Fabrication of High-Content Ti3AlC2 Powders by Mechanical Alloying

Author(s):  
Chen Yang ◽  
Song Zhe Jin ◽  
Cheng Yu Xu ◽  
Shu Sheng Jia
Keyword(s):  
Author(s):  
T. E. Mitchell ◽  
P. B. Desch ◽  
R. B. Schwarz

Al3Zr has the highest melting temperature (1580°C) among the tri-aluminide intermetal1ics. When prepared by casting, Al3Zr forms in the tetragonal DO23 structure but by rapid quenching or by mechanical alloying (MA) it can also be prepared in the metastable cubic L12 structure. The L12 structure can be stabilized to at least 1300°C by the addition of copper and other elements. We report a TEM study of the microstructure of bulk Al5CuZr2 prepared by hot pressing mechanically alloyed powder.MA was performed in a Spex 800 mixer using a hardened steel container and balls and adding hexane as a surfactant. Between 1.4 and 2.4 wt.% of the hexane decomposed during MA and was incorporated into the alloy. The mechanically alloyed powders were degassed in vacuum at 900°C. They were compacted in a ram press at 900°C into fully dense samples having Vickers hardness of 1025. TEM specimens were prepared by mechanical grinding followed by ion milling at 120 K. TEM was performed on a Philips CM30 at 300kV.


2019 ◽  
Vol 107 (2) ◽  
pp. 207 ◽  
Author(s):  
Jaroslav Čech ◽  
Petr Haušild ◽  
Miroslav Karlík ◽  
Veronika Kadlecová ◽  
Jiří Čapek ◽  
...  

FeAl20Si20 (wt.%) powders prepared by mechanical alloying from different initial feedstock materials (Fe, Al, Si, FeAl27) were investigated in this study. Scanning electron microscopy, X-ray diffraction and nanoindentation techniques were used to analyze microstructure, phase composition and mechanical properties (hardness and Young’s modulus). Finite element model was developed to account for the decrease in measured values of mechanical properties of powder particles with increasing penetration depth caused by surrounding soft resin used for embedding powder particles. Progressive homogenization of the powders’ microstructure and an increase of hardness and Young’s modulus with milling time were observed and the time for complete homogenization was estimated.


Author(s):  
paola baia ◽  
Diego Jorge Alves Borges ◽  
Danyella Crystyane Silva Cardoso ◽  
Victor Ferreira ◽  
Paulo Assunção ◽  
...  

2016 ◽  
Vol 58 (4) ◽  
pp. 337-342
Author(s):  
S. Osman Yilmaz ◽  
Tanju Teker ◽  
Fatih Demir

Sign in / Sign up

Export Citation Format

Share Document