Thermal Stability of Vacuum Hot Pressed Bulk Nanostructured Al-Cu Alloys
Bulk nanostructured Al-4Cu alloy was synthesized by high energy ball milling followed by vacuum hot pressing. Its thermal stability was investigated up to 450°C using differential scanning calorimetry, X-ray diffraction, and transmission electron microscopy. The results showed that grain growth in this Al-4Cu alloy was very limited and grain sizes in the range of 100 nm were still present in the alloys after exposure to 450 °C corresponding to a temperature as high as 0.77 T/Tm. The TEM investigations reveal that such a high thermal stability against grain growth observed in this alloy is attributed to the presence of ultrafine dispersoids.
Hajo Dieringa, Norbert Hort and Karl Ulrich Kainer
T. Shanmugasundaram et al., "Thermal Stability of Vacuum Hot Pressed Bulk Nanostructured Al-Cu Alloys", Materials Science Forum, Vol. 690, pp. 234-237, 2011