| In the present study, we made an attempt to fabricate a nitride-reinforced Al alloy composite by blowing N₂gas into Al alloy melts. The addition of reactive element Mg to Al alloy melt facilitated the nitriding reaction, leading to the formation of TiN in Al-5wt.%Ti-10wt.%Mg alloy, but rarely formed in Al-5wt.%Ti alloy due to the absence of Mg. The former alloy showed higher room temperature tensile strength as compared with the latter alloy, which is mainly due to the presence of TiN and partly due to solid solution strengthening effects of Mg. In addition, it is considered that the presence of nitride may also be responsible for high temperature strengthening, judging from the lower decreasing rate of tensile strength with temperature in Al-5wt.%Ti-10wt.%Mg alloy. |
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