| 1 | Influence of Interfacial Bonding between Metal Droplets on Tensile Properties of 7075 Aluminum Billets by Additive Manufacturing Technique显示文摘7075 aluminum billets were fabricated by micro droplet deposition manufacturing technique,and the influence of interfacial bonding between metal droplets on the tensile properties was studied.Three sets of samples were manufactured under different temperature conditions,and their mechanical properties were compared.The results show that the temperature of the metal droplets and substrate signi?cantly affect the tensile strength of the sample.Moreover,with proper temperature setting,the 7075 aluminum billets manufactured by micro metal droplet deposition could achieve very good mechanical properties with a tensile strength of 373 MPa and an elongation of 9.95%,which are very similar to those of an extruded sample.Moreover,a metallurgical bonding diagram based on numerical calculations of interfacial temperature was established to predict the interfacial bonding state.In addition,the fracture morphologies of these specimens were observed.It is indicated that there was a signi?cant transformation of failure mechanism with the improvement of metallurgical bonding,which agreed well with the numerical results. | Hansong Zuo Hejun Li Lehua Qi Songyi Zhong | 2016 | Journal of Materials Science & Technology2016，32，5： | 6 |
| 2 | Snow resisting capacity of Caragana microphylla and Achnatherum splendens in a typical steppe region of Inner Mongolia,China显示文摘Snow resisting capacity of vegetation is important for secondary distribution of water resources in seasonal snow areas of grassland because it affects the regeneration,growth and nutrient circulation of vegetation in grassland.This study investigated vegetation characteristics(canopy height,canopy length and crown width)of Caragana microphylla Lam.(shrub)and Achnatherum splendens(Trin.)Nevski.(herb),and snow morphologies(snow depth,snow width and snow braid length)in a typical steppe region of Inner Mongolia,China in 2017.And the influence of vegetation characteristic on snow resisting capacity(the indices of bottom area of snow and snow volume reflect snow resisting capacity)was analyzed.The results showed that snow morphology depends on vegetation characteristics of shrub and herb.The canopy height was found to have the greatest influence on snow depth and the crown width had the greatest influence on snow width.The canopy length was found to have little influence on morphological parameters of snow.When the windward areas of C.microphylla and A.splendens were within the ranges of 0.0-0.5 m2 and 0.0-8.0 m2,respectively,the variation of snow cover was large;however,beyond these areas,the variation of snow cover became gradually stable.The potential area of snow retardation for a single plant was 1.5-2.5 m2 and the amount of snow resistance was 0.15-0.20 m3.The bottom area of snow and snow volume(i.e.,snow resisting capacity)of clumped C.microphylla and A.splendens was found to be 4 and 25 times that of individual plant,respectively.The results could provide a theoretical basis both for the estimation of snow cover and the establishment of a plant-based technical system for the control of windblown snow in the typical steppe region of Inner Mongolia. | YAN Min ZUO Hejun WANG Haibing DONG Zhi LI Gangtie | 2020 | Journal of Arid Land2020，12，2： | 1 |
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