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- 저자 : Arshad Noor Siddiquee (검색결과 2 건)
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Characterization of Ti–Al Intermetallic Synthesized by Mechanical Alloying Process
Manoj Kumar Yadav,Arshad Noor Siddiquee,Zahid A. Khan 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.7
Mechanical alloying (MA) of Al60Ti40 (wt%) has been successfully done by using a planetary ball mill having mixed ballsof 5 mm and 15 mm diameter to refne the crystallite size of the elemental powder and to get the new MAed phase of AlTi. The microstructural and morphological analysis of elemental as well as the processed powder was done with help of ScanningElectron Microscope and X-Ray difraction technique. Mechanical alloying of elemental Al and Ti resulted in the formationof AlTi phases with the refection of α-Ti3Al and TiAl3. The average particle size was reduced around 7 times after 60 h ofmilling. The mean crystallite size of MAed powder was also reduced up to 85 nm after 60 h of mechanical alloying undercontrolled conditions.
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Mohammed Ubaid,Dhruv Bajaj,A. K. Mukhopadhyay,Arshad Noor Siddiquee 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.12
Friction stir welding (FSW) of thick aluminium sections will pave way for remarkable new defence applications, providedthe accompanying challenges are successfully addressed. These challenges include elimination of tunnel defects, loss ofstrength in heat-treatable aluminium alloys, tool design and excessive process forces. Accounts of defect elimination, detailedmicro-structural and mechanical characterization for thick section FSW are scarce in the published literature. Further, specialstrategies such as bobbin tool, pre-drilled hole for plunging and inverted double pass are generally deployed to overcomethese challenges. This makes the process less productive and complex. In the present work, armor grade aluminum alloyAA2519-T87 plates having a thickness of 15.4 mm have been successfully joined with a joint efficiency of greater than 75%without supplementary strategies. The disparity in the effects of tool rotational speed and welding speed in the formation ofa sound weld has been addressed in detail to enhance the understanding of FSW of thick sections. Micro-hardness measurementshave been carried out throughout the transverse cross-section of the welds and correlated with different zones andtheir corresponding microstructures. Scanning electron microscopy and X-ray energy dispersive spectroscopy have beenused to characterize the coarse phase particles present in the weld zones.
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