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In-situ transmission electron microscopy investigation of compressive deformation in interphase-precipitated carbide-strengthened α-iron single-crystal nanopillars
- Source :
- Materials Science and Engineering: A. 746:406-415
- Publication Year :
- 2019
- Publisher :
- Elsevier BV, 2019.
-
Abstract
- Compressive deformation tests were carried out during in-situ transmission electron microscopy to investigate the deformation behaviors of α-iron nanopillars with or without interphase-precipitated carbides. Three kinds of α-iron nanopillars were prepared from titanium-molybdenum-free and titanium-molybdenum-containing steels: one interphase-precipitated carbide-free and two interphase-precipitated carbide-bearing pillars with carbides of different sizes (4.7 nm and 3.0 nm after holding at 700 °C and 650 °C, respectively) and different number densities. In-situ observation provided direct evidence that interphase-precipitated nanometer-sized carbides confined the movement of the dislocations, resulting in smaller strain bursts with a significantly higher strength, in contrast to the behaviors of the pillars without carbides. The individual strain bursts in the in-situ stress-strain curves, which were associated with the corresponding dislocation substructures in the three kinds of pillars, are discussed.
- Subjects :
- 010302 applied physics
Materials science
Strain (chemistry)
Mechanical Engineering
02 engineering and technology
021001 nanoscience & nanotechnology
Condensed Matter Physics
01 natural sciences
Carbide
Mechanics of Materials
Transmission electron microscopy
0103 physical sciences
General Materials Science
Interphase
Dislocation
Deformation (engineering)
Composite material
0210 nano-technology
Single crystal
Nanopillar
Subjects
Details
- ISSN :
- 09215093
- Volume :
- 746
- Database :
- OpenAIRE
- Journal :
- Materials Science and Engineering: A
- Accession number :
- edsair.doi...........19ee5d506cc004f1750e1d88591de0b4