Analysis of Primary Crystallization in Amorphous Aluminum Alloys. Perepezko, J., H., Tong, W., S., Hamann, J., Hebert, R., J., Rösner, H., R., & Wilde, G. Technical Report 2002. Paper Website abstract bibtex The annealing response of amorphous Al based alloy samples were\ninvestigated to assess the role of the as-quenched state on primary\ncrystallization of Al nanocrystals(nc). Continuous heating differential\nscanning calorimetry (DSC) traces of amorphous Al87Ni10Ce3 powders were\ncompared to those from melt spun ribbon (MSR) to examine the effect of\nsample subdivision on primary crystallization. While the powders\nexhibited the same onset temperature as MSR, thermal cycling\nexperiments show fine powder sizes reacting at the onset temperature\nand coarse powder sizes with the lowest melt quench rate transforming\nat the highest primary reaction temperature. In Al92Sm8 MSR, a kinetics\nanalysis of Al nc distributions indicates a notable effect of the\nas-quenched state on primary crystallization during isothermal\nannealing. With Al88Y7Fe5 MSR intense deformation can induce the\ndevelopment of an Al nc distribution without thermal annealing. In each\ncase examined, the results support the inclusion of quenched in\nclusters in the analysis of primary crystallization reactions.
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title = {Analysis of Primary Crystallization in Amorphous Aluminum Alloys},
type = {techreport},
year = {2002},
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abstract = {The annealing response of amorphous Al based alloy samples were\ninvestigated to assess the role of the as-quenched state on primary\ncrystallization of Al nanocrystals(nc). Continuous heating differential\nscanning calorimetry (DSC) traces of amorphous Al87Ni10Ce3 powders were\ncompared to those from melt spun ribbon (MSR) to examine the effect of\nsample subdivision on primary crystallization. While the powders\nexhibited the same onset temperature as MSR, thermal cycling\nexperiments show fine powder sizes reacting at the onset temperature\nand coarse powder sizes with the lowest melt quench rate transforming\nat the highest primary reaction temperature. In Al92Sm8 MSR, a kinetics\nanalysis of Al nc distributions indicates a notable effect of the\nas-quenched state on primary crystallization during isothermal\nannealing. With Al88Y7Fe5 MSR intense deformation can induce the\ndevelopment of an Al nc distribution without thermal annealing. In each\ncase examined, the results support the inclusion of quenched in\nclusters in the analysis of primary crystallization reactions.},
bibtype = {techreport},
author = {Perepezko, John H. and Tong, William S. and Hamann, Joe and Hebert, Rainer J. and Rösner, Harald R. and Wilde, Gerhard}
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