A TC4/TiAl bimetallic structure (BS) was successfully fabricated by laser additive manufacturing (LAM) to investigate the microstructure evolution of the transition zone. The results presented that the microstructures of the transition zone consisted of α (α-Ti), α2 (Ti3Al) and γ (TiAl). The evolution rule of the microstructures was (more α + less α2) → (more α2 + less γ) → (more γ + less α2) from the TC4 alloy side to the TiAl alloy side in the transition zone. The mechanical properties of the LAMed BS specimens revealed that the tensile strength reached that of the as-deposited TiAl alloy. The fracture was located at the TiAl alloy side near the transition zone and the fracture surfaces showed a quasi-cleavage fracture morphology.
WuYZhangSQChengXInvestigation on solid-state phase transformation in a Ti-47Al-2Cr-2V alloy due to thermal cycling during laser additive manufacturing process. J Alloy Compd.2019; 799:325–333.
2.
WangTZhuYYZhangSQGrain morphology evolution behavior of titanium alloy components during laser melting deposition additive manufacturing. J Alloy Compd.2015; 632:505–513.
3.
ChenYYYueHYWangXPSelective electron beam melting of TiAl alloy: microstructure evolution, phase transformation and microhardness. Mater Char.2018; 142:584–592.
4.
YeXCXiaoKQCaoRXMicrostructure evolution and microhardness of TiAl based alloy blade by vacuum suction casting. Vacuum. 2019; 163:186–193.
5.
CaiXLSunDQLiHMDissimilar joining of TiAl alloy and Ni-based superalloy by laser welding technology using V/Cu composite interlayer. Opt Laser Technol. 2019; 111:205–213.
6.
ZhuLLiJSTangBMicrostructure evolution and mechanical properties of diffusion bonding high Nb containing TiAl alloy to Ti2AlNb alloy. Vacuum. 2019; 164:140–148.
7.
BobbioLDOtisRABorgoniaJPAdditive manufacturing of a functionally graded material from Ti-6Al-4V to Invar: experimental characterization and thermodynamic calculations. Acta Mater.2017; 127:133–142.
8.
WuYChengXZhangSQMicrostructure and phase evolution in γ-TiAl/Ti2AlNb dual alloy fabricated by direct metal deposition. Intermetallics. 2019; 106:26–35.
9.
ShangCXuGJWangCYLaser deposition manufacturing of bimetallic structure from TA15 to Inconel 718 via copper interlayer. Mater Lett.2019; 252:342–344.
10.
CaiXLSunDQLiHMMicrostructure characteristics and mechanical properties of laser-welded joint of γ-TiAl alloy with pure Ti filler metal. Opt Laser Technol.2017; 97:242–247.
11.
ShangCWangCYXuGJLaser additive manufacturing of TA15 – Inconel 718 bimetallic structure via Nb/Cu multi-interlayer. Vacuum. 2019; 169:108888.
12.
QuHPLiPZhangSQMicrostructure and mechanical property of laser melting deposition (LMD) Ti/TiAl structural gradient material. Mater Des. 2010; 31:574–582.
13.
ZhangYZLiuYTZhaoXHThe interface microstructure and tensile properties of direct energy deposited TC11/Ti2AlNb dual alloy. Mater Des.2016; 110:571–580.
14.
XuZJZhangYZLiuMKInterface microstructure evolution and bonding strength of TC11/γ-TiAl bi-materials fabricated by laser powder deposition. Rare Met.2016; 35:456–462.
15.
SabbanRBahlSChatterjeeKGlobularization using heat treatment in additively manufactured Ti-6Al-4V for high strength and toughness. Acta Mater.2019; 162:239–254.
16.
LiuZQXuGJMaRXChin J Lasers. 2019; 46:146–152.
17.
ZhangYZHuangCWuXYMicrostructure and mechanical properties of laser direct deposited γ-TiAl alloy. Chin J Lasers. 2010; 37:2684–2688.
18.
LiuZQMaRXXuGJLaser additive manufacturing of bimetallic structure from Ti-6Al-4V to Ti-48Al-2Cr-2Nb via vanadium interlayer. Mater Lett.2020; 263:127210.
19.
ZhangYWangXPKongFTA high-performance β-solidifying TiAl alloy sheet: multi-type lamellar microstructure and phase transformation. Mater Char.2018; 138:136–144.
20.
MukherjeeTZhangWDebroyT.An improved prediction of residual stresses and distortion in additive manufacturing. Comp Mater Sci.2017; 126:360–372.
21.
HanKWangHQZhangBGEffect of thermal compensation on microstructure and mechanical properties of electron-beam welded joint for high-Nb containing TiAl/Ti600 alloys. Mater Des.2017; 131:273–285.
