期刊
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
卷 25, 期 11, 页码 3553-3559出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S1003-6326(15)63998-X
关键词
Al-Cu alloy; sodium; grain boundaries; fracture; mechanical performance
Plentiful sodium was introduced into the alloy using salt fluxes as medium, then the existing form and influence of sodium on the microstructure and tensile properties of Al-4.5%Cu (mass fraction) alloy were investigated. It is proved that the elemental sodium segregates at the grain boundaries of Al-4.5%Cu alloy and weakens the bond between the matrix and CuAl2-phase. After T6 heat treatment, sodium results in micro-fracture and induces the residual of CuAl2-phase in Al-4.5%Cu alloy. The tensile test results show that the sodium causes a transition from dimple fracture to intergranular fracture, which makes the mechanical performance of Al-4.5%Cu decrease dramatically.
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