Nickel Balls

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Nickel is a versatile metal that can be used in many applications, from plumbing to aerospace. It is also used in various alloys, including nickel steel and nickel aluminum bronze. Nickel is a very hard and durable metal that is corrosion-resistant and has good electrical properties. It is also an excellent alloying metal for other metals.

The nickel ball is a phenomenon in baseball that occurs when certain orientations of the seam on a curveball result in a circular pattern on the ball. The effect is caused by the pitcher gripping the ball with either one or two fingers in a way that causes the axis pole of the seam to be at a particular location on the ball, which causes it to precess during spin and deflection.

A sinterable nickel/alumina nanocomposite was fabricated with a powder metallurgy method using high-energy ball milling (HEBM) and spark plasma sintering (SPS). Several alumina fractions (0, 5, and 15% by volume) were incorporated into the nickel base to determine their effects on the microstructure and friction behavior of the composite. The nickel/alumina nanocomposite was tested for its frictional behavior by sliding against a steel ball in a pin-on-disk tester.

SEM and EDS images of the worn surfaces of the G-Ni-3 sample and the steel ball are shown in Figs. 5 and 6. The wear scar on the steel ball exhibits a shallow and coarse surface at low sucrose content, while it becomes deeper and smoother with increasing sucrose content. The wear of the nickel/alumina nanocomposite is characterized by the formation of a carbon-rich tribofilm on the steel ball.