Phase transition and plastic deformation mechanisms induced by self-rotating grinding of GaN single crystals
|Corresponding Author||Li，Chen; Li，Longqiu|
Despite being the most promising third-generation semiconductor materials, the deformation and removal mechanisms of gallium nitride (GaN) single crystals involved in the ultra-precision machining process are not well revealed and few investigations on the grinding of GaN crystals have been reported, which hinders the development of high-efficiency and ultra-precision manufacturing of GaN components. Self-rotating grinding tests of GaN crystals were performed, and the results indicated that abrasive size had a significant influence on the surface morphology and roughness, in comparison with wheel rotational speed and feed speed. As the abrasive size decreased from 18 μm to 1.6 μm, the brittle fracture-dominated surface gradually changed to a full-plastic surface without brittle fractures and cracks. An ultra-smooth surface with a roughness of 1 nm in Sa was acquired using #8000 grinding wheels and a spark-out time of 10 min, which indicated that the machining technology of “grinding instead of polishing” of GaN crystals was achieved in this work. The plastic deformation mechanism of GaN crystals induced by ultra-precision machining was investigated using a cross-sectional TEM method and MD simulation, and both experimental and simulation results indicated that the plastic deformation involved in the scratching process was caused by the formation of polycrystalline nanocrystals, high-angle lattice misorientations, and close-to-atomic-scale defects, including stacking faults, dislocations and serious lattice distortions, along with a small amount of amorphous and phase transitions. There was an obvious delamination phenomenon in the plastic deformation zone. This research enhances the understanding of the deformation and damage mechanisms of GaN crystals involved in the ultra-precision machining process and is of significance for achieving the high-efficiency and high-accuracy manufacturing of GaN components.
ESI Hot Papers ; ESI Highly Cited Papers ; ESI Highly Cited Papers
National Natural Science Foundation of China[52005134,51975154] ; China Postdoctoral Science Foun-dation[2020M670901] ; Heilongjiang Postdoctoral Fund[LBH-Z20016]
|WOS Research Area|
Engineering, Manufacturing ; Engineering, Mechanical
|WOS Accession No|
|EI Accession Number|
Cubic boron nitride ; Diamonds ; Efficiency ; Grinding (machining) ; Grinding wheels ; III-V semiconductors ; Industrial research ; Industrial robots ; Morphology ; Plastic deformation ; Precision engineering ; Single crystals ; Surface morphology ; Surface roughness ; Wide band gap semiconductors
|ESI Classification Code|
Gems:482.2.1 ; Machining Operations:604.2 ; Semiconducting Materials:712.1 ; Robot Applications:731.6 ; Ceramics:812.1 ; Engineering Research:901.3 ; Industrial Engineering:912.1 ; Production Engineering:913.1 ; Physical Properties of Gases, Liquids and Solids:931.2 ; Crystalline Solids:933.1 ; Materials Science:951
|ESI Research Field|
Cited Times [WOS]:73
|Document Type||Journal Article|
|Department||Department of Mechanical and Energy Engineering|
1.School of Mechatronics Engineering,Harbin Institute of Technology,Harbin,150001,China
2.Department of Mechanical and Energy Engineering,Southern University of Science and Technology,Shenzhen,518055,China
Li，Chen,Piao，Yinchuan,Meng，Binbin,et al. Phase transition and plastic deformation mechanisms induced by self-rotating grinding of GaN single crystals[J]. INTERNATIONAL JOURNAL OF MACHINE TOOLS & MANUFACTURE,2022,172.
Li，Chen,Piao，Yinchuan,Meng，Binbin,Hu，Yuxiu,Li，Longqiu,&Zhang，Feihu.(2022).Phase transition and plastic deformation mechanisms induced by self-rotating grinding of GaN single crystals.INTERNATIONAL JOURNAL OF MACHINE TOOLS & MANUFACTURE,172.
Li，Chen,et al."Phase transition and plastic deformation mechanisms induced by self-rotating grinding of GaN single crystals".INTERNATIONAL JOURNAL OF MACHINE TOOLS & MANUFACTURE 172(2022).
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