Hany R. Ammar and Khalil A. Khalil and El-Sayed M. Sherif
Thermally Stable Nanocrystalline Aluminum Alloys Processed by Mechanical Alloying and High Frequency Induction Heat Sintering
154 - 164
2015
9
1
International Journal of Materials and Metallurgical Engineering
https://publications.waset.org/pdf/10000509
https://publications.waset.org/vol/97
World Academy of Science, Engineering and Technology
The current study investigated the influence of milling
time and balltopowder (BPR) weight ratio on the microstructural
constituents and mechanical properties of bulk nanocrystalline Al;
Al10Cu; and Al10Cu5Ti alloys. Powder consolidation was
carried out using a high frequency induction heat sintering where the
processed metal powders were sintered into a dense and strong bulk
material. The powders and the bulk samples were characterized using
XRD and FEGSEM techniques. The mechanical properties were
evaluated at various temperatures of 25°C, 100°C, 200°C, 300°C and
400°C to study the thermal stability of the processed alloys. The
processed bulk nanocrystalline alloys displayed extremely high
hardness values even at elevated temperatures. The Al10Cu5Ti
alloy displayed the highest hardness values at room and elevated
temperatures which are related to the presence of Ticontaining
phases such as Al3Ti and AlCu2Ti. These phases are thermally stable
and retain the high hardness values at elevated temperatures up to
400ºC.
Open Science Index 97, 2015