CONSOLIDATION AND FORMING OF RAPIDLY SOLIDIFIED POWDER OF SOME ALUMINUM BASE ALLOY
MOHAMED MOHAMED ZAKY AHMED;
Abstract
The new processing of alloys by rapid solidification and mechanical alloying stop shortly before the final bulk material production. The improved properties obtained by those processing method should not be impairs during the transformation to bulk form. The present work is in an attempt in this direction.
Four aluminum base alloys are studied in this work, Al-6%Mn, Al-6%Mn-2%Ti, Al-10%Mn and Al-10%Mn-2%Ti. Alloys produced using conventional casting method and the _ produced as cast alloys are characterized using hardness measurement and microstructure examination. As cast alloys are remelted and rapidly solidified using twin-roll technique to produce rs-ribbons of thickness 20-
100 micrometer. RS -ribbons are used as initial material for the mechanical
milling process to produce powders. Milling process is carried out under inert atmosphere with ball to powder ratio of 10:1,with different milling times 5, 15 and 30hrss to produce different particle size materials. RS-ribbons and powders produced at different milling times are characterized using X-ray diffraction (XRD), Differential thermal analysis (OTA).
Powders form alloys are consolidated into bulk material using two techniques of consolidation. The first techniqueinvolves cold pressing followed by sintering at different temperatures 200, 300 and 400C for lhrs. The second technique involves cold pressing followed by hot pressing at different temperatures 200, 300 and 400C. Bulk materials produced from those two techniques are characterized using density measurement, hardness measurement and microstructure analysis.
X-ray diffraction analysis indicated that both increasing Mn concentration and addition of 2%Ti enhances the formation of metastable icoshedral phase, also increasing milling time enhances the formation of icoshedral phase during milling process. Milling is also observed to decrease the particle size, which could be related to the increases in the hardness of, produced material.
Four aluminum base alloys are studied in this work, Al-6%Mn, Al-6%Mn-2%Ti, Al-10%Mn and Al-10%Mn-2%Ti. Alloys produced using conventional casting method and the _ produced as cast alloys are characterized using hardness measurement and microstructure examination. As cast alloys are remelted and rapidly solidified using twin-roll technique to produce rs-ribbons of thickness 20-
100 micrometer. RS -ribbons are used as initial material for the mechanical
milling process to produce powders. Milling process is carried out under inert atmosphere with ball to powder ratio of 10:1,with different milling times 5, 15 and 30hrss to produce different particle size materials. RS-ribbons and powders produced at different milling times are characterized using X-ray diffraction (XRD), Differential thermal analysis (OTA).
Powders form alloys are consolidated into bulk material using two techniques of consolidation. The first techniqueinvolves cold pressing followed by sintering at different temperatures 200, 300 and 400C for lhrs. The second technique involves cold pressing followed by hot pressing at different temperatures 200, 300 and 400C. Bulk materials produced from those two techniques are characterized using density measurement, hardness measurement and microstructure analysis.
X-ray diffraction analysis indicated that both increasing Mn concentration and addition of 2%Ti enhances the formation of metastable icoshedral phase, also increasing milling time enhances the formation of icoshedral phase during milling process. Milling is also observed to decrease the particle size, which could be related to the increases in the hardness of, produced material.
Other data
| Title | CONSOLIDATION AND FORMING OF RAPIDLY SOLIDIFIED POWDER OF SOME ALUMINUM BASE ALLOY | Other Titles | كبس وتشكيل مسحوق بعض سبائك الالومنيوم المنتجة بعملية التبريد فائق السرعة | Authors | MOHAMED MOHAMED ZAKY AHMED | Issue Date | 2002 |
Attached Files
| File | Size | Format | |
|---|---|---|---|
| B15040.pdf | 906.66 kB | Adobe PDF | View/Open |
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