Mar 13, 2012 Â·. The term age hardening is a general term referring to most (if not all) time and/or thermal treatments to increase the strength (and sometimes the ductility) of a heat-treated metal. It can result the release of built-in stresses or permit phases locked in (due to quenching) to transform .
NRA stands for National Rifle Association. The group was founded in 1871 as a recreational group designed to promote and encourage rifle shooting on a scientific basis. The NRA's path into political lobbying began in 1934 when it began mailing members with information about upcoming firearms bills.
Magnetic Resonance Angiogram (MRA). Guide. A magnetic resonance angiogram (MRA) is a type of magnetic resonance imaging (MRI) scan that uses a magnetic field and pulses of radio wave energy to provide pictures of blood vessels inside the body.