What is the main difference between age and over age sample in magnesium alloys? how much secondary phase does make the best mechanical behaviour?

08 August 2016 1 2K Report

I want to know how much secondary phase after age treatment is necessary in magnesium alloys.

Dear Masoud,

The term aging means to strengthening an alloy by producing fine precipitates in the matrix. At the beginning, the precipitates are fine and this leads to a higher hardness and strength. The increase of hardness finally reaches to a maximum in a critical size and distribution of the precipitates after which it decreases again due to overaging. The term Over-Aging means that the rate of growth is much more than that of nucleation. So the precipitates get bigger and more rough. This micro-structure is not suitable and leads to a decrease in hardness and strength of the material. Overaging happens when you age the specimens in higher temperatures or in longer aging times. Please check the ASM metals handbook of metals to gain the standard aging temperature and time for your material.

Regards,

Soheil

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