In precipitation hardening, subcooling is done after immersion and then either artificial aging at 180-250C or natural aging at room temperature. Natural and artificial aging is an event that occurs by diffusion. Temperature and time parameters dominate here. Don't you think it is interesting that there is a sufficient temperature for diffusion at 180C and 250C, while diffusion occurs at room temperature? Could there be a situation that might have helped diffusion at room temperature? Please explain your answer in at most one sentence.