NDLI: Effects of Micro and Macroalloying on the Formation and Thermal Stability of Nanocrystalline L1$_{2}$-Al$

Content Provider	Springer Nature Link
Author	Anvari, S. Z. Yazdian, N. Karimzadeh, F. Enayati, M. H.
Copyright Year	2014
Abstract	Structural modification of nanocrystalline trialuminde Al$_{3}$V by microalloying with Ti and macroalloying with Zr was studied. For micro and macroalloying, the Al$_{75}$(V$_{ x }$Ti$_{1−x }$) x = 0-25 and Al$_{5}$ZrV$_{2}$ were synthesized by mechanical alloying of elemental blends of the nominal composition. The structural changes of powder particles during mechanical alloying were investigated by x-ray diffraction patterns. Microstructure of powders was characterized by scanning electron microscopy and the hardness of powder particles was determined by Vickers microhardness measurement. It was found that microalloying of trialuminides by Ti led to the formation of Al$_{3}$(V,Ti) with stable tetragonal structure (DO$_{22}$) in different amounts of Ti after 40 h milling. Thermodynamic calculations, which were based on Miedema model, showed that the higher negative formation enthalpy of intermetallics in Al-V-Ti system induced refinement of trialuminides. In addition, it was found that the hardness of compounds was increased by enhancement of Ti in trialuminide composition. For Al$_{5}$V$_{2}$Zr compound, the metastable L1$_{2}$ phase was formed after 20 h milling. Thermal analysis of the synthesized compound showed an exothermic peak around 550 °C, which was related to the partial transition of L1$_{2}$ structure to DO$_{22}$. Moreover, ordering of L1$_{2}$ phase took place due to increasing temperature.
Starting Page	1173
Ending Page	1181
Page Count	9
File Format	PDF
ISSN	10599495
Journal	Journal of Materials Engineering and Performance
Volume Number	23
Issue Number	4
e-ISSN	15441024
Language	English
Publisher	Springer US
Publisher Date	2014-01-18
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	intermetallic compounds phase transitions powder metallurgy thermodynamic properties Characterization and Evaluation of Materials Tribology, Corrosion and Coatings Quality Control, Reliability, Safety and Risk Engineering Design
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Materials Science Mechanical Engineering

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