The effect of silver content on the precipitation of the Al-4.6Cu-0.3Mg alloy

Chih Horng Chang, Sheng Long Lee, Jing Chie Lin, Rong Ruey Jeng

研究成果: 雜誌貢獻期刊論文同行評審

16 引文 斯高帕斯(Scopus)


The effect of Ag concentrations of up to 0.9mass% on the precipitation of the strengthening phases in Al-4.6Cu-0.3Mg casting alloy were investigated. Microstructural features were elucidated by optical microscopy, electron probe X-ray microanalysis, measurement of electrical conductivity and differential scanning calorimetry. The microstructure was correlated with Rockwell hardness. The results revealed that the addition of Ag at a concentration of under 0.6 mass% promoted the precipitation of the Ω and θ′ phases and the augmentation of hardness of T7 tempered alloys. 0.9 mass% Ag caused the extensive precipitation of the Ω phase, but only mildly suppressed the precipitation of the θ′ phase, slightly increasing the hardness. The high density of the precipitates of the Ω phase is responsible for the excellent thermal stability and mechanical properties of the microstructure. The Ω precipitates out before the θ′ phase, and does so more quickly, during the aging process.

頁(從 - 到)236-240
期刊Materials Transactions
出版狀態已出版 - 2月 2005


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