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您的检索式：作者名="Huasheng MEI"
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| 1 | Morphology observation for surface orange peel and fracture in tension sample of aluminum-alloy sheet and characterization of nano hardness显示文摘The tension property of aluminum-alloy sheet with different microstructures is measured,and the surface and tension fracture morphology of tension sample with and without orange peel are observed by using scanning electron microscope(SEM).Surface roughness and nano hardness of tension sample are measured.The results show that the average elongation of the samples with orange peel is lower than that without orange peel;especially the r value of perpendicular to the rolling direction is much lower than that without orange peel.The tension surface of the orange peel samples is very rough;various parameters of surface roughness are higher.Under the observation of SEM,a wider sliding band with a micro crack on the surface of orange peel sample can be found.The various parameters of surface roughness without orange peel sample are near to zero,the sliding band is narrow and without micro cracks.The dimple width in tensile fracture of orange peel sample is larger than that without orange peel sample,but shear lip is narrower.The nano hardness testing results show that samples with orange peel behave high elastic modulus,high hardness,and high maximum load,but low plastic deformation depth.These mentioned features can completely describe surface and fracture morphology of tension samples with orange peel. | Ma Mingtu Mei Huasheng Lu Hongzhou Yang Hongya Wu Emei Zhou Mingbo | 2012 | Engineering Sciences2012，10，6： | 4 |
| 2 | Microstructure Evolution and Grain Coarsening Behaviour During Partial Remelting of Cyclic Extrusion Compression Formed AZ61 Magnesium Alloy显示文摘The effects of CEC passes, isothermal holding time and reheating temperature on the microstructure evolution and grain coarsening behaviour of AZ61 magnesium alloy produced by the recrystallisation and partialmelting (RAP) process were investigated. Before partial remelting, as-cast AZ61 alloy was deformed by cyclic extrusion compression (CEC) with one pass and two pass at 330℃. After CEC, the microstructure consisted of unrecrystallized grains and deformed eutectic compounds. Increasing isothermal holding time resulted in the formation of spheroidal grains surrounded by liquid films. With increasing the isothermal holding time, the solid grain size increased and the degree of spheroidization was improved. With increasing the reheating temperature, namely increasing liquid fraction, the solid grain size obviously decreased during the period from 560℃ to 570℃ and then slightly increased after 570℃, while the shape factor increased monotonously. During partial remelting, increasing reheating temperature can properly short the isothermal holding time to obtain fine structure. Moreover, increasing the numbers of CEC passes could produce finer semi-solid mi- crostructure. The coarsening behavior of solid grains in the semi-solid state obeys Ostwald ripening and grain coalescence mechanisms. The coarsening rate constant, K, was 80 μm3 · s-1 for samples partially remelted at 595℃. After CEC plus partial remelting, the ideal and fine semi-solid state structure can be obtained, which was suitable for thixoforming. | Changpeng WANG Huasheng MEI Rongqiang LI Difan LI Ling WANG Jie LIU Zehui HUA Lijin ZHAO Feifei PEN Hui LI | 2013 | Acta Metallurgica Sinica(English Letters)2013，26，2： | 1 |
| 3 | The influence of drain- age on wetland degradation in zoige piateau 显示文摘 | LI Mei Li Lianxia Liao Huasheng | 2012 | Disaster Ad- vances2012，5，4： | 1 |
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