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Fabrication of TC4 and Ti48Al bimetals by plasma arc additive manufacturing: Microstructure and mechanical properties

Authors :
Zhen Wang
Wei Chen
Junqiang Xu
Jun Zhu
Zhanlin Ma
Jinfei Shi
Qi Zhou
Source :
Journal of Materials Research and Technology, Vol 32, Iss , Pp 2482-2494 (2024)
Publication Year :
2024
Publisher :
Elsevier, 2024.

Abstract

Plasma arc additive manufacturing (PAAM) was applied to fabricate TC4 and Ti48Al (gamma titanium aluminide) bimetals in this work. The impact of deposition sequence on the microstructure and mechanical properties of two groups of bimetals (TC4-Ti48Al, first deposited TC4, then Ti48Al; Ti48Al-TC4, first deposited Ti48Al, then TC4) was investigated. The results show that the ultimate tensile strengths of two groups of bimetals exhibit significant differences, with 158.4 MPa for TC4-Ti48Al and 232.3 MPa for Ti48Al-TC4, the reason for this disparity is the difference in microstructure at the transition zone, which is attributed to heat input and Marangoni convection. The phase transformation evolution of TC4-Ti48Al transition zone is (major α2 + minor α)→ (major α2 + minor γ) → (major γ + minor α2), and (major α2 + minor α) → (major α + minor α2) for Ti48Al-TC4. The formation mechanism of transition zones and relationship between the microstructure characteristics and mechanical properties of two groups of bimetals were further discussed. Overall, the property of Ti48Al-TC4 was superior, and this work provides a promising new method for the preparation of TC4 and Ti48Al bimetals.

Details

Language :
English
ISSN :
22387854
Volume :
32
Issue :
2482-2494
Database :
Directory of Open Access Journals
Journal :
Journal of Materials Research and Technology
Publication Type :
Academic Journal
Accession number :
edsdoj.75895939deee4e1491b72bcea9766805
Document Type :
article
Full Text :
https://doi.org/10.1016/j.jmrt.2024.08.101