By Bondan Tiara Sofyan
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Extra info for Advanced Materials Research QiR 12
Consequently, adding Mg content caused better interface properties, indicating a reduction of void existences. 31 % Mg. V shows void at the interface. 75 % Cu is presented in Fig. 2. It shows that decreasing the Cu content reduces void existences. This condition results from the decrease castability as the Cu content increases . 75 % Cu. V shows void at the interface. The steel wire reinforcement produces an intermetallic phase of Fe-Al-Si. This condition is achieved by the high affinity between aluminium and ferrous ions; therefore, physical-chemical interface reactions develop rapidly at the interface between the aluminium liquid and the wire solid.
15]. The increase of hardness with SiC content is to be expected as SiC is significantly harder than Al. In addition the region of increased hardness had reduced porosity; again this is to be expected. Bondan Tiara Sofyan 25 a b Figure 7 : Hardness is not uniform from bottom to the top of samples (a) and b) hardnes is as a function of the percentage of Si external doped system in pure Al/SiC MMC’s after pressureless infiltration at 900oC for 1 hour and grey bar is for Al-Si based alloy internal doped system.
8. The hardness of pure Al external doped with 1wt%Mg mixed with Si is slightly lower than Al alloy. Therefore although pressureless infiltration can be initiated both with external dopant and internal dopant for high volume fraction of SiC the process always results in a new phase and corresponding variation in the resultant properties. 26 Advanced Materials Research QiR 12 Conclusion: 1. The Si powder as an external dopant can iniate and maintain pressureless infiltration of pure Al into SiC preform under a nitrogenous atmosphere.