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第十届中俄双边新材料新工艺研讨会

作者： qi wenjun,zheng feiyan,and wang shuncheng guangzhou research institute of non-ferrous metals,guangzhou 510651,china

The effect of Si,Ca addition on microstructures and elevated temperature(150℃) properties of as cast magnesium alloys were *** results show that the microstructures of as cast alloys with addition of Si,Ca are refined and a kind of new phase, MgSi,is formed 0.24%Si and 0.081%Ca was added to refine *** Si,Ca elements can improve the elevated temperature mechanical properties of the investigated *** ultimate tensile strength and elongation at 150℃of AZ91-0.24Si alloys were 102 MPa, that has increased 40%than *** the addition of 0.081%Ca,the ultimate tensile strength and elongation at 150℃.were increased to 117.7 MPa and 2.1%,*** high temperature creep resistant properties(150℃,50 MPa,100 h) of alloy was evidently improved by added Si,Ca *** improvement of elevated temperature mechanical properties are as a result of the crystal boundary strength of the MgSi phase functionary.

关键词： magnesium alloy AZ91 Si Ca elevated temperature properties

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Production of A356 aluminum alloy wheels by thixo-forging combined with a low superheat casting process

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china Foundry 2013年第5期10卷 299-303页

作者： wang shuncheng Cai Chang zheng Kaihong qi wenjun institute of Metal Processing Forming Technology Guangdong General Research Institute of Industrial Technology

The A356 aluminum alloy wheels were produced by thixo-forging combined with a low superheat casting process. The as-cast microstructure, microstructure evolution during reheating and the mechanical properties of thixo-forged wheels made from the A356 aluminum alloy were studied. The results show that the A356 aluminum alloy round billet with fine, uniform and non-dendritic grains can be obtained when the melt is cast at 635 ℃ When the round billet is reheated at 600 ℃ for 60 min, the non-dendritic grains are changed into spherical ones and the round billet can be easily thixo-forged into wheels. The tensile strength, yield strength and elongation of the thixo-forged wheels with T6 heat treatment are 327.6 MPa, 228.3 MPa and 7.8%, respectively, which are higher than those of a cast wheel. It is suggested that the thixo-forging combined with the low superheat casting process is an effective technique to produce aluminum alloy wheels with high mechanical properties.

关键词： semisolid metal thixo-forging low superheat casting aluminum alloy wheel

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