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| 1 | Friction stir based welding and processing technologies-processes,parameters,microstructures and applications:A review显示文摘Friction stir welding(FSW) has achieved remarkable success in the joining and processing of aluminium alloys and other softer structural alloys. Conventional FSW, however, has not been entirely successful in the joining, processing and manufacturing of different desired materials essential to meet the sophisticated green globe requirements. Through the efforts of improving the process and transferring the existing friction stir knowledge base to other advanced applications, several friction stir based daughter technologies have emerged over the timeline. A few among these technologies are well developed while others are under the process of emergence. Beginning with a broad classification of the scattered frictions stir based technologies into two categories, welding and processing, it appears now time to know,compile and review these to enable their rapid access for reference and academia. In this review article,the friction stir based technologies classified under the category of welding are those applied for joining of materials while the remnant are labeled as friction stir processing(FSP) technologies. This review article presents an overview of four general aspects of both the developed and the developing friction stir based technologies, their associated process parameters, metallurgical features of their products and their feasibility and application to various materials. The lesser known and emerging technologies have been emphasized. | G.K.Padhy C.S.Wu S.Gao | 2018 | Journal of Materials Science & Technology2018，34，1： | 65 |
| 2 | INFLUENCE OF SO_4^(2-) AND Cl-ON THE CORROSION BEHAVIOR OF COPPER TUBE IN AIR-CONDITIONING SYSTEM显示文摘The influence of chloride or sulphur dioxide on the corrosion behavior of copper tube in the air-conditioning system was studied using scanning electron microscope (SEM),energy dispersion spectrometer (EDS) and cyclic polarization techniques.The results showed that the corrosion of copper tube are mainly caused by the SO4^2- and Cl^- ions in the circulating water,and the former is mainly responsible for the general corrosion of the copper tube whilst the latter for the pitting corrosion.The different influences of SO4^2- and Cl^- ions on the corrosion type of copper tube may be attributed to that the radius of SO4^2- ion is much larger than that of Cl^- ion. Meanwhile the results also indicated that SO4^2- inhibits the pitting corrosion caused by Cl^- and Cl^- inhibits the general corrosion initiated by SO4^2- due to their competitive adsorption on the copper matrix. | C.S.Wu Z.Zhang F.H.Cao J.Q.Zhang J.M.Wang C.N.Cao | 2004 | Acta Metallurgica Sinica(English Letters)2004，17，1： | 1 |
| 3 | Experimental test of parity conservation in beta decay显示文摘 | C.S.Wu E.Ambler R.W.Hayward D.D.Hoppes R.P.Hudson | | 0，，04： | 1 |
| 4 | In situ DRIFTS study of photocatalytic CO_(2) reduction under UV irradiation显示文摘Photocatalytic reduction of CO_(2) on TiO_(2) and Cu/TiO_(2) photocatalysts was studied by in situ diffuse reflectance infrared Fourier transform spectroscopy(DRIFTS)under UV irradiation.The photocatalysts were prepared by sol-gel method via controlled hydrolysis of titanium(IV)butoxide.Copper precursor was loaded onto TiO_(2) during sol-gel procedure.A large amount of adsorbed H_(2)O and surface OH groups was detected at 25℃on the TiO_(2) photocatalyst after being treated at 500℃under air stream.Carbonate and bicarbonate were formed rapidly due to the reaction of CO_(2) with oxygen-vacancy and OH groups,respectively,on TiO_(2) surface upon CO_(2)adsorption.The IR spectra indicated that,under UV irradiation,gas-phase CO_(2) further combined with oxygen-vacancy and OH groups to produce more carbonate or bicarbonate.The weak signals of reaction intermediates were found on the IR spectra,which were due to the slow photocatalytic CO_(2) reduction on photocatalysts.Photogenerated electrons merge with H^(+)ions to form H atoms,which progressively reduce CO_(2) to form formic acid,dioxymethylene,formaldehyde and methoxy as observed in the IR spectra.The well-dispersed Cu,acting as the active site significantly increases the amount of formaldehyde and dioxymethylene,thus promotes the photoactivity of CO_(2) reduction on Cu/TiO_(2).A possible mechanism of the photocatalytic CO_(2) reduction is proposed based on these intermediates and products on the photocatalysts. | Jeffrey C.S.WU Chao-Wei HUANG | 2010 | Frontiers of Chemical Science and Engineering2010，4，2： | 0 |
