Effect of Ce on the thermal stability of the Ω phase in an Al-Cu-Mg-Ag alloy
来源期刊：Rare Metals2009年第2期
论文作者：SONG Min,XIAO Daihong,and ZHANG Fuqin State Key Laboratory of Powder Metallurgy,Central South University,Changsha ,China
文章页码：156 - 159
摘 要：This paper studies the effect of Ce on the thermal stability of the Ω phase in an Al-Cu-Mg-Ag alloy by TEM and tensile testing. It has been shown that Ce substantially increases the nucleation density of the Ω phase by acting as the heterogeneous nucleation center. Most impor-tantly,Ce improves the thermal stability of the Ω phase by decreasing the diffusion velocity of Cu atoms and increasing the energy barrier of the thickening ledge nucleation,thus improving the strength of the Al-Cu-Mg-Ag alloy at both room-and elevated-temperatures.
摘要：This paper studies the effect of Ce on the thermal stability of the Ω phase in an Al-Cu-Mg-Ag alloy by TEM and tensile testing. It has been shown that Ce substantially increases the nucleation density of the Ω phase by acting as the heterogeneous nucleation center. Most impor-tantly,Ce improves the thermal stability of the Ω phase by decreasing the diffusion velocity of Cu atoms and increasing the energy barrier of the thickening ledge nucleation,thus improving the strength of the Al-Cu-Mg-Ag alloy at both room-and elevated-temperatures.
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