Evolution of primary phases and high-temperature compressive behaviors of as-cast AuSn20 alloys prepared by different solidification pathways
Evolution of primary phases and high-temperature compressive behaviors of as-cast AuSn20 alloys prepared by different solidification pathways
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DOI：
10.1007/s13404-011-0004-y
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发表时间：
2011-02
期刊：
影响因子：
2.2
通讯作者：
Qingbiao Tan;C. Deng;Y. Mao;G. He
中科院分区：
文献类型：
--
作者：
Qingbiao Tan;C. Deng;Y. Mao;G. He
研究了四种不同凝固方式制备的AuSn 20共晶合金的铸态组织和高温压缩行为。四种合金中出现的初生相对冷却速度非常敏感，其尺寸和体积分数均随冷却速度的增加而减小。在低冷速下，初生α ′-Au5 Sn相为枝晶状，在高冷速下，初生α ′-Au5 Sn相转变为玫瑰花状。当冷却速率为3.5 × 104 K/min时，初生α ′-Au_5Sn相被抑制，而以小的δ-AuSn颗粒为主相。对于通过用铜坩埚注射铸造制备的合金，在220°C下的压缩行为表现出低屈服应力和长应力平台，这表明用于生产AuSn 20条或箔的有利加工路线。
The as-cast AuSn20 eutectic alloys prepared by four different solidification pathways have been investigated in terms of the microstructure and the high-temperature compressive behaviors. The primary phases appeared in the four alloys are very sensitive to the cooling rate, which decrease in the size and the volume fraction as the cooling rate increases. The morphologies of the primary ζ′-Au5Sn phase are in dendritic at low cooling rate and change to rosette-like at high cooling rate. When the cooling rate is about 3.5 × 104K/min, the primary ζ′-Au5Sn can be suppressed but small δ-AuSn particles appear instead as the primary phase. The compressive behaviors at 220°C exhibit a low yielding stress and a long stress platform for the alloy prepared by injection casting with a copper crucible, which indicates an advantageous processing route for the production of the AuSn20 strips or foils.