用固相合成的方法合成磷酸硅铝(S iA lPO4)类化合物,所得化合物在聚乙二醇辛基苯基醚及聚乙烯醇存在下铝(III)与铬天青S的显色反应.在pH 5.3的HAc-NaAc缓冲介质中,体系最大吸收波长λm ax=612nm,用分光光度法测定磷酸硅铝类化合物中铝,...用固相合成的方法合成磷酸硅铝(S iA lPO4)类化合物,所得化合物在聚乙二醇辛基苯基醚及聚乙烯醇存在下铝(III)与铬天青S的显色反应.在pH 5.3的HAc-NaAc缓冲介质中,体系最大吸收波长λm ax=612nm,用分光光度法测定磷酸硅铝类化合物中铝,实验结果与理论计算结果基本一致.展开更多
The differences in the microstructure and elevated temperature tensile properties of gravity die cast,squeeze cast,and semi-solid thixoformed Al-Si-Cu-Mn-Fe alloys after thermal exposure at 300℃were discussed.The res...The differences in the microstructure and elevated temperature tensile properties of gravity die cast,squeeze cast,and semi-solid thixoformed Al-Si-Cu-Mn-Fe alloys after thermal exposure at 300℃were discussed.The results demonstrate that the elevated temperature tensile properties of semi-solid thixoformed alloys were significantly higher than those of gravity die cast and squeeze cast alloys,especially after thermal exposure for 100 h.The ultimate tensile strength(UTS)of semi-solid thixoformed alloys after thermal exposure at 300℃for 0.5,10 and 100 h were 181,122 and 110 MPa,respectively.The UTS values of semi-solid thixoformed alloys were higher than those of heat resistant aluminum alloys used in commercial applications.The enhanced elevated temperature tensile properties of semi-solid thixoformed experimental alloys after thermal exposure can be attributed to the combined reinforcement of precipitation strengthening and grain boundary strengthening due to thermally stable intermetallic phases as well as suitable grain size.展开更多
基金financially supported by the National Natural Science Foundation of China(Nos.51704084,52074131)the Science and Technology Plan of Guizhou Province,China(Nos.ZK2021(267),ZK2021(067))the Cultivation Project of Guizhou University,China(No.2019(23))。
文摘The differences in the microstructure and elevated temperature tensile properties of gravity die cast,squeeze cast,and semi-solid thixoformed Al-Si-Cu-Mn-Fe alloys after thermal exposure at 300℃were discussed.The results demonstrate that the elevated temperature tensile properties of semi-solid thixoformed alloys were significantly higher than those of gravity die cast and squeeze cast alloys,especially after thermal exposure for 100 h.The ultimate tensile strength(UTS)of semi-solid thixoformed alloys after thermal exposure at 300℃for 0.5,10 and 100 h were 181,122 and 110 MPa,respectively.The UTS values of semi-solid thixoformed alloys were higher than those of heat resistant aluminum alloys used in commercial applications.The enhanced elevated temperature tensile properties of semi-solid thixoformed experimental alloys after thermal exposure can be attributed to the combined reinforcement of precipitation strengthening and grain boundary strengthening due to thermally stable intermetallic phases as well as suitable grain size.
