Tensile creep of an additively manufactured Ti-48Al-2Cr-2Nb alloy with a layered microstructure

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

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Author(s)

  • Hui Tao
  • Huizhong Li
  • Jiahui Li
  • Li Wang
  • Xiaofen Tan
  • Weiwei He
  • Xiaopeng Liang

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article number147288
Journal / PublicationMaterials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
Volume916
Online published24 Sept 2024
Publication statusPublished - Nov 2024

Link(s)

DOI

DOI
Check@CityULib
Link to Scopus https://www.scopus.com/record/display.uri?eid=2-s2.0-85204959511&origin=recordpage
Permanent Link https://scholars.cityu.edu.hk/en/publications/publication(bbefca99-abff-4213-942c-d9eb0c161d1f).html

Abstract

This study investigated the tensile creep behavior of Ti-48Al-2Cr-2Nb alloy with a layered microstructure produced by selective electron beam melting (SEBM). Creep tests were conducted on a range of temperatures from 750 to 850 °C, and stresses from 120 to 280 MPa. The stress exponents (n) varied from 6.3 to 5.1 with increasing temperature, and the apparent activation energy (Qc) was determined to be 436.8 kJ/mol under 200 MPa. The observations indicated that at 750 °C and 800 °C, cross-slip bands and deformation twins tend to form in coarse grain (CG) regions. At 850 °C, extensive dynamic recrystallization (DRX) concentrated in fine-grained (FG) regions and the heterogeneous interfaces, characterized by discontinuous dynamic recrystallization (DDRX). A small number of continuous dynamic recrystallization (CDRX) grains appeared in CGs and were characterized by sub-grain rotation. The results suggest that local stress concentration induced by deformation twins and cross-slip bands within CGs may nucleate and merge to form cavities. © 2024 Elsevier B.V.

Research Area(s)

  • Dynamic recrystallization (DRX), Microstructural evolution, Selective electron beam melting, Tensile creep, TiAl alloy

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Publication fingerprints text

100
recrystallization INIS
100
microstructure INIS
100
dynamics INIS
100
alloys INIS
100
creep INIS
100
Alloy Material Science
100
Temperature Material Science
100
Creep Material Science
100
Edge Dislocation Material Science
100
Ti48Al2Nb2Cr Alloy Keyphrases
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Citation Format(s)

[ RIS ] [ BibTeX ]
Tensile creep of an additively manufactured Ti-48Al-2Cr-2Nb alloy with a layered microstructure. / Tao, Hui; Li, Huizhong; Li, Jiahui et al.
In: Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing, Vol. 916, 147288, 11.2024.

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review