Chapter Y: Y Yttrium

Y

Symbol for the element yttrium.

Y-alloy

An aluminum alloy used for casting. Contains aluminum, 4% copper, 2% nickel, 1.5% each of magnesium, silicon, and iron.

y-axis

The vertical axis on the Cartesian coordinate system, or coordinate plane.

Yb

Symbol for the element ytterbium.

yellow brass

(1) A general name for brass castings; (2) alloys nominally containing 65-67% copper, 34-37% zinc. Melt at 1639 F/893 C; having good ductility, high strength, corrosion resistance, and can with stand severe cold-working.

yellow brass, leaded

Alloys nominally containing 67-70% copper, 25-29% zinc, 3% lead, 1% tin, and good machinability.

yellow gold

Alloy nominally containing 53% gold, 25% silver, and 22% copper.

yield point

(1) The point at which stresses and trains become equal, so that deformation occurs. The point at which the stresses equal the elasticity of a test piece; (2) the initial stress in a material, usually less than the maximum attainable stress at which an increase in strain occurs without an increase in stress. Only certain metals exhibit a yield point. If there is a decrease in stress after yielding, a distinction may be made between upper and lower yield points.

yield strength

The stress at which a material exhibits a specified deviation from proportionality of stress and strain. The deviation is expressed in terms of strain. An offset of 0.2% is generally used for many metals.

Yoloy

A steel alloy containing 96.7% iron, 1% copper, 2% nickel, 0.15-0.2% carbon, and small amounts of phosphorus.

Young's modulus

See also modulus...