The Change of Microstructure at low temperature

Recently, we do some work about the dynamic strain aging. In order to investigate the function of solute clouds and precipitates in DSA, we do some experiments. The solution treated LY12 alloys are tested on MTS at low temperature (173K), and the Portevin-Le Chatelier phenomenon disappeared as we expected. But, we need more information about the change of microstructure under the low temperature, what is more the micro-optical observation should be finished in a very short time when we consider the effect of natural aging. Obviously the TEM can not meet our needs.

I wonder whether someone has done something about this or has some reference about the microstructure under low temperature. If so, please contact with me at xsm-super@hotmail.com. Thanks very much for your help!