Abstract

We have investigated the changes of the forward and reverse transformation temperatures in Cu–Zn–Al alloys with aging time in the β-phase after a step-quench by electrical resistivity measurements. With aging in the β-phase, the M s and M f temperatures increase and return to the normal values quickly, but the A s and A f temperatures still decrease toward the normal values even after the M s and M f temperatures reach the normal values. We will discuss briefly the reasons why the reverse transformation temperatures continue to change even after the forward transformation temperatures reach the normal values.

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