摘要
The effects of Ag,Co,and Ge additions on microstructure and mechanical properties of Be-35Al(wt.%)alloys fabricated by investment casting were studied.The results reveal that the trace metals 1.5wt.%Ag,0.7wt.%Co,and 0.8wt.%Ge additions do not change the nucleation temperature of Be phase.However,the nucleation temperature of the Al phase decreases from 642℃ to 630℃ by DSC due to the Ge addition.The strength of the alloys sharply increases due to the dissolution of the Ag and Ge solutes into the Al phase and the Co into the Be phase characterized by SEM and EDS.Obviously,the strength of Be-Al-Ag-Co-Ge alloy is improved by the solution strengthening.Furthermore,a few Ag_(3) Al particles contribute to the strength of the Al phase.Be-Fe-Al ternary intermetallic compounds which can effectively reduce the negative effect of an impurity element Fe on the mechanical properties of Be-Al alloys are also found by XRD and EDS.
基金
supported by the State Key Laboratory of Special Rare Metal Materials (Contract No. SKL2018K004)
China Nonferrous Metal Mining (Group) Co.,Ltd.,Science and Technology Planning Projects (2018KJJH02, 2020KJJH04)
the Central Government Directs Special Projects for the Development of Local Science and Technology (2020)
Ningxia Hui Autonomous Region Industrial Innovation List Unwrapping Project (20200108)
