed on globularization of the lamellar microstructure, crystallographic texture and boundary misorientation development. Globularization is enhanced as strain increases and by post-deformation heat treatment. The morphology and crystallographic texture of the lamellae varies with strain: the lamellae gradually orientate perpendicular to the deformation direction, as do the basal planes. In contrast, the globular grains have a much weaker basal transverse texture after deformation. Post-deformation annealing has little effect on the texture for both the non-broken lamellar and globularized grains but it does increase the texture intensity of both structures and sharpen the basal transverse texture for the globularized grains. This implies that any modification of texture in this alloy must be conducted during deformation. The misorientation peaks which dominate the misorientation distribution of the initial colony lamellar microstructure are replaced mostly with lower angle boundaries in the lamellar microstructure and then with rather uniform distribution of high angle boundaries as strain increase. After post-deformation annealing, these peaks re-appear due to the increased presence of secondary alpha (transformed beta) phase caused by the annealing condition selected. A simple processing design chart was also established to identify microstructure and texture development with respect to percentage of reduction for hot compression at 850 °C.
Original languageEnglish
Pages (from-to)524 - 534
Number of pages11
JournalMaterials Science and Engineering A: Structural Materials: Properties, Microstructure and Processing
Volume651
DOIs
Publication statusPublished - 10 Jan 2016

Keywords

  • Titanium alloy
  • Microstructure
  • Texture evolution
  • Double-cone
  • Annealing

Cite this

@article{20bc195caf96443ea127edc0c5fe254c,
title = "Tracking microstructure, texture and boundary misorientation evolution of hot deformed and post-deformation annealed Ti-6Al-4V alloy",
abstract = "The microstructure and texture of the two phase Titanium alloy Ti–6Al–4V is profoundly affected by its thermomechanical history. We performed compression tests on double cone samples to characterize the effects of strain and deformation speed on globularization of the lamellar microstructure, crystallographic texture and boundary misorientation development. Globularization is enhanced as strain increases and by post-deformation heat treatment. The morphology and crystallographic texture of the lamellae varies with strain: the lamellae gradually orientate perpendicular to the deformation direction, as do the basal planes. In contrast, the globular grains have a much weaker basal transverse texture after deformation. Post-deformation annealing has little effect on the texture for both the non-broken lamellar and globularized grains but it does increase the texture intensity of both structures and sharpen the basal transverse texture for the globularized grains. This implies that any modification of texture in this alloy must be conducted during deformation. The misorientation peaks which dominate the misorientation distribution of the initial colony lamellar microstructure are replaced mostly with lower angle boundaries in the lamellar microstructure and then with rather uniform distribution of high angle boundaries as strain increase. After post-deformation annealing, these peaks re-appear due to the increased presence of secondary alpha (transformed beta) phase caused by the annealing condition selected. A simple processing design chart was also established to identify microstructure and texture development with respect to percentage of reduction for hot compression at 850 °C.",
keywords = "Titanium alloy, Microstructure, Texture evolution, Double-cone, Annealing",
author = "Lim, {Chao Voon Samuel} and Kun Yang and Yi Yang and Yufeng Cheng and Aijun Huang and Xinhua Wu and Davies, {Chris Huw John}",
year = "2016",
month = "1",
day = "10",
doi = "10.1016/j.msea.2015.09.060",
language = "English",
volume = "651",
pages = "524 -- 534",
journal = "Materials Science and Engineering A: Structural Materials: Properties, Microstructure and Processing",
issn = "0921-5093",
publisher = "Elsevier",

}

TY - JOUR

T1 - Tracking microstructure, texture and boundary misorientation evolution of hot deformed and post-deformation annealed Ti-6Al-4V alloy

AU - Lim, Chao Voon Samuel

AU - Yang, Kun

AU - Yang, Yi

AU - Cheng, Yufeng

AU - Huang, Aijun

AU - Wu, Xinhua

AU - Davies, Chris Huw John

PY - 2016/1/10

Y1 - 2016/1/10

N2 - The microstructure and texture of the two phase Titanium alloy Ti–6Al–4V is profoundly affected by its thermomechanical history. We performed compression tests on double cone samples to characterize the effects of strain and deformation speed on globularization of the lamellar microstructure, crystallographic texture and boundary misorientation development. Globularization is enhanced as strain increases and by post-deformation heat treatment. The morphology and crystallographic texture of the lamellae varies with strain: the lamellae gradually orientate perpendicular to the deformation direction, as do the basal planes. In contrast, the globular grains have a much weaker basal transverse texture after deformation. Post-deformation annealing has little effect on the texture for both the non-broken lamellar and globularized grains but it does increase the texture intensity of both structures and sharpen the basal transverse texture for the globularized grains. This implies that any modification of texture in this alloy must be conducted during deformation. The misorientation peaks which dominate the misorientation distribution of the initial colony lamellar microstructure are replaced mostly with lower angle boundaries in the lamellar microstructure and then with rather uniform distribution of high angle boundaries as strain increase. After post-deformation annealing, these peaks re-appear due to the increased presence of secondary alpha (transformed beta) phase caused by the annealing condition selected. A simple processing design chart was also established to identify microstructure and texture development with respect to percentage of reduction for hot compression at 850 °C.

AB - The microstructure and texture of the two phase Titanium alloy Ti–6Al–4V is profoundly affected by its thermomechanical history. We performed compression tests on double cone samples to characterize the effects of strain and deformation speed on globularization of the lamellar microstructure, crystallographic texture and boundary misorientation development. Globularization is enhanced as strain increases and by post-deformation heat treatment. The morphology and crystallographic texture of the lamellae varies with strain: the lamellae gradually orientate perpendicular to the deformation direction, as do the basal planes. In contrast, the globular grains have a much weaker basal transverse texture after deformation. Post-deformation annealing has little effect on the texture for both the non-broken lamellar and globularized grains but it does increase the texture intensity of both structures and sharpen the basal transverse texture for the globularized grains. This implies that any modification of texture in this alloy must be conducted during deformation. The misorientation peaks which dominate the misorientation distribution of the initial colony lamellar microstructure are replaced mostly with lower angle boundaries in the lamellar microstructure and then with rather uniform distribution of high angle boundaries as strain increase. After post-deformation annealing, these peaks re-appear due to the increased presence of secondary alpha (transformed beta) phase caused by the annealing condition selected. A simple processing design chart was also established to identify microstructure and texture development with respect to percentage of reduction for hot compression at 850 °C.

KW - Titanium alloy

KW - Microstructure

KW - Texture evolution

KW - Double-cone

KW - Annealing

UR - http://www.sciencedirect.com/science/article/pii/S0921509315303993

U2 - 10.1016/j.msea.2015.09.060

DO - 10.1016/j.msea.2015.09.060

M3 - Article

VL - 651

SP - 524

EP - 534

JO - Materials Science and Engineering A: Structural Materials: Properties, Microstructure and Processing

JF - Materials Science and Engineering A: Structural Materials: Properties, Microstructure and Processing

SN - 0921-5093

ER -