Da-tong ZHANG's research while affiliated with South China University of Technology and other places
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Publications (14)
The evolution of the 3D Fe-rich phases of Al–7.0Si–1.2Fe alloys with different Mn contents was visualized and characterized using synchrotron X-ray computed tomography, and the effect of Fe-rich phases with typical morphologies on the fracture behavior during tensile testing was analyzed. The results showed that the Fe-rich phase changed from plate...
Effect of Si and Ti on dynamic recrystallization (DRX) of Cu−15Ni−8Sn alloy was studied using hot compression tests over deformation temperature range of 750−950 °C and strain rate range of 0.001−10 s⁻¹. The results show that the dynamic recrystallization behavior during hot deformation is significantly affected by the trace elements of Si and Ti....
A self-developed double-nozzle gas atomization technique was used to produce AlSi10Mg powder. Effects of delivery tube diameter, gas pressure, and melt superheat on powder characteristics were investigated. The concepts of bluntness and outgrowth were introduced to analyze powder sphericity and satellite index quantitatively. The results showed tha...
Al–5.0Cu–0.4Mn alloys with different Zr additions have been prepared by direct squeeze casting. The effects of Zr on microstructures and mechanical properties of the as-cast and T6 heat-treated alloys were investigated by tensile test, optical microscope (OM), scanning electron microscope (SEM) and transmission electron microscope (TEM). The result...
Gravity die casting (GC) and squeeze casting (SC) T4-treated Al–7.0Zn–2.5Mg–2.1Cu alloys were employed to investigate the microstructures, mechanical properties and low cycle fatigue (LCF) behavior. The results show that mechanical properties of SC specimens are significantly better than those of GC specimens due to less cast defects and smaller se...
Mg-3.99Y-3.81Nd-0.53Zr (WE43) casting alloy was subjected to single-pass friction stir processing (FSP) at a constant processing speed of 60 mm·min−1 and various rotation speeds of 400, 800, 1200, and 1500 r·min−1, and microstructures and mechanical properties of the experimental materials were investigated. FSP results in the generation of fine-gr...
The effects of Mn content on the microstructures and mechanical properties of squeeze cast Al-5.0Cu-0.5Fe alloys at different applied pressures were examined by tensile test, optical microscopy, scanning electron microscopy and image analysis. The results show that the needle-like β-Fe phase (Al7Cu2Fe) is completely converted to the Chinese script...
Normal and submerged friction stir processing (SFSP) were applied to prepare fine-grained AZ91 alloy, and microstructure and mechanical properties of the processed materials were investigated. The results show that owing to cooling water, the stir zone (SZ) area of SFSP is smaller than that of normal FSP, and microstructures are significantly refin...
The dissimilar friction stir welding of pure copper/1350 aluminum alloy sheet with a thickness of 3 mm was investigated. Most of the rotating pin was inserted into the aluminum alloy side through a pin-off technique, and sound welds were obtained at a rotation speed of 1000 r/min and a welding speed of 80 mm/min. Complicated microstructure was form...
Microstructure and tensile behaviors of AZ31 magnesium alloy prepared by friction stir processing (FSP) were investigated. The results show that microstructure of the AZ31 hot-rolled plate with an average grain size of 92.0 μm is refined to 11.4 μm after FSP. The FSP AZ31 alloy exhibits excellent plasticity at elevated temperature, with an elongati...
Accumulative roll-bonding (ARB) was applied to Mg-Al-Zn magnesium alloy sheets to prepare ultrafine-grain microstructure. Significant grain refinement is achieved after three cycles of ARB with average grain size of about 1.3 μm. The microstructure is characterized by nearly uniform ultrafine equiaxed microstructure without twins. The evolution of...
Dissimilar friction stir welding between 5052 Al alloy and AZ31 Mg alloy with the plate thickness of 6 mm was investigated. Sound weld was obtained at rotation speed of 600 r/min and welding speed of 40 mm/min. Compared with the base materials, the microstructure of the stir zone is greatly refined. Complex flow pattern characterized by intercalati...
The effect of heat treatment on the microstructure and properties of a hot-extruded nickel-aluminum bronze was investigated. Experimental materials were heat treated through different processes, including quenching, normalizing, aging and annealing, and their microstructure, corrosion resistance and mechanical properties were characterized. It is f...
