Date of Award


Degree Name

Master of Science


Metallurgical and Materials Engineering


Shailendra K. Varma


The effect of Ag on the microstructure developed in Al-Cu-Ni-Mn alloy has been determined. The modified Al-Cu-Ni-Mn alloy by Ag addition shows the presence of three microconstituents consisting of phases rich in (1) Cu, (2) Ni, and (3) Ag. The foregoing alloys heated for 24 hours from 600 to 1000 °C show excellent oxidation resistance. Oxide formation and microstructural changes of the alloy have been characterized by elemental mapping and X-ray diffraction (XRD). Results show that the elements of Al and Mn preferentially oxidize while Cu and Ni provide oxidation resistance to the alloy. Hardness was taken on the alloy and its microconstituents before and after oxidation. In the as-received condition, the microconstituent with the highest hardness is Ag-rich (429 HV), and the lowest with Cu-rich (392 V). After oxidation at 1000 °C, Ni-rich has the highest (447 HV) and Ag-rich the lowest (112 HV) hardness. Grain size measurement was performed to observe the change and amount of the microconstituents. Hardness and grain size measurements have been taken to make a Hall-Petch relationship.




Recieved from ProQuest

File Size

57 p.

File Format


Rights Holder

Gina Zavala Alvarado