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Publications (42)
The 6005A-T5 aluminum alloy welded joints were prepared by use of friction stir welding (FSW) and metal inert gas welding (MIG). The difference in microstructure and mechanical properties of the two types of welded joints were investigated by optical microscopy (OM), scanning electron microscopy (SEM), transmission electron microscope (TEM), Vicker...
7055 aluminum alloy plates with the same size were rolled by two processes: small percentage reduction per pass (PRPP) and large percentage reduction per pass, respectively. Meanwhile, the effect of PRPP on the precipitates and corrosion resistance of 7055 aluminum alloy plate was investigated. The mechanisms were analyzed and discussed by optical...
Continuous, discontinuous, double-pass and multi-pass hot isothermal compression tests were conducted to understand the mechanical behavior and microstructure evolution of the Al-2.5Cu-1.58Li-0.3Mn-0.12Zr-0.06Mg-0.05Ti (wt%) alloy. The tests were conducted at temperature of 420 °C and strain rates of 0.001, 0.1 and 10 s⁻¹ on Gleeble-1500. EBSD and...
The microstructure evolution and composition distribution of the industrially cast Al-Cu-Li alloy during single-step and tow-step homogenization were investigated by optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), X-ray diffraction (XRD) and differential scanning calorimetry (DSC). The results show...
Flow behavior and microstructure evolution of 2297 Al-Cu-Li alloy were investigated by isothermal compression tests conducted at the deformation temperature of 300-500°C and strain rates of 0.001-10s-1. The results demonstrate that the characteristics of stress-strain curves depended on the interaction of work hardening and dynamic softening. The t...
The flow behaviors of Al-Cu-Li alloy were investigated by isothermal hot compressive tests, which were carried out at the deformation temperature range of 300-500 ℃, and strain rate of 0.001-10 s-1. Microstructure evolution process was studied by TEM and EBSD analysis. The results show that flow curve can be divided into three stages: work hardenin...
2197 Al-Li alloy was thermo-mechanically treated, and the precipitation and growth of the T1 phase and the phase interface characteristics were studied. The microstructures of thermo-mechanical treated 2197 Al-Li alloy for under-aged and peak-aged states were observed by high resolution electron microscopy (HREM). The results show that during therm...
The flow behavior and microstructure evolution of Al-Li alloy were investigated by isothermal compression tests and TEM analysis. The results show that the hot plastic deformation of the alloy is heat activation process. The flow curve consists of work hardening, dynamic softening and stabilization stage, and it has obvious peak stress when the def...
The flow behavior of 2099 alloy was investigated by means of hot compression tests in the temperature range of 300–500 °C and strain rate range of 0.001–10 s−1. Processing maps were developed on the basis of the dynamic materials model (DMM). The results show that the flow stress increases with increasing strain rate and decreasing temperature. At...
The effects of deformation conditions on flow behaviors and microstructure evolution characteristics of 2099 alloy were investigated by hot compression tests, variance analysis and TEM technology. The results show that, the flow stress of 2099 alloy experiences two stages with the increase of strains, namely, the transition deformation stage and th...
A processing map based on dynamic material modeling of 2099 alloy was investigated by isothermal compression tests on a Gleeble-1500 machine. Microstructure characteristics of safety areas and instability areas in the temperature range of 300~500℃, strain rate of 0.001~10 s-1 of 2099 alloy were analyzed. And the optimized processing parameters were...
Constitutive analysis for hot working of 2099 aluminum-lithium (Al-Li) alloy was carried out employing friction and temperature corrected flow curves from isothermal hot compression test, in a wide range of temperatures 300∼500 °C, at strain rates 0.001∼10 s−1 and strains 0.1∼0.7. The effects of temperature and strain rate on hot deformation behavi...
Dynamic softening mechanism of 2099 alloy was investigated by isothermal compression tests, thermal activation parameters calculation and comparison, EBSD and TEM techniques. On the basis of Zener-Hollomon parameter (Z) and deformation temperature (T), combining thermal activation parameters and microstructures analysis, the softening mechanism of...
Isothermal compression tests in a wide range of temperatures (300–500 °C) and strain rates (0.001–10 s−1), were performed on 2099 alloy to reveal the hot deformation characteristics. In order to give a precise prediction of flow behavior, the obtained experimental data were modified by friction and temperature correction and then employed to derive...
The extrusion limit diagram was constructed using hot compression experiments combining with extrusion force limit diagram and temperature rise limit diagram, the equations of critical extrusion limit curves were given, and the extrusion tests were conducted to confirm the reliability of extrusion limit diagram. The results show that with the incre...
Multipass plain strain compression test of 7055 alloy was carried out on Gleeble 1500D thermomechanical simulator to study the effect of interval time on static softening behavior between two passes. Microstructural features of the alloy deformed with delay times varying from 0 to 180 s after achieving a reduction of ~52 % in the 13 stages was inve...
The multi-pass hot compression test of 7055 aluminum alloy was performed at different temperatures and then the samples were heat treated by T6 heat treatment. The compressed samples were analyzed by OM and TEM. The results reveal that the average aspect ratio of the grains in the specimens compressed first decreases and then increases, the disloca...
The microstructure evolution and composition distribution of as-cast and homogenized 2099 aluminum–lithium (Al–Li) alloy were studied by optical microscopy (OM), differential thermal analysis (DTA), scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), area and line scanning, X-ray diffraction (XRD), and Vickers microhardness te...
The hot compression tests of 7055 aluminum alloy were carried out on Gleeble1500D thermal-mechanical simulator according to designed rolling processes to simulate the multi-pass hot rolling process. The flow stress curve was obtained. The features about flow stress, hardness and microstructure of the samples deformed to various strain accompanied w...
the effect of different Mg/Si and Mn content on uniformity and consistence of anodic films of 6061 aluminum alloy was investigated by using hardness test, coating thickness test, optical microscopy (OM), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). The results show that when Mg/Si is in the vicinity of 1.73 and...
