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Papers by Ajaz Ali
Tribology International, 2022
At 600 • C, a TiB 2-Al 2 O 3-Ti(20 %) coating was deposited by electron beam deposition (EBD) on ... more At 600 • C, a TiB 2-Al 2 O 3-Ti(20 %) coating was deposited by electron beam deposition (EBD) on high-speed steel (HSS) substrates. X-ray diffraction and field emission scanning electron microscope and energy-dispersive X-ray spectroscopy were used to investigate the structural analysis and surface morphology of TiB 2-Al2O 3-Ti(20 %) coating. The effect of load on Young's modulus and hardness was studied using mechanical experiments on TiB 2-Al 2 O 3-Ti(20 %) coatings at modest loads ranging from 2000 to 10000 µN. Nanoscratch was done on TiB 2-Al2O 3-Ti(20 %) coated on HSS and uncoated HSS sample at a low load of 0-10000µN, and the coated sample had a COF of 0.08-0.21, whereas the uncoated sample had a COF of 0.2-0.46. To investigate the deformation and failure behavior of the coating/substrate combination and their nanotribological properties, nano wear experiments were done on TiB 2-Al 2 O 3-Ti(20 %) coatings at loads ranging from 0.5 N to 2 N. The results demonstrate that Young's modulus and hardness of the TiB2-Al2O3-Ti(20 %) coating decreases when the load increases. The TiB 2-Al 2 O 3-Ti(20 %) coating has a coefficient of friction(COF) ranging from 0.08 to 0.17, indicating that it is selflubricating, whereas the COF of uncoated HSS is 0.1-0.58. With increasing stress, the wear rate of TiB 2-Al 2 O 3-Ti(20 %) coating grows from 2.6808 × 10 − 3 to 4.461 × 10 − 3 mm 3 /m, while uncoated HSS wears from 6.4367 × 10 − 3 to 21.2 × 10 − 3. The TiB 2-Al 2 O 3-Ti(20 %) coating had smooth wear scars having no cracks/debris on the sample surface, indicating that the coated material flowed near the wear scar in a plastic manner.
Tribology International, 2022
At 600 • C, a TiB 2-Al 2 O 3-Ti(20 %) coating was deposited by electron beam deposition (EBD) on ... more At 600 • C, a TiB 2-Al 2 O 3-Ti(20 %) coating was deposited by electron beam deposition (EBD) on high-speed steel (HSS) substrates. X-ray diffraction and field emission scanning electron microscope and energy-dispersive X-ray spectroscopy were used to investigate the structural analysis and surface morphology of TiB 2-Al2O 3-Ti(20 %) coating. The effect of load on Young's modulus and hardness was studied using mechanical experiments on TiB 2-Al 2 O 3-Ti(20 %) coatings at modest loads ranging from 2000 to 10000 µN. Nanoscratch was done on TiB 2-Al2O 3-Ti(20 %) coated on HSS and uncoated HSS sample at a low load of 0-10000µN, and the coated sample had a COF of 0.08-0.21, whereas the uncoated sample had a COF of 0.2-0.46. To investigate the deformation and failure behavior of the coating/substrate combination and their nanotribological properties, nano wear experiments were done on TiB 2-Al 2 O 3-Ti(20 %) coatings at loads ranging from 0.5 N to 2 N. The results demonstrate that Young's modulus and hardness of the TiB2-Al2O3-Ti(20 %) coating decreases when the load increases. The TiB 2-Al 2 O 3-Ti(20 %) coating has a coefficient of friction(COF) ranging from 0.08 to 0.17, indicating that it is selflubricating, whereas the COF of uncoated HSS is 0.1-0.58. With increasing stress, the wear rate of TiB 2-Al 2 O 3-Ti(20 %) coating grows from 2.6808 × 10 − 3 to 4.461 × 10 − 3 mm 3 /m, while uncoated HSS wears from 6.4367 × 10 − 3 to 21.2 × 10 − 3. The TiB 2-Al 2 O 3-Ti(20 %) coating had smooth wear scars having no cracks/debris on the sample surface, indicating that the coated material flowed near the wear scar in a plastic manner.