A5101631328- Metal and Thin Film Mechanics
- Diamond and Carbon-based Materials Research
- Semiconductor Quantum Structures and Devices
- Nanowire Synthesis and Applications
- Advanced Surface Polishing Techniques
- Integrated Circuits and Semiconductor Failure Analysis
- Metallurgy and Material Forming
- GaN-based semiconductor devices and materials
- High Temperature Alloys and Creep
- Force Microscopy Techniques and Applications
- Lanthanide and Transition Metal Complexes
- Near-Field Optical Microscopy
- Mechanical Failure Analysis and Simulation
- Anodic Oxide Films and Nanostructures
- Glass properties and applications
- Crystallization and Solubility Studies
- Magnetic Properties and Applications
- Microstructure and mechanical properties
- Metal Alloys Wear and Properties
- Numerical methods in engineering
- Fatigue and fracture mechanics
- Metal Forming Simulation Techniques
- Aluminum Alloys Composites Properties
- Microstructure and Mechanical Properties of Steels
- Magnetic properties of thin films
Anhui University of Technology
2010-2024
Jilin University
2011-2021
Weihai Science and Technology Bureau
2020
University of Shanghai for Science and Technology
2012
Beihang University
2012
Saitama University
2009-2011
Jiuquan Iron & Steel (China)
2009
Nanoindentations of monocrystalline silicon are conducted to investigate the phase transformation process at a temperature range from 292 K 210 K. The load-displacement curves obtained and residual indents detected by Raman spectra. MD simulations also identify state during nanoindentation. results show that low has no influence on generation Si-II loading indentation, but phenomenon pop-out is inhibited with decreasing. probability occurrence dramatic drop 260 230 Both propagation...
In situ nanomechanical tests provide a unique insight into mechanical behaviors of materials, such as fracture onset and crack propagation, shear band formation so on. This paper presents novel in nanoindentation device with dimensions 103mm×74mm×60mm. Integrating the stepper motor, piezoelectric actuator flexure hinge, can realize coarse adjustment specimen precision loading unloading indenter automatically. A holder was designed to guarantee that penetrates withdraws from surface...
A cobalt nanoplate array (Co NPA) directly grown on a copper substrate by the one-step electrodeposition method is synthesized without any template. Most of nanoplates with height ∼350 nm and length up to several micrometers stand vertically substrate. The as-prepared have {100} crystal facets as basal plane. By adjusting electroplating conditions, morphology size nanocrystal can be modulated. Owing interesting anisotropic nanostructures, remarkable magnetic anisotropy obtained Co NPA. In...
In reality, it is a common phenomenon to perform nanoindentation test while the indenter not perpendicular sample, which would cause properties such as hardness and elastic modulus of sample be somehow different from true values. this paper, effects tilt on results were studied by finite element analysis (FEA) simulation. The compared with perpendicularly penetrating into flat surface. Conclusions show that when penetrates specimen, projected contact area varies widely. indentation could...
The grain orientation is represented by distribution function through the volume fraction in case of discrete oriented grains, and we propose an average method to evaluate residual stress polycrystalline ferroelectric thin film from mesomechanics continuum mechanics. In order verify method’s validity, x-ray diffraction patterns previous films with random preferred are chosen as samples surface stresses, they compared stresses evaluated conventional extended sin2 ψ methods. Furthermore,...
In this research, the mechanical behavior of undoped n-type GaAs was investigated by nanoindentation experiments using two types indenters-Berkovich and flat-tip-with force applied up to 1000 mN. From measured force-depth curves, an obvious pop-in phenomenon occurred at 150 mN with flat-tip indenter representing elastic-plastic transition. The Young's modulus hardness were calculated be 60-115 GPa 6-10 GPa, respectively, under Berkovich indenter. Based on observation indent imprints,...
In order to study the high-cycle and very-high-cycle fatigue performance of aero-engine blade materials under conditions close their real service, an in situ testing apparatus for coupling high-temperature combined mechanical loads (HTCMFTA) has been developed. The main functions includes: static loading, ultrasonic (up 20 kHz) field 1100°C) building, monitoring. A series tests on compressor material Ti-6Al-4V alloy were carried out with apparatus. results show that can accurately simulate...
Dissimilar friction stir welding (FSW) of 2205 duplex stainless steel (2205 DSS) and 304 austenitic (304 ASS) is carried out with various parameters. The effect material position tool offset on flow mixing, the microstructure, mechanical properties joints are investigated, relationship between torque determined. With to retreating side (RS), defect‐free proper mixing fabricated. When ASS placed advancing (AS), better than case opposite position, but results in a larger stirring zone (SZ)...
Photoluminescence (PL) of InGaAs∕GaAs quantum dots (QDs) is found to be enhanced and then quenched by localized-strain effects induced the indentation a nanoprobe. By using nanoprobe with flat cylindrical apex 600nm in radius, quench individual fine PL peaks originating from single QDs was analyzed obtain relation between QD location relative force required PL. analyzing direct-to-indirect transition band lineup surrounding GaAs matrix through numerical simulation, authors concluded that...
The low-temperature (10 K) photoluminescence (PL) of self-assembled InGaAs/GaAs quantum dots (QDs) was measured under the elastic indentation a flat cylindrical nanoprobe that generates localized strain fields around itself. As force increases, intensity PL fine peak from single QD firstly followed by decrease, and is finally quenched. observed at which disappears, i.e., quenching varies to QD. This variation ascribed diversely distributed in each therefore can be related location with...
An improved ability to estimate locations of embedded InGaAs/GaAs quantum dots (QDs) was demonstrated by using a domed-apex probe measure low-temperature (10 K) photoluminescence (PL) during nanoprobe scan. Individual QDs subjected nanoprobe-induced strain exhibited enhanced fine PL peaks. emission results were used trace single the positions where their peak energies achieved maximum values.
Simultaneous measurement of the nanoprobe indentation force and photoluminescence InGaAs/GaAs quantum dots is successfully achieved by introducing a specially designed loadcell into system. By using this improved system, emission properties self-assembled (QDs) under cylindrical are investigated low temperature high vacuum conditions. Energy shifts as large 100 meV induced observed in QDs. Further, increase energy QDs varies from peak to same force. In order clarify mechanism, simulations...