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| 1 | Microstructural Analysis of Ultrasonic Welded AA6061 by Electron Backscattered Diffraction显示文摘Ultrasonic welding can be used to join plastic and metal through high-frequency (more than 20 kHz) acoustic vibrations. Aluminium alloy is widely used in electronics, automotive and aerospace. The mechanical vibrations used during ultrasonic metal welding are introduced horizontally. During ultrasonic metal welding, a complex process is triggered involving static forces, oscillating shearing forces and a moderate temperature increase in the welding area. As the energy is introduced to the weld zone, there are three important phenomena occurring which are surface effect, volume effect and thermal effect. As it is known, microstructure is directly linked to the mechanical properties including fatigue resistance, fatigue life and fracture strength. So the microstructure analysis is important to evaluate the ultrasonically welded aluminium alloy’s properties. Also, mechanical properties of metal sheets, such as plastic anisotropy and formability, can be improved by a proper crystallographic texture control. That means the texture has great influence on the plastic anisotropy of the final recrystallized sheets. Optical microscopy (OM) can be used for showing the grain size and grain shape. However, to examine the relationship between mechanical behaviour and microstructure of the weldment, optical microscopy(OM) is not sufficient. OM cannot delineate a grain structure in the weld zone. The etched surface exhibited granularity at the micron level, but it was not clear if that reflected the grain structure. Electron backscatter diffraction (EBSD) in an SEM has become the most widely used technique for determination of microtexture. In this research, high-resolution electron backscatter diffraction is used to study the effects of the vibration on the evolution of microstructure in AA6061. The orientation image maps (OIM), polar figures (PF), and orientation distribution functions (ODF) of the samples are obtained. The characteristics of the crystallographic orientation, the grain structure and the grain boundary are analysed to find the effect of ultrasonic vibration on the microstructure and texture of the bond. The ultrasonic vibration will lead to exceptional refinement of grains to a micron level along the bond area and affect the crystallographic orientation. The grain size of upper foil is much smaller than that of the lower foil. And ultrasonic vibration results in a very weak texture with some characteristic intensity of a rotated cube-orientation and the Brass-orientation and S-orientation. In the lower foil, there is no much influence of the ultrasonic vibration. So there is very strong cube orientation in the lower foil. | Zhu Z Wynne B P Ghassemieh E Siddiq A | 2009 | 稀有金属材料与工程2009，38，A03： | 2 |
| 2 | Effects of Helicobacter pylori on proliferation of gastric epithelial cells in vitro 显示文摘 | Smoot DT Wynn Z EIliott TB | 1999 | Am J Gastroenterol1999，94，6： | 1 |
| 3 | Magnetic Structure Evolution in Mechanically Milled Nanostructured ZnFe2O4 Particles 显示文摘 | Jiang J Z Wynn P Morup S | 1999 | Nanostruct Mater1999，12，： | 1 |
| 4 | Ecological influences on larval chironomid communities in shallow lakes: implications for palaeolimnological interpretations 显示文摘 | Landgon PG Ruiz Z Wynne S Sayer CD Davidson TA | 2010 | Fresh Biol2010，55，3： | 1 |
| 5 | Estimating forest biomass usingsmall footprint LiD AR data:an individual tree-based approach thatincorporates training data显示文摘 | BORTOLOT Z J WYNNE R H | 2005 | ISPRS Journal of Photogrammetryand Remote Sensing2005，59，6： | 1 |
| 6 | Effects of Helicobacter pylori on proliferation of gastric epithelial cells in vitro显示文摘 | Smoot DT Wynn Z Elliott TB | | 0，，06： | 1 |
| 7 | Purinergic compo- nent of mechanosensory transduction is increased in a rat model of eolitis显示文摘 | WYNN G MA B RUAN H Z | 2004 | Am J Physiol Gastrointest Liver Physiol2004，287，： | 1 |
| 8 | Estimating forest biomass using small footprint LiDAR data: An individual tree-based approach that in- corporates training data 显示文摘 | Bortolot Z J Wynne R H | 2005 | Isprs Journal of Photogrammetry and Remote Sensing2005，59，6： | 1 |
| 9 | Effects of Helicobacter pylori on proliferation of gastric epithelial cells invitro 显示文摘 | Wynn Z Elliott TB Allen CR Mekasha G Naab T Ashktorab H | 1999 | Am J Gastroenterol1999，94，6： | 1 |
| 10 | Effect of feeding rumen- protected conjugated linoleic acid on carcass characteristics and fatty acid composition of sheep tissues显示文摘 | Wynn R J Daniel Z C T R Flux C L | 2006 | J anita sci2006，84，： | 1 |
| 11 | Comparative analysis of bat genomes provides insight into the evolution of flight and immunity 显示文摘 | Zhang G Cowled C Shi Z Huang Z Bishop-Lilly KA Fang X Wynne JW Xiong Z Baker ML Zhao W Tachedjian M Zhu Y Zhou P Jiang X Ng J Yang L Wu L Xiao J Feng Y Chen Y Sun X Zhang Y Marsh GA Crameri G Broder CC Frey KG Wang LF Wang J | 2013 | Science2013，339，6118： | 1 |
| 12 | Effect of feeding rumen-protected conjugated linoleic acid on carcass characteristics and fatty acid composition of sheep tissues显示文摘 | Wynn R J Daniel Z C T R Flux C L | 2006 | Journal of Animal Science2006，84，12： | 1 |
| 13 | RGS16 attenuates pulmonary Th2/Th17 inflammatory responses显示文摘 | Shankar SP Wilson MS DiVietro JA Mentink-Kane MM Xie Z Wynn TA Druey KM | | 0，，： | 1 |
| 14 | Through thickness, crystallographic texture of stationary shoulder friction stir welded aluminium显示文摘 | AHMED M M Z WYNNE B P RAINFORTH W M | 2011 | Scripta Materialia2011，64，1： | 1 |
| 15 | Through- thickness crystallographic texture of stationary shoulder friction stir welded aluminium显示文摘 | Ahmed M M Z Wynne B P Rairfforth W M | 2011 | Scripta Materialia2011，64，1： | 1 |
| 16 | Effect of feeding rumen-protected conjugated linoleic aci on carcass characteristics and fatty acid composition of sheep tissues显示文摘 | Wynn R J Daniel Z C T R Flux C L | | 0，，： | 1 |
| 17 | Purinergic component of mechanosensory transduction is increased in a rat model of colitis显示文摘 | Wynn G Ma B Ruan H Z Burnstock G | 2004 | Am J Physiol Gastrointest Liver Physiol2004，287，： | 1 |
| 18 | Effect of feeding rumen-protected conjugated linoleic acid on carcass characteristics and fatty acid composition of sheep tissues1,2 显示文摘 | Wynn R J Daniel Z C T R Flux C L | 2006 | Journal of Animal Science2006，84，12： | 1 |
| 19 | Through- thickness crystallographic texture of stationary shoulder friction stir welded aluminium显示文摘 | Ahmed M M Z Wynne B P Rainforth W M | 2011 | Scripta Materialia2011，64，1： | 1 |
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