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                          Heat Treatment Requirements

Yellow Brass
65% copper and 35% zinc. Also known as High Brass. A copper-zinc alloy, named for its yellow hue. Formerly a very popular alloy, but now largely replaced by Cartridge Brass.

Yield Point
The first stress in a material less than the maximum obtainable stess at which an increase in strain occurs without an increase in stress. Also known as upper yield stress.

Yield Point
The first 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 Point
The load per unit of original cross section at which, in soft steel, a marked increase in deformation occurs without increase in load.

Yield Strength
The stress at which a material exhibits a specified deviation from propertionality of stress and strain. An offset of 0.2% is used for many metals.

Yield Strength
The stress at which a material exhibits a specified limiting deviation from the proportionality of stress to strain. The deviation is expressed in terms of strain. Also known as proof stress.

Young's Modulus
The coefficient of elasticity of stretching. For a stretched wire, Young's Modulus is the ratio of the stretching force per unit cross-sectional area to the elongation per unit length. The values of Young's Modulus for metals are of the order 10(12) dynes per square cm.