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| 1 | Effects of process parameters on semi-solid squeeze casting performance of aluminum alloy scrolls for scroll compressors显示文摘The aluminum alloy scroll is one of the key parts of the scroll compressors widely used in the air-conditioning,refrigeration,and heat pump systems.In this work,the semi-solid squeeze casting(SSSC)process was used to fabricate the aluminum alloy scroll.The effects of process parameters including the pouring temperature,mold temperature,and squeezing velocity on the filling and solidification behaviors of the alloys were investigated through simulations based on the power law cut-off(PLCO)material model.Results show that there is a significant increase in the flow velocity of the slurry,and the area of the high-speed region enlarges with the increase of the pouring temperature.The homogeneity of the temperature and velocity fields in the slurry is improved with an increase in mold temperature.Both the filling time and its variation rate decrease with an increase in squeezing velocity.The maximum solidification time exhibits a linear variation with the increase in pouring temperature.The shrinkage area is decreased by increasing the mold temperature.The optimal process parameters of the SSSC process were obtained from simulation analysis,which are the pouring temperature of 595°C,mold temperature of 350°C,and squeezing velocity of 0.3 m·s-1.Moreover,the qualified scroll casting was fabricated using the SSSC process under the optimal process parameters. | Yong-fei Wang Sheng-dun Zhao Yi Guo Jun-ling Yang | 2020 | China Foundry2020，17，5： | 3 |
| 2 | Microstructure evolution of TiB_(2) particle-reinforced 7075 Al alloy slurry in semisolid state with different holding time显示文摘TiB_2particle-reinforced 7075 Al alloy was synthesized to investigate the effect of TiB_2 particles on microstructure of semisolid 7075 Al alloy slurry. The mean grain size and shape factor of 3 wt% TiB_2/7075 composite could reach 92 lm and 0.64 at 630 °C for 23 min,respectively, and for 6 wt% TiB_2/7075 composite, they are100 lm and 0.64 at 630 °C for 33 min. The microstructure evolution for TiB_2/7075 composites in semisolid state includes three-stage process. a-Al begins to nucleate and grow up into rosette grains due to a low degree of supercooling at ?rst. Then rosette grains begin to fuse or grow up at different rates. Finally, the dissolution rate and the growth rate of α-Al reach equilibrium. | Gui-Sheng Gan Bin Yang | 2016 | Rare Metals2016，35，11： | 0 |
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