MIL-DTL-46027K(MR)
6.5.3.3 H3. Strain hardened and stabilized
6.5.3.4 H4. Strain hardened and lacquered or painted. This assumes that thermal affects
from the coating process affect the strain hardening; not encountered often.
6.6 Definitions. According to the Aluminum Association.
6.6.1 Temper. Temper is the state of an alloy based on its processing route, i.e.
metallurgical processes performed on an alloy. Temper of an alloy determines its
mechanical properties as well as some other properties.
6.6.2 Recovery. The process preceding re-crystallization in point of time, or at lower
temperatures when a deformed (cold worked) metal is heated. It is characterized by
changes in internal stresses and physical properties, but is not accompanied by marked
changes in mechanical properties or detectable micro-structural changes.
6.6.3 Stabilizing. The cold worked tempers of certain aluminum alloys will gradually
soften on standing at room temperature over a long period of time. Stabilizing is a
recovery treatment given to these alloys in order to eliminate age softening effects and to
achieve strength and hardness that do not show further change on standing at room
temperature
6.6.4 Annealing. A process involving heating and cooling to induce softening. In
wrought Aluminum, the term generally indicates a treatment above the re-crystallization
temperature.
6.6.5 Cold Working or Cold deformation. Working a metal at such a temperature and
rate that strain hardening occurs. This means simply working below re-crystallization
temperature.
6.6.6 Recrystallization. The process of nucleation and growth by which the deformed
and stressed grains are replaced by a new system of essentially equi-axed and stress free
grains.
6.6.7 Nucleation. The formation of aggregates of atoms which are stable enough to grow
and form new grains upon heating after deformation.
6.6.8 Partial Annealing. A treatment below the re-crystallization temperature, used to
bring fully strain hardened alloy back to a desired intermediate strength. The terms
"Recovery" and "Stress relief" also used for this type of treatment in some cases.
6.7 Alternate ballistic testing facility. Request for approval for an alternate ballistic
testing facility should be forwarded by the procuring activity to the Director, U.S. Army
Research Laboratory, Weapons and Materials Research Directorate, Specifications and
Standards Office, Attn: AMSRD-ARL-WM-MC, Aberdeen Proving Ground, MD 21005-
5069 and should be obtained prior to the contract award. Please note that alternate
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