When the natural ageing when left at room temperature to the precipitation of a finely dispersed second phase in the matrix has a hardness increased by the The second phase then precipitated at room temperature, but the hardness is increased slowly. when is compared to artificial ageing hardness for one min at 170 degree Celsius is that ageing hardness for one min at 170 degree Celsius is hard to make because of the lack of changing phase matrix.
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