A new high-strength aluminum alloy with better fluidity than that of ZL205A was developed. The effect of applied pressure during squeeze casting on microstructures and properties of the alloy was studied. The results show that the fluidity of the alloy is 16% and 21% higher than that of ZL205A at the pouring temperature of 993 K and 1 013 K, respec...
Citations
... The detailed processing parameters are found in Refs. [44,45]. ...
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... Zhao et al. performed hot deformation experiments on Cu-15Ni-8Sn alloys at deformation temperatures between 825 • C and 925 • C and strain rates of 0.0001-0.6 s −1 . It was found that Si and Ti promoted the dynamic recrystallization nucleation of the Cu-15Ni-8Sn alloys, and Ni 16 Si 7 Ti 6 particles precipitated, inhibiting the growth of recrystallized grains [18]. Niu compared three models of deformation (the Arrhenius model, the Johnson-Cook model, and the Zerilli-Armstrong model) and found that the Arrhenius model had the highest accuracy with a calculated hot deformation activation energy of 310 kJ/mol for the Cu-15Ni-8Sn alloy [19]. ...
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... There is an increased demand for high-quality metallic powders used for additive manufacturing, such as in the aerospace, automotive, and medical fields and other applications [1]; this results in particular requirements for the production of spherical metal powders with narrow size distribution [2]. Various methods can prepare powder particles, including mechanical crushing, ball milling, gas atomization, electrolysis, and oxidation [3]. ...
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... The combined addition of Sc, Er and Zr was also proposed in literature to improve the structural properties of Al-Si casting alloys [13,[26][27][28], typically heat treated in a conventional way (SHT + aging). Complementary effects were reported for these minor additions: Zr acts as grain refiner and inoculant [11,29,30] while Er, together with Sc and other rare-earth elements, have modifying effects on eutectic Si, similarly to the widely diffused but more volatile Sr [31][32][33]. ...
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... However, aluminum machined chips are in attraction for improved response to isothermal heat treatment [9]. This has been reported by the researchers that during the gravity die casting processing of wrought aluminum alloys, applied pressure provides high strength against the impact load conditions and fatigue for the shaped components [10][11][12]. The influence of high compaction on the 6061 aluminum alloy was reported in the investigation [13], in which the effect of fine grains on the cast alloy was shown for fatigue and deformation behavior. ...
... Except for Al2Cu coarse particles, Al7Cu2Fe or Al7Cu2(Fe, Mn) impurity intermetallics may also be observed in 2219 aluminum alloy. The form of the Fe-rich intermetallic phase is related to composition of the alloys, cooling rate, and processing method, which has a similar influence on Al2Cu eutectic phase [11][12][13][14]. According to the results of our ongoing research, the impurity Fe-rich particles are not dissolved into α-Al matrix and can also act as crack initiation sites during deformation, which is to further deteriorate the mechanical properties. ...
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... 8,9 The alloying process of Mg with RE enhances the wear and corrosion resistances significantly, which, in turn, rendered those alloys' potential candidates as biomaterials. 10 As known, the low wear rate slows down the dissolution, which, in turn, enables the control of the biodegradation rate. 11 Thus, the hydrogen gas (H + ) release rate, which occurs with the reactions of Mg ions in the body, will slow down. ...
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... The process is used to join materials that are similar and dissimilar. In the nuclear, aerospace, electrical, and electronics industries, joints made of different materials are used for weight & cost reduction and improvement in productivity [1,5,6,9,13,14]. Copper and aluminum has good corrosion resistance, mechanical properties, heat and electrical conductivities [17,27]. ...
... Therefore, hot extrusion was chosen to deform NAB alloy in this paper. Some studies [17,36] have reported the effects of hot extrusion on the microstructure and mechanical properties of NAB. However, there are few studies on the improvement of the erosion-corrosion resistance of NAB by hot extrusion, and the corrosion mechanism has not been revealed. ...
... This method is shown in Fig. 9b [140]. The SPD techniques such as accumulative roll bonding (ARB) [141], ECAP [142][143][144][145], FSP [122,[146][147][148], high pressure torsion (HPT) [149], and multidirectional forging (MDF) [150,151] have been extensively used to study the superplasticity of the AZ31 alloy. For instance, ARB of a homogenized AZ31 alloy with an average grain size of 22 µm has been reported [141]. ...
