Al_(0.5)FeNiCr和Al_(0.5)FeNiCrCoTi_(0.25)合金高温铝液熔蚀行为

Corrosion behaviors of Al_(0.5)FeNiCr and Al_(0.5)FeNiCrCoTi_(0.25) alloys in molten aluminum

采用电弧熔炼法制备了Al_(0.5)FeNiCr和Al_(0.5)FeNiCoCrTi_(0.25)两种合金,并在700℃铝液中放置1 h,研究其熔蚀行为。Al_(0.5)FeNiCr合金在熔蚀过程中主要生成单一的熔蚀反应层(厚约17μm),且反应层邻近铝的表面疏松,合金元素与Al生成不同的化合物,不断剥落并游离到铝液中;而Al_(0.5)FeNiCoCrTi_(0.25)合金则主要表现为元素与Al反应、扩散,生成两层致密的反应层,反应层由靠近基体Al_(0.5)FeNiCoCrTi_(0.25)合金的较薄的反应层Ⅰ(厚约11μm)及靠近Al的较厚反应层Ⅱ(厚约33μm)组成,并且无明显的剥落生成物。

Al0.5FeNiCr and Al0.5FeNiCrCoTi0.25 alloys were prepared by vacuum induction arc-melting, and the two alloys were placed in pure A1 melt at 700 ℃ for 1 hour, aiming to investigate their corrosion behaviors. Only one single intercalation layer （a- bout 17μm thick） with loose surface which was adjacent to AI melt between Al0.5FeNiCr alloy and molten aluminum was ob served in Al0.5FeNiCr. Meanwhile, compounds produced by corrosion reaction between molten aluminum and alloy elements of A10.s FeNiCr spalled constantly from the intercalation layer and then dissociated into A1 melt. However, there were no evident compounds that were generated in Al0.5FeNiCrCoTi0.25, in contrast, two dense intercalation layers produced by corrosion reaction between molten aluminum and alloy elements of Al0.5FeNiCrCoTi0.25 were visible： the intercalation layer I which was adjacent to Al0.5FeNiCrCoTi0.25 matrix was approximately 11 μm thick, and the intercalation layer II was about 33μm thick, adjacent to Al melt. The results may provide theoretical basis of these new corrosion-resistant materials in molten aluminum.