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Characterization of Al2O3 in High-Strength Mo Alloy Sheets by High-Resolution Transmission Electron Microscopy

Published online by Cambridge University Press:  25 February 2016

Yucheng Zhou ,
Yimin Gao ,
Shizhong Wei  and
Yajie Hu
Yucheng Zhou*
Affiliation:
State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, China
Yimin Gao
Affiliation:
State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, China
Shizhong Wei
Affiliation:
Henan Engineering Research Center for Wear of Materials, Henan University of Science & Technology, Luoyang 471003, China
Yajie Hu
Affiliation:
Henan Engineering Research Center for Wear of Materials, Henan University of Science & Technology, Luoyang 471003, China
*
*Corresponding author. [email protected]
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Abstract

A novel type of alumina (Al2O3)-doped molybdenum (Mo) alloy sheet was prepared by a hydrothermal method and a subsequent powder metallurgy process. Then the characterization of α-Al2O3 was investigated using high-resolution transmission electron microscopy as the research focus. The tensile strength of the Al2O3-doped Mo sheet is 43–85% higher than that of the pure Mo sheet, a very obvious reinforcement effect. The sub-micron and nanometer-scale Al2O3 particles can increase the recrystallization temperature by hindering grain boundary migration and improve the tensile strength by effectively blocking the motion of the dislocations. The Al2O3 particles have a good bond with the Mo matrix and there exists an amorphous transition layer at the interface between Al2O3 particles and the Mo matrix in the as-rolled sheet. The sub-structure of α-Al2O3 is characterized by a number of nanograins in the $\left[ {2\bar{2}1} \right]$ direction. Lastly, a new computer-based method for indexing diffraction patterns of the hexagonal system is introduced, with 16 types of diffraction patterns of α-Al2O3 indexed.

Keywords

doped Mo sheetaluminainterfacehydrothermal methodHRTEM
Type
Materials Applications
Information
Microscopy and Microanalysis , Volume 22 , Issue 1 , February 2016 , pp. 122 - 130
Copyright
© Microscopy Society of America 2016 

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