Sahoo, K L and Sahu, Rina and Mitra, A (2007) Kinetic aspects of the nanocrystallization and evolution of microhardness in Al92-XNi8LaX amorphous alloys. Materials and Manufacturing Processes, 22 (4). pp. 497-501.
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Marginal glass forming Al-based alloys have attracted considerable attention due to the occurrence of a primary crystallization reaction that yields a microstructure consisting of uniformly dispersed Al-nanocrystals embedded in an amorphous matrix. Rapidly solidified Al-alloys ribbons containing 8 at.% Ni and 4-6 at.% La were prepared by single roller melt-spinning technique. As-melt-spun and annealed ribbons were investigated by means of differential scanning calorimetry ( DSC), X-ray diffractometry ( XRD) and hardness measurements. XRD studies revealed that ribbons are fully amorphous in the as-melt-spun state. DSC studies showed that crystallization proceeds in two or three stages that are sensitively influenced by La content. Crystallizations kinetics were analysed by Kissinger and Johnson-Mehl-Avrami approaches. Microhardness of all the ribbons was examined at different temperatures and correlated with the corresponding structural evolution.
|Official URL/DOI:||DOI: 10.1080/10426910701236007|
|Uncontrolled Keywords:||activation energy; Al-based amorphous alloy; crystallization; differential scanning calorimetry; microhardness|
|Divisions:||Metal Extraction and Forming|
Material Science and Technology
|Deposited By:||INVALID USER|
|Deposited On:||18 Jul 2011 12:42|
|Last Modified:||08 Feb 2012 17:05|
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