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Materials Science in Additive Manufacturing Multi-material Ti6Al4V-B4C through L-DED

A B

C D

E F

Figure 9. Scanning electron microscope (SEM) and optical images of the fracture surfaces of the radial composite (RC) cylinders. (A) Cleavage ridges,
originating from the location of the B4C particles in the matrix materials, without any movement of the particles. (B) B4C particles and surface texture of
(A). (C) Optical image of a crack after the B4C particles shifted through the matrix material. (D) Grooving of the matrix material by the B4C particles. (E)
Cleavage ridges and planes of the Ti64 matrix without B4C particles. (F) Low magnification image of the base of the cylinder.

cylinders, wearing down the cemented carbide-cutting 5. Conclusion
inserts that were used to turn the samples in Figure 7C. A radial multi-material structure was designed and
The increase in wear resistance can be beneficial for parts manufactured with a composition consisting of pure Ti64
operating in environments with significant contact and and a composite containing 5 wt.% B4C in Ti64. Multi-
rubbing, where the part will endure significant wear. The material structures were compared to pure samples. The
shell’s enhanced wear resistance can be imparted to the results from the uniaxial compression study displayed that
exterior surfaces of Ti parts through other means (besides adding B4C increased the compressive strength, hardness,
DED-based AM), such as the addition of B4C into a Ti and wear resistance of thfe RC samples compared to the
matrix. 15,16,25-27 The hard shell can also enhance the fatigue control Ti64. YS was increased by ~48% in the treated
resistance of these additively manufactured RC structures, samples compared to the control, with minimal change
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and future studies will focus on such characterization. in the elastic modulus between all three sample types.
Finally, other reinforcements have also been utilized with The hardness of the matrix increased by ~58% in the RC
Ti using different metal AM processes. Future studies will shell compared to the Ti64 control. The microstructure
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focus on some of those reinforcement phases to compare also displayed a well-meshed interface between the B4C
the variations in properties as a function of processing particles and the Ti64 matrix. Within the Ti64 matrix
variables. of the RC, there is also a change in the size of the α-Ti

Volume 3 Issue 3 (2024) 10 doi: 10.36922/msam.3571