研究目的
Investigating the effects of crystallographic orientation and negative rake angle on the brittle-ductile transition and subsurface deformation in machining of monocrystalline germanium.
研究成果
The negative rake angle and crystallographic orientation significantly affect the brittle-ductile transition and subsurface deformation in machining monocrystalline germanium. Large negative rake angles alter initial surface crack patterns and the anisotropy in critical depth for ductile-brittle transition. Cutting orientations influence the thickness of the amorphous deformed layer.
研究不足
The study focuses on monocrystalline germanium and may not be directly applicable to other materials. The effects of other machining parameters like cutting speed and tool wear were not investigated.
1：Experimental Design and Method Selection:
Taper cutting experiments were conducted using a diamond tool to investigate the effects of negative rake angle and cutting orientation on monocrystalline germanium. Confocal laser scanning microscopy and Raman spectroscopy were used for observation and characterization.
2：Sample Selection and Data Sources:
Monocrystalline germanium samples were cut on the (100), (101), and (111) planes with different cutting orientations.
3：List of Experimental Equipment and Materials:
Diamond tool, confocal laser scanning microscope (Model: LEXT OSL4000, Olympus Corporation, Japan), laser Raman micro spectrometer (Model: DXR Raman Microscope, Thermo Fisher Scientific Inc., USA).
4：Experimental Procedures and Operational Workflow:
Taper cutting was performed with rake angles of -30° and -60° on all specified orientations. The surface topographies and subsurface deformation were observed and characterized.
5：Data Analysis Methods:
The critical undeformed chip thickness (UCT) was determined based on groove width measurements and Raman spectroscopy was used to analyze subsurface deformation.
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