Term in the field of heat treatment.

After the casting has reached the respective treatment temperature, it is “held” at this temperature for a certain amount of time. In this case, the holding time or holding period refers to the time span.

An example for the influence of the hold period (aging duration) on the mechanical properties of the Al Si9Cu3(Fe) alloy is shown in Fig. 1.

Additional references:
Heat treatment of hardenable aluminum alloys
Tempering, Hardening and tempering


  • Fig. 1: Al Si9Cu3(Fe)DT5, specimens from die-cast parts, yield strength curves as a function of holding period (aging period) and holding temperature according to H. Rockenschaub, FT&E, T. Pabel and G. Geier, courtesy of KTM Sportmotorcycle GmbH.