Morphology of intermetallic compounds in Al-Si-Fe alloy and its control by ultrasonic vibration
Morphology of intermetallic compounds in Al-Si-Fe alloy and its control by ultrasonic vibration
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DOI：
10.2320/matertrans.f-mra2007874
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发表时间：
2007-09-01
影响因子：
1.2
通讯作者：
Kakisawa, Hideki
中科院分区：
文献类型：
--
作者：
Osawa, Yoshiaki;Takarnori, Susumu;Kakisawa, Hideki
铝合金中的铁杂质在凝固过程中形成粗大的针状金属间化合物，阻碍了回收过程。为了控制材料微观组织的形态，在凝固过程中对熔体施加超声波振动。对含铁质量分数为4%的铝硅铁合金进行了熔炼和凝固处理。熔体形成的初晶为金属间化合物Al3Fe、α-AlSiFe(Al7.4SiFe2)和β-AlSiFe(Al9Si2Fe2)。这些金属间化合物的提纯被认为是随着超声波振动的应用而发生的。在液相线温度下施加振动可以得到准确的结果。与15Si-4Fe合金类似，Al-6合金的相线温度在945~955K之间，而Al-18Si-4Fe合金的相线温度为977.2K。在Al-6ass%Si-4ass%Fe和Al-12ass%Si-4ass%Fe合金中形成了粗大的片状金属间化合物，利用超声振动过液相线温度冷却可以细化金属间化合物。将Al-18ass%Si-4ass%Fe合金由粗大的柱状晶组织转变为细晶组织。
Iron impurity in aluminum alloys forms coarse needle-shaped intermetallic compounds during solidification and hampers the recycling process. To control the morphology of the material microstructure, an experiment was carried out where ultrasonic vibration was applied to the melt during solidification. Aluminum-Silicon-Iron alloys containing 4 mass% iron were melted and solidified. The primary crystals that formed from the melts were intermetallic compounds that were identified as Al3Fe, alpha-AlSiFe (Al7.4SiFe2) and beta-AlSiFe (Al9Si2Fe2). The refinement of these intermetallic compounds was thought to occur with the application of ultrasonic vibration. Accurate results were obtained when the vibration was applied at the liquidus temperature. The liquidus temperatures of the Al-6 similar to 15Si-4Fe alloys were in the range of 945 to 955 K regardless of the silicon content and that of the Al-18Si-4Fe alloy was 977.2K. Coarse plate-like intermetallic compounds formed in Al-6mass%Si-4mass%Fe and Al-12mass%Si-4mass%Fe alloys, which can be refined by the application of ultrasonic vibration on crossing the liquidus temperature on cooling. The coarse columnar structure of an Al-18mass%Si-4mass%Fe alloy was modified to a fine grained structure.