About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
|
Mechanical Behavior at the Nanoscale VII
|
Presentation Title |
D-31: Exploring Plasticity and Size Effects in Diamond-structured Semiconductors at Micro-scales Using Micromechanics |
Author(s) |
Ming Chen, Jeffrey M. Wheeler , Ralph Spolenak |
On-Site Speaker (Planned) |
Ming Chen |
Abstract Scope |
Semiconductors are routinely used in a wide variety of microelectromechanical systems (MEMS), as well as functional semiconductor components in micro-devices. Previous investigations of plastic deformation in these apparently brittle materials, e.g. diamond, silicon and germanium, have been achieved by macro-scale testing at high temperatures above brittle-to-ductile transition. This left a large gap in the knowledge of the plasticity and strength of semiconductors, especially at relatively low temperatures. We study temperature-dependent plasticity and size- dependent strength of these brittle semiconductors via in situ microcompression of pillars inside scanning electron microscope (SEM). We present an overview of deformation mechanisms and corresponding dislocation transitions in diamond-structured crystals from cryogenic to high temperatures; we also present size effects in these covalent semiconductors which possess high Peierls’ stresses in comparison with metallic and ionic crystals investigated in the literature. |
Proceedings Inclusion? |
Planned: |
Keywords |
Mechanical Properties, Nanotechnology, |