Formation and Phase Selection of Iron-Rich Intermetallics in Al-4.6Cu-0.5Fe Cast Alloys
Formation and Phase Selection of Iron-Rich Intermetallics in Al-4.6Cu-0.5Fe Cast Alloys
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DOI：
10.1007/s11661-012-1419-7
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发表时间：
2013-02
期刊：
影响因子：
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通讯作者：
Kai Liu;X. Cao;X.-Grant Chen
中科院分区：
文献类型：
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作者：
Kai Liu;X. Cao;X.-Grant Chen
采用差示扫描量热仪、电子背散射衍射仪和透射电镜等方法对Al-Cu 206铸造合金在高铁含量（0.5%）下的凝固组织进行了系统研究。建立了206铸造合金在0.5%Fe下的完全凝固顺序。两种合金成分（即，系统地研究了不同的Si、Mn含量和冷却速度对富铁金属间化合物的形成和相选择的影响。在12 K/min的冷却速率下，发现三个富铁相之一，即，汉字Alm（FeMn）和α-Fe或片状Al 3（FeMn）可作为主要的富铁金属间化合物沉淀，这取决于Si和Mn的含量。然而，在正常工业铸造条件下，当Fe含量高于临界冷却速率0.5%时，206 Al-Cu铸造合金可完全获得占主导地位的汉字富铁金属间化合物Alm（FeMn）和/或α-Fe，这表明设计和开发具有高容限铁含量的新型206 Al-Cu铸造合金具有很大的潜力。
The solidification structures of Al-Cu 206 cast alloys at a high iron level of 0.5 pct were systematically studied by means of differential scanning calorimetry, electron backscattered diffraction, and transmission electron microscopy. The full solidification sequences of the 206 cast alloys at 0.5 pct Fe were established. The influences of both alloy composition (i.e., Si and Mn contents) and cooling rate on the formation and phase selection of the iron-rich intermetallics have been systematically explored. At a cooling rate of 12 K/min, it was found that one of the three iron-rich phases,i.e., Chinese script Alm(FeMn) and α-Fe, or platelet Al3(FeMn), may precipitate as the dominant iron-rich intermetallic, depending on Si and Mn contents. However, the dominant Chinese script iron-rich intermetallics, Alm(FeMn) and/or α-Fe, can be fully obtained for the 206 Al-Cu cast alloys at 0.5 pct Fe above a threshold cooling rate that can easily be obtained in normal industrial casting conditions, indicating that there is a significant potential of designing and developing new 206 Al-Cu cast alloys with a high tolerant iron content.