TY - JOUR ID - TI - Retarding of Precipitation Hardening of Al-Cu Alloy by Cadimium Addition تأخیر عملیة التصلید بالترسیب لسبیكة (ألمنیوم – نحاس) بواسطة إضافة ألكادمیوم AU - Sabreen Ali AU - Alaa A. Atiyah AU - Amin D. Thamir PY - 2013 VL - 31 IS - 16 Part (A) Engineering SP - 2997 EP - 3006 JO - Engineering and Technology Journal مجلة الهندسة والتكنولوجيا SN - 16816900 24120758 AB - The aim of the present work is to prepare a set of Al-Cu alloys with slowprecipitation hardening by aging. Present work results can be utilized during theimporting or exporting of such alloys at solution treatment conditions. In order toestablish this aim, a set of Al-4%Cu alloys have been prepared in the laboratory toinvestigate the effect of Cd-addition with the percentage varied from (0.1, 0.3 and0.5) weight percentage. The prepared alloys with different Cd additions weresubjected to a natural aging up to 60 days after solution treatment. As a result, thealloys showed an obvious retarding in the aging kinetics as the percentage of Cdadditionsincreasing. This retarding was found to be due to the trapping of thevacancies that resulted during the quenching step that resulted in delays of Gunier-Preston zones precipitation. SEM has been used in monitoring of microstructure aswell as optical microscopy

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