Microstructure and mechanical properties of TiC/Ti–6Al–4V composites processed by in situ casting route

Abstract

TiC/Ti-6Al-4V composites containing various volume fractions of TiC were produced by induction skull melting and common casting utilising in situ reaction between titanium and carbon powder. The microstructure and room tensile properties of as cast and heat treated TiC/Ti-6Al-4V composites were investigated. Bar-like or small globular eutectic TiC were found in 5 vol.-%TiC/ Ti-6Al-4V composite, whereas the equiaxed or dendritic primary TiC particles were found to be the main reinforcements in 10 and 15 vol.-%TiC/Ti-6Al-4V composites. The as cast TiC/Ti-6Al-4V composites have shown higher strength but lower ductility than those of monolithic Ti-6Al-4V alloy. The shape and fracture of TiC particles can strongly influence the fracture and failure of the composites, and so the ultimate tensile strengths and elongations of as cast composites reduce with the increase in volume fraction of TiC. TiC particles appear to be spheroidised, and titanium precipitation can be found within large TiC particles after heat treatment at 1050uC for 8 h, which can promote the resistance to fracture of composites. Therefore, the elongations of the composites increase significantly, and the ultimate tensile strengths also have marginal increase especially for the 10 and 15 vol.-%TiC/Ti-6Al-4V composites after heat treatment.

Microstructural characterization and mechanical properties of TiC/near-α Ti composite obtained at slow cooling rate

“…Small TiC particles can undertake higher load before final damage and spheroidised TiC can reduce the stress concentration and blunt the crack tips, which also favors the enhancement of room-temperature ductility. Similar conclusions were reported in previous literatures [29,30]. It should be noted that the simple heat treatment used in this work can be extended to TMCs reinforced with TiC particles to enhance their room-temperature ductility, which is the other novelty of the present work.…”

Laser and electron‐beam powder‐bed additive manufacturing of metallic implants: A review on processes, materials and designs

“…Ultimate tensile strength (MPa)1250-126770,85 830-115084,86 934-117387,88 Yield strength (MPa) 1110-112570,85 915-120084,86 862-99987,88 Elongation (%) 6-770,85 13-2584,86 6-787,88 Micro-hardness (HV) 479-61310,71 358-38784,86 294-36089,90 LASER AND ELECTRON-BEAM ADDITIVE MANUFACTURING OF METALLIC IMPLANTS…”

Modeling of shot-peening effects on the surface properties of a (TiB + TiC)/Ti–6Al–4V composite employing artificial neural networks

“…After the OS is selected and the MF is generated, operation of the network is tested with the use of them (OS & MF). Twenty sample data (data of samples [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] were used from the total of 30, as data sets for network training. Table 3 shows the normalized sample data used for networks training.…”

“…9 Titanium monoboride (TiB) whiskers and titanium carbide (TiC) particles offer high modulus, relative chemical stability, and high thermal stability, while maintaining similar density and thermal expansion coefficient to those of the titanium matrix, as well as clean interfaces without any unfavorable reaction between the precipitates and the titanium matrix. [10][11][12] The reinforcements were obtained according to the high-temperature reactions as follows in Equations (1) and (2): 13,14 5Ti+B4C = 4TiB+TiC…”