| 5 | ELECTROCHEMICAL NOISE ANALYSIS OF THE INFLUENCE OF THE Zn^(2+)IONS CONCENTRATION ON ZINC ELECTROPLATING显示文摘The influence of the concentration of Zn2+ ions on zinc electroplating process was investigated by means of electrochemical noise (EN) and cyclic voltammetry methods in conjunction with the scanning electron microscopy (SEM) technique. It was found that the EN generated during the electroplating of dentritic or large polymeric zinc deposit has large potential oscillation amplitude and positive potential drift while the compact zinc deposit possesses small noise amplitude and little potential drift. With the change of rate determining step from diffusion-control through mixed-control to activation-control, the maximum relative energy obtained from wavelet analysis defined from the region with larger scales to those with smaller scales, and the EDP (relative energy distribution plot) can be us, as 'fingerprints' of EN to characterize the electroplating process and the deposit structure. The results also showed that electrochemical noise technique can give more information about the electrodeposit structure than other normal electrochemical measurements, such as linear potential sweep method and cyclic voltammetry technique. | Z.Zhang C.S.Wu Q.Y.Cai F.H.Cao J.Q.Zhang | 2005 | Acta Metallurgica Sinica(English Letters)2005，18，2： | 0 |
| 6 | STUDY THE INFLUENCE OF H_(3)BO_(3)ON THE ZINC ELECTROPLATING USING ELECTROCHEMICAL NOISE TECHNIQUE显示文摘The influence of H3BO3 on the zinc electroplating was studied using electrochemical noise technique, cyclic voltammetry and steady-state polarization method. The results showed that, under the experimental conditions, the deposition of zinc followed the mechanism of two-dimensional nucleation and subsequent grain growth. The addition of H3BO3 into the electroplating solution prominently changes the nucleation and growth kinetics of zinc deposits, which is directly related to the features of electrocrystallization noise and the corresponding structure of the electrodeposits. The results also shown that the electrochemical noise (EN) technique can give more information about the electrodeposits structure and electroplating mechanism than other normal electrochemical measurements can give, such as steady-state polarization method and cyclic voltammetry technique. | Z.Zhang C.S.Wu Q.Y.Cai Y.L.Cheng F.H.Cao J.Q.Zhang C.N.Cao | 2004 | Acta Metallurgica Sinica(English Letters)2004，17，5： | 0 |
| 7 | Microstructure and Mechanical Properties of Dissimilar Double-Side Friction Stir Welds Between Medium-Thick 6061-T6 Aluminum and Pure Copper Plates显示文摘It is difficult to achieve Al/Cu dissimilar welds with good mechanical properties for medium-thick plates due to the inherent high heat generation rate at the shoulder-workpiece contact interface in conventional friction stir welding.Thus,doubleside friction stir welding is innovatively applied to join 12-mm medium-thick 6061-T6 aluminum alloy and pure copper dissimilar plates,and the effect of welding speeds on the joint microstructure and mechanical properties of Al/Cu welds is systematically analyzed.It reveals that a sound Al/Cu joint without macroscopic defects can be achieved when the welding speed is lower than 180 mm/min,while a nonuniform relatively thick intermetallic compound(IMC)layer is formed at the Al/Cu interface,resulting in lots of local microcracks within the first-pass weld under the plunging force of the tool during friction stir welding of the second-pass,and seriously deteriorates the mechanical properties of the joint.With the increase of welding speed to more than 300 mm/min void defects appear in the joint,but the joint properties are still better than the welds performed at low welding speed conditions since a continuous uniform thin IMCs layer is formed at the Al/Cu interface.The maximum tensile strength and elongation of Al/Cu weld are,respectively,135.11 MPa and 6.06%,which is achieved at the welding speed of 400 mm/min.In addition,due to the influence of welding distortion of the first-pass weld,the secondpass weld is more prone to form void defects than the first-pass weld when the same plunge depth is applied on both sides.The double-side friction stir welding is proved to be a good method for dissimilar welding of medium-thick Al/Cu plates. | J.X.Tang L.Shi C.S.Wu M.X.Wu S.Gao | 2022 | Acta Metallurgica Sinica(English Letters)2022，35，12： | 0 |
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