Effects of thermo-mechanical treatment on the mechanical properties and microstructure of 2197 alloy were studied through analyses of the mechanical properties by tensile tests and TEM observation of thermo-mechanical heat treated 2197 alloy plates of various states. Results show that the dominating precipitated phase of peak-aged 2197 alloy during...
The phase transformation and precipitation behavior of iron-rich phase of 6061 aluminum alloy during the homogenization were investigated by optical microscopy(OM), scanning electron microscopy(SEM), energy dispersive spectrum(EDS) and transmission electron microscopy (TEM). The results show that the element of Mn is directly involved in the phase...
Compression tests of the Al-Zn-Mg-Cu-Zr(7055) alloy were performed at various strains and temperatures from 300 to 450°C under
a constant strain rate between 10−2 s−1 and 1 s−1. Microstructures during hot deformation were studied by transmission electron microscopy (TEM). Dislocation density, dislocation
cells and subgrains of the deformed samples...
The effects of prestretching before aging on the precipitated phases and mechanical properties of Al-Cu-Mg-Ag alloy were studied. The results show that the prestretching before aging increases the peak hardness and tensile strength and increases the time of peak-ageing at 165°C. The main precipitated phases are Ω phase and θ' phase. The precipitati...
The isothermal compression of 7055 alloy was carried out at a Geeble-1500D simulator. According to the experimental results, a back-propagation (BP) neural network model of flow stress and a processing map were developed. The results indicate that the neural network can correctly reproduce the flow stress in the sampled data and it can also predict...
Compression tests were performed at temperatures from 350 to 450 °C with different strain rates of 1.0×10−2 and 1.0×10−1 s−1. The microstructures of deformed samples were investigated by electron backscatter diffraction (EBSD). Microstructure observations indicated that under present deformation conditions, fraction of new grains increases with the...
The hot deformation behavior and microstructures of Al-7055 commercial alloy were investigated by axisymmetric hot compression
at temperatures ranging from 300°C to 450°C and strain rates from 10−2 to 10 s−1, respectively. Microstructures of deformed 7055 alloy were investigated by transmission electron microscopy (TEM). The dependence
of peak stre...
Hot compression of 7050 aluminum alloy was performed on Gleeble 1500D thermo-mechanical simulator at 350°C and 450°C with a constant strain rate of 0.1 s−1 to different nominal strains of 0.1, 0.3 and 0.7. Microstructures of 7050 alloy under various compression conditions were observed by TEM to investigate the microstructure evolution process of t...
Dynamic recovery (DRV) and dynamic recrystallization (DRX) play important roles during thermomechanical processes of light metals and alloys because they have obvious influence on microstructure evolution and finally on the mechanical properties of the worked material. Hot compression tests of 7050 aluminum alloy was carried out on Gleeble1500D the...
Hot compression tests of 7050 aluminum alloy was carried out on Gleeble1500D thermo-mechanical simulator according to the designed rolling processes to simulate the multi-pass hot rolling process. The microstructural features of the samples deformed to a reduction of 80% under different cooling conditions were investigated by OM and TEM. The result...
The flow stress characteristics of the commercial Al-Zn-Mg-Cu-Zr alloy were analyzed by isothermal compression at 300 - 450°C and strain rate of 0. 01 - 10 s 1 with the Gleeble-1500 hot simulator. The results reveal that the flow stress is controlled by strain rate and deformation temperature, where the flow stress is increased with increasing in s...
Hot compression tests of 7075 aluminium alloy were operated on Gleeble-1500D thermal simulator at a constant strain rate of 1/s and a temperature from 300 to 400 °C. The microstructures of hot deformed alloy were observed by transmission electron microscopy to research the effect of temperature on microstructure evolution of 7075 Al alloy during ho...
Evolution of flow stress and microstructures of an Al-Zn-Mg series alloy during deformation at elevated temperatures and large ranges of strain rates have been investigated by isothermal compression testing on Gleeble 1500 thermomechanical simulator. The results showed that the flow stress exhibited a characteristic of peak stress followed by smoot...
The evolution of microstructural variables, including the densities of mobile dislocation, immobile dislocation at the cell interiors, immobile dislocation in the cell walls, as well as total dislocation density, of an Al-Mg-Si aluminum alloy during thermomechanical processing were simulated based on a three-internal-variables-model (3IVM) involvin...
The characters of semi-solid AZ91 magnesium alloy has been investigated under the different temperature, different shear rates and different cooling condition. Two cooling conditions are quenching in water and gravity casting in metal molds. Shear rates are changed from 110s-1 to 330s-1 in the experiments. Research results show that the shear rates...
The flow behavior and dynamic recovery and recrystallization, as well as microstructure evolution, of AA7005 aluminium alloy in hot compression were investigated. A hyperbolic sine relationship can satisfactorily correlate temperature and strain rate with flow stress through an Arrhenius term that involves thermal activation parameters during stead...
Microstructure evolution of an Al-Zn-Mg (AA7005) alloy during compression at elevated temperatures was investigated by compression on Gleeble 1500 dynamic materials test machine. TEM was employed to analyze the microstructures of the alloy and electron back scattering parttern (EBSP) was conducted to study the orientation differences between neighb...
The hot deformation behaviors of an 2091 Al-Li-Cu-Mg-Zr alloy have been investigated by high temperature isothermal compression testing. The material constants of the alloy, including deformation activation energy AH as 162.5 kj/mol, stress-level coefficient a as 0.039 7 mm2/N, stress exponential n as 2.647 and structural factor A as 2.74 × 1010 s-...
