NDLI: An Analysis on Microstructure and Grain Size of Molybdenum Powder Material Processed by Equal Channel Angular Pressing

Content Provider	Springer Nature Link
Author	Wang, Xue Li, Ping Xue, Kemin
Copyright Year	2015
Abstract	Pure molybdenum powder with a body center cubic lattice was processed by equal channel angular pressing (ECAP) for multi-pass at a processing temperature of 673 K, and subsequently, tests of relative density and Vickers microhardness were followed after processing. Additionally, the x-ray diffraction (XRD) was employed to analyze the crystallite size and dislocation density for both as-received powder and ECAP-processed samples. Electron backscatter diffraction (EBSD) was performed to characterize the grain structure and texture for the ECAP-processed samples. The results show that through processing by ECAP, bulk molybdenum sample with ultrafine-grained microstructure was achieved with the relative density of 0.93, the Vickers microhardness of 355 Hv, and the mean grain size of 0.24 μm. XRD profiles based on integral breadth method indicate that the crystallite size and dislocation density in the initial powder are 63.0 nm and 8.45E13 m$^{−2}$, respectively. After ECAP processing, the crystallite size decreases gradually from 52.7 to 39.1 nm and the dislocation density increases from 3.82E14 to 4.00E14 m$^{−2}$ after 1 and 2 passes. EBSD measurements show the significant grain refinement after 2 passes of ECAP. Therefore, grain refinement strengthening and dislocation tangling are likely to contribute to the increase of microhardness. The narrow range of grain size distribution after 2 passes of ECAP and the decrease of non-uniformity coefficient of microhardness both indicate the enhanced homogeneity compared with samples after 1 pass. The XRD profiles as well as inverse pole figures reveal that a texture of {110} <111> was developed through processing by ECAP.
Starting Page	4510
Ending Page	4517
Page Count	8
File Format	PDF
ISSN	10599495
Journal	Journal of Materials Engineering and Performance
Volume Number	24
Issue Number	11
e-ISSN	15441024
Language	English
Publisher	Springer US
Publisher Date	2015-09-23
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	crystallite size dislocation density equal channel angular pressing (ECAP) microstructure molybdenum powder material 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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