NATURE OF AN ENDOTHERMIC PEAK OF AS-QUENCHED AL-11.8 MOL-PERCENT-LI ALLOYS

In-situ and simultaneous synchrotron-radiation small-angle/100 scatter ing (SR-SAS/100) experiments have been performed at beam-line 15A of P hoton Factory, KEK Japan. The structural change during heating as-quen ched Al-11.8 mol%Li samples has been examined by analyzing SAS and 100 profiles. It was found that the endothermic reactions observed in dif ferential scanning calorimetry (DSC) experiments around 400 K correspo nd to the disordering of ordered regions formed during quench. The mic rostructure formed during the quench has been discussed in terms of th e change of the characteristic lengths for compositional fluctuation a nd that for ordering during